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HARDWARE TECHNICAL REFERENCE
LS Pro
apricot
MITSUBISHI ELECTRIC

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Table of Contents

   Summary of Contents for Mitsubishi Electric LS Pro

  • Page 1 HARDWARE TECHNICAL REFERENCE LS Pro apricot MITSUBISHI ELECTRIC...
  • Page 2 HARDWARE TECHNICAL REFERENCE...
  • Page 3 Information contained in this document is subject to change without notice and does not represent a commitment on the part of Apricot Computers Limited. The software described in this manual is furnished under a license agreement. The software may be used or copied only in accordance with the terms of this agreement.
  • Page 4 All computers in the Apricot LS Pro range are covered. The manual is divided into a number of sections and appendices as described below: 1. Introduction This is a brief overview of the Apricot LS Pro which describes the options and major components of the system. 2. System Unit This section describes the system unit: it also includes disassembly instructions for servicing and replacing major components of the system.
  • Page 5 8237 DMA controller 8254 System timers 8259 Interrupt controllers 82596 Ethernet coprocessor VLSI VL82C311 (SCAMP) AT chipset Cyrix 486SLC Cirrus CL-GD542X video controller National Semiconductor NS16450 Serial communications controller Hitachi MC146818 Real time clock 2 LS PRO HARDWARE TECHNICAL REFERENCE...
  • Page 6 CONTENTS...
  • Page 7: Table Of Contents

    General ........3/15 Quantum ProDrive Drive formats ......3/15 LPS240AT ......... 4/12 3.7 Hard disk interface ... 3/16 Quantum ProDrive General ........3/16 LPS525AT ......... 4/13 Interface signal descriptions . 3/16 IDE interface ......4/14 LS PRO HARDWARE TECHNICAL REFERENCE 1...
  • Page 8 Business audio ......5/17 Floppy disk controller ... 5/17 Parallel port controller ..5/18 Video DAC ......5/19 VGA registers ......5/20 CL-GD542X Extension registers ........5/25 APPENDICES Specifications Revision C system board Error beep codes INDEX 2 LS PRO HARDWARE TECHNICAL REFERENCE...
  • Page 9: Introduction

    INTRODUCTION Chapter 1...
  • Page 10 Introduction Contents INTRODUCTION General ........1/2 Keyboard ........1/3 Variants ........1/2 Monitors ........1/3 System unit ......... 1/3 Expansion ........1/4 LS PRO HARDWARE TECHNICAL REFERENCE 1/1...
  • Page 11: General

    Introduction General The Apricot LS Pro family is a range of ultra-compact IBM compatible computers which can be used as a personal computer, a network workstation or a high resolution graphics workstation. The main features of the system are: • 80386SX or 486SLC microprocessor operating at up to 33MHz.
  • Page 12: System Unit

    The on-board VGA controller also supports high resolution video modes. To take advantage of the higher resolution video modes an SVGA or EVGA monitor must be used. Video drivers for popular software packages are available. LS PRO HARDWARE TECHNICAL REFERENCE 1/3...
  • Page 13: Expansion

    PROCESSOR; MEMORY; VIDEO ADAPTER ETHERNET CONTROLLER; SERIAL PORT PARALLEL PORT; LOC TECHNOLOGY SECURITY FLOPPY DISK CONTROLLER; HARD DISK CONNECTOR; KEYBOARD AND MOUSE PORTS; HARD DISK DRIVE BUSINESS AUDIO. FLOPPY DISK DRIVE KEYBOARD MOUSE 1/4 LS PRO HARDWARE TECHNICAL REFERENCE...
  • Page 14 SYSTEM UNIT Chapter 2...
  • Page 15 .......... 2/9 Ethernet ........ 2/20 Removing the fan ....2/10 Serial port ......2/21 Removing the power Parallel port ......2/22 supply ........2/11 Keyboard/mouse Removing a Token-Ring connectors ......2/22 module ........2/11 LS PRO HARDWARE TECHNICAL REFERENCE 2/1...
  • Page 16: External Layout

    PAIR ETHERNET LOCK VIDEO THIN PORT ETHERNET THICK SERIAL POWER PORT ETHERNET/ PORT TOKEN RING PORT Illustrations and pinouts of the connectors on the rear panel are given at the rear of this section. 2/2 LS PRO HARDWARE TECHNICAL REFERENCE...
  • Page 17: Internal Layout

    Dismantling and re-assembly The LS Pro range has been designed to meet international EMI and safety standards. Warnings and To ensure safety and continued compliance with these standards, observe the cautions following precautions.
  • Page 18: Antistatic Precautions

    Connector Label Parallel port Token ring module PL9 and PL16 Hard disk drive power PL12 Thick Ethernet PL13 System board power PL15 Hard disk drive control PL17 Floppy disk drive PL18 Loudspeaker PL40 2/4 LS PRO HARDWARE TECHNICAL REFERENCE...
  • Page 19: Removing The System Unit Top Cover

    The cover is located by a ledge at top cover the front and lugs on the sides and at the rear. Two thumbscrews in the rear panel secure the cover. LS PRO HARDWARE TECHNICAL REFERENCE 2/5...
  • Page 20: Removing The System Board Metalwork

    SECURING LUGS SECURING CLIPS 1. Remove the system unit top cover. 2. Release the two retaining latches. On releasing the latches, the system board metalwork will spring up slightly. 2/6 LS PRO HARDWARE TECHNICAL REFERENCE...
  • Page 21: Removing The Floppy Drive

    LEDs. Removing the The floppy drive is mounted in the metalwork above the system board. floppy drive Two variants of metalwork have been used, they are both shown in the illustration below. LS PRO HARDWARE TECHNICAL REFERENCE 2/7...
  • Page 22: Removing The Power Supply Metalwork

    5. An earth cable connects the power supply to the metalwork. Gently lift the metalwork and carefully turn it over. 6. Remove the screw which secures the cable to the metalwork and lift the metalwork clear. 2/8 LS PRO HARDWARE TECHNICAL REFERENCE...
  • Page 23: Removing The Hard Disk Drive

    2. Disconnect the hard disk drive power and signal cables from the system board. Warning Do not attempt to disconnect the cables from the drive with the drive still in the system unit. Attempting to do so will damage the drive circuit board. LS PRO HARDWARE TECHNICAL REFERENCE 2/9...
  • Page 24 4. Replacement is simply the reverse of removal. Make sure that you replace the fan in the same orientation as it was before removal, and that the fan power cable is secured to the fan with a cable tie. 2/10 LS PRO HARDWARE TECHNICAL REFERENCE...
  • Page 25: Removing The Power Supply

    1. Remove the system board metalwork. 2. Remove the screw in the rear panel of the system unit, to the right of the Token- Ring connector. TOKEN RING CONNECTOR SECURING SCREW LS PRO HARDWARE TECHNICAL REFERENCE 2/11...
  • Page 26 Check that the connectors are correctly aligned, then gently insert the module. Warning Take care not to exert undue pressure when inserting the module. 2/12 LS PRO HARDWARE TECHNICAL REFERENCE...
  • Page 27: Removing A Parallel Port Cable

    4. Remove the seven screws which secure the system board. 5. Remove the screwlocks that secure the video and serial port connectors. 6. Remove the lock nut on the thin Ethernet connector. 7. Carefully lift the system board clear of the system unit. LS PRO HARDWARE TECHNICAL REFERENCE 2/13...
  • Page 28: Removing An Escutcheon Plate

    1. Remove the system unit top cover, system board metalwork, hard disk drive, power supply metalwork, fan, power supply and system board. Warning During the following instructions do not apply excessive pressure or the linkage may be deformed or the plastics break. 2/14 LS PRO HARDWARE TECHNICAL REFERENCE...
  • Page 29 Do not force the linkage into place. RFI screening tray The LS Pro system unit base is fitted with a metal RFI screening tray and a plastic and insulation insulation sheet during manufacture.
  • Page 30: Installing Add-ons

    RAM is to install an 8 Mbyte upgrade in bank 2 and leave the other bank (or banks) empty. This configuration disables the RAM soldered to the system board. 2. When banks 2 and 3 are both occupied by 8 Mbyte upgrades the RAM soldered to the system board is disabled. 2/16 LS PRO HARDWARE TECHNICAL REFERENCE...
  • Page 31 2. Taking care to avoid touching any of the components on the SIMM grip the top corners of the SIMM between thumb and first finger and carefully pull the SIMM out of the socket. 3. Repeat steps 1 and 2 for the other SIMM(s) affected. LS PRO HARDWARE TECHNICAL REFERENCE 2/17...
  • Page 32 7. Rotate the SIMM into the vertical position by pushing gently on the top corners. 8. If the SIMM is properly located the SIMM should remain in position held by the securing clips, and with a small plastic lug through the holes on either side of the SIMM. 2/18 LS PRO HARDWARE TECHNICAL REFERENCE...
  • Page 33: Installing An 80387sx

    80387SX in the socket with the positioning guide at pin 1 making sure that you do not bend or otherwise damage the pins. Note The 80387SX only fits in one orientation. Do not use excessive force or damage may occur. 5. Reassemble the system. LS PRO HARDWARE TECHNICAL REFERENCE 2/19...
  • Page 34: System Unit Connectors

    Signal Collision presence shield Collision presence (+ve) Transmit (+ve) Receive shield Receive (+ve) Power return Reserved (+ve) Reserved shield Collision presence (-ve) Transmit (-ve) Transmit shield Receive (-ve) Power Power shield Reserved (-ve) 2/20 LS PRO HARDWARE TECHNICAL REFERENCE...
  • Page 35 Transmit data (COM2) Receive data (COM2) Request to send (COM2) Data terminal ready (COM1) Ring indicate(COM1) All other pins are not connected. Note The Rev C system board does not provide the COM2 signals. LS PRO HARDWARE TECHNICAL REFERENCE 2/21...
  • Page 36: Keyboard/mouse Connectors

    Data bit 6 Ground Data bit 7 Ground Ack- Ground Busy Ground Ground SLCT Keyboard/mouse The keyboard and mouse connectors are miniature 6-pin connectors DIN connectors. Signal name Data Reserved Ground +5Vdc Clock Reserved 2/22 LS PRO HARDWARE TECHNICAL REFERENCE...
  • Page 37: System Board

    SYSTEM BOARD Chapter 3...
  • Page 38 (RAM) ........3/10 System board power Real time clock (RTC)RAM . 3/11 connector ......3/22 Contents of RTC RAM ..3/11 Battery jumper ....3/22 3.5 Video adapter .....3/14 General ........3/14 Video controllers ... 3/15 LS PRO HARDWARE TECHNICAL REFERENCE 3/1...
  • Page 39: Introduction

    This section describes the LS Pro system board and the operation of its processing system and interface circuits. The LS Pro range uses a highly integrated, IBM AT compatible system board. In addition to standard features, the LS Pro system board provides: Ethernet interface, business audio subsystem, LOC Technology security subsystem and a mouse port.
  • Page 40 CONNECTOR PARALLEL PORT SOCKET PERIPHERALS CONTROLLER VIDEO TOKEN RING THICK CONTROLLER MODULE ETHERNET CONNECTOR SOCKET KEYBOARD CONTROLLER BATTERY POWER CONNECTOR SIMM SOCKETS 80387SX SOCKET R A M AUDIO ETHERNET CONTROLLER SCAMP FLOPPY PROCESSOR CONTROLLER LS PRO HARDWARE TECHNICAL REFERENCE 3/3...
  • Page 41: Description

    The block diagram is a functional description of the system board and does not identify specific chips. The LS Pro system board uses highly integrated components, reducing the chip count and the system board area, and increasing reliability. The VLSI SCAMP chipset integrates much of the standard AT system board peripheral logic onto a single chip.
  • Page 42: Processor System

    In the virtual 8086 mode the 80386SX/486SLC creates one or more 8086 environments within its protected multitask environment. This allows multiple 8086 tasks or a mixture of 8086 and 80286/80386 tasks to be executed concurrently. LS PRO HARDWARE TECHNICAL REFERENCE 3/5...
  • Page 43: Scamp

    System Board SCAMP The LS Pro system board is based on a VLSI VL82C311 single chip AT compatible chipset. The VL82C311 integrates the following standard AT system board peripheral logic in a single QFP package: • two 8237A DMA controllers •...
  • Page 44 Digital audio IRQ3 Reserved IRQ4 Serial port IRQ5 Reserved IRQ6 Floppy disk controller IRQ7 Parallel port Note IRQ0 and IRQ13 are both used inside the SCAMP chip. Neither emerges for use on the system board. LS PRO HARDWARE TECHNICAL REFERENCE 3/7...
  • Page 45: Direct Memory Access

    24-bit address. The bits 0-7 are taken directly from the 8237A address outputs, bits 8-15 are latched from the 8237A data outputs while bits 16-24 are from the appropriate DMA page register. 3/8 LS PRO HARDWARE TECHNICAL REFERENCE...
  • Page 46: System Timers

    A refresh request puts the processor into hold and accesses memory via a DMA type operation. Sound output The sound output may be set to give the output frequency required. To enable the output bit 0 of Port B (I/O 0061h) must be set to 1. LS PRO HARDWARE TECHNICAL REFERENCE 3/9...
  • Page 47: System Memory

    RAM available with each. Bank System board Upgrade to (Mbytes) capacity (Mbytes) (Mbytes) Note When banks 2 and 3 are both occupied by 8 Mbyte upgrades the RAM soldered to the system board is disabled. 3/10 LS PRO HARDWARE TECHNICAL REFERENCE...
  • Page 48: Real Time Clock (rtc) Ram

    (see also Apricot byte 2Bh) Reserved Apricot access rights Fixed disk drive type Floppy/Token-Ring autodetect Power on password Hard disk autodetect Equipment byte 38-3E Power on password Base memory (low byte) Byte checksum of bytes 38-3E LS PRO HARDWARE TECHNICAL REFERENCE 3/11...
  • Page 49 00h = VGA 01h = Not used (40 column colour) 02h = Not used (80 column colour) 03h = Not used (Monochrome) Reserved 1 = 80387 installed 1 = Diskette drive available for boot 3/12 LS PRO HARDWARE TECHNICAL REFERENCE...
  • Page 50 1 = cache enabled (see 2Bh) Reserved Reserved Access rights 1 = Setup access right enabled 1 = Floppy boot right enabled Reserved Floppy/ 1 = Token-Ring present Token-Ring 1 = Floppy drive present autodetect LS PRO HARDWARE TECHNICAL REFERENCE 3/13...
  • Page 51: Video Adapter

    VIDEO ADAPTER General The video adapter on the LS Pro system board is based on either a Cirrus Logic CL-GD5422 or 5426 chip. These chips contain all the elements of a VGA controller, except display memory, providing 100% compatibility with the IBM VGA standard.
  • Page 52: Floppy Disk Controller

    In this implementation a single 1.44 Mbyte floppy drive can be fitted. 720k and 1.44M diskettes are supported for both single and multithread operations. The default precompensation is 125 nanoseconds and is present for all cylinders. LS PRO HARDWARE TECHNICAL REFERENCE 3/15...
  • Page 53: Hard Disk Interface

    HARD DISK INTERFACE General The hard disk drive connector which is fitted on the LS Pro system board is an IDE connector which conforms to the ATA interface standard. The hard disk drive is accessed via a group of I/O ports at 01F0-01F7h. The function of each port is given in section 5.
  • Page 54: Peripherals Controller

    When either of the divisor latches is loaded, a 16-bit baud counter is immediately loaded. This prevents long counts on the first load. LS PRO HARDWARE TECHNICAL REFERENCE 3/17...
  • Page 55: Parallel Port

    The significance of port 0064h is described in section 5. Keyboard password security The 8042 provides a password security mechanism. Three commands are available regarding password operation: Test Password Installed Load Security Enable Security 3/18 LS PRO HARDWARE TECHNICAL REFERENCE...
  • Page 56: Loc Technology

    The system board is fitted with a LOC Technology security subsystem. This subsystem allows Apricot LOC Technology software to control access to data and facilities. When Apricot LOC Technology is not in use the security hardware is passive and has no effect on the system.
  • Page 57: 82596 Lan Coprocessor

    82503 automatically corrects the error by reversing the signals internally. 7997 The Ethernet transceiver chip acts as the interface between thick and thin Ethernet cabling standards, implementing the IEEE802.3 10BASE2 standard. 3/20 LS PRO HARDWARE TECHNICAL REFERENCE...
  • Page 58: Apricot Business Audio

    System Board 3.12 APRICOT BUSINESS AUDIO The Apricot Business Audio subsystem integrated on the LS Pro system board is based on a Yamaha YMZ263 chip. It offers two channels each of which can be independently configured to either playback or record.
  • Page 59: Floppy Drive Connector

    CMOS RAM is discharged. The jumper is identified in the illustration on page 2/5, and instructions on accessing the system board are given in section 2. 3/22 LS PRO HARDWARE TECHNICAL REFERENCE...
  • Page 60: Peripheral Items

    PERIPHERAL ITEMS Chapter 4...
  • Page 61 Jumpers ......... 4/12 Drive format ......4/12 Discache ....... 4/13 Quantum LPS525A ....4/13 Jumpers ......... 4/13 Drive format ......4/14 Discache ....... 4/14 IDE interface ......4/15 Interface signals ....4/15 Connectors ......4/16 LS PRO HARDWARE TECHNICAL REFERENCE 4/1...
  • Page 62: Power Supply

    PCB provides power for the system unit fan. Warning The auxiliary AC outlet must only be used to power monitors approved by Apricot. The power supply on/off switch acts as the system on/off switch and is operated from the front panel via a mechanical linkage.
  • Page 63: Connector

    Power good MONITORS Introduction Apricot supplies 14" colour SVGA, and 14" and 17" colour EVGA monitors. All Apricot SVGA and EVGA monitors described here are low emission monitors which are compliant with the MPR2 radiation legislation. These monitors are fully compatible with the adapter on the system board and may be used in any standard VGA display mode.
  • Page 64: Maintenance

    Video signal All the Apricot monitors can be used with any computer which supplies an analogue video signal with a 31.47kHz horizontal scan frequency. Because the monitors accept analogue video signals, an infinitely variable range of gray shades/colours may be displayed.
  • Page 65 This control adjusts the overall height of the on screen image, and only affects the 800x600 display mode. Horizontal phase This control adjusts the horizontal position of the display area, and only affects the 800x600 and 1024x768 display modes. LS PRO HARDWARE TECHNICAL REFERENCE 4/5...
  • Page 66: Hivision Low Emission 14" Colour

    Avoid setting the brightness and contrast controls for an excessively bright display. If such a display is left on the screen for an extended period the screen phosphor may be damaged. On the left side of the monitor are horizontal and vertical size and position controls. 4/6 LS PRO HARDWARE TECHNICAL REFERENCE...
  • Page 67: Hivision Low Emission 17" Colour

    800x600 and 1024x768 resolutions. External controls On the right side of the monitor are the power switch and brightness and contrast controls. These are shown in the following illustration. BRIGHTNESS POWER CONTRAST SWITCH CONTROL CONTROL LS PRO HARDWARE TECHNICAL REFERENCE 4/7...
  • Page 68 This control adjusts the horizontal position of the display area. Vertical size This control adjusts the overall height of the on screen image. Vertical position This control adjusts the vertical position of the display area. 4/8 LS PRO HARDWARE TECHNICAL REFERENCE...
  • Page 69: Vga Connector

    01F9h. The function of these registers and their bit significance is given in section 5. Quantum ProDrive ELS The 85, 127 and 170 Mbyte hard disk drives that may be fitted in the LS Pro range are from the Quantum ProDrive ELS range. The drives have nominal access times of 17mS and can transfer data at up to 4.0 Mbytes per second.
  • Page 70: Jumpers

    The three jumpers are labelled DS (Drive select), CS (Cable select) and SP (Slave present). The DS jumper must be fitted and the CS and SP jumpers not, in order for the drive to function in an LS Pro. Drive formats...
  • Page 71: Maxtor 7213a

    Peripheral items Maxtor 7213A The 213 Mbyte hard disk drive that may be fitted in the LS Pro range is a Maxtor 7213A. It has a nominal access time of 15mS and can transfer data at up to 8.0 Mbytes per second.
  • Page 72: Quantum Prodrive Lps240at

    Quantum ProDrive LPS 240AT The 240 Mbyte hard disk drive that may be fitted in the LS Pro range is a Quantum ProDrive LPS 240AT. It has a nominal access time of 16mS and can transfer data at up to 5.0 Mbytes per second.
  • Page 73: Quantum Prodrive Lps525at

    Full information on configuring Discache is given in the Quantum specification. Quantum LPS525A The 525 Mbyte hard disk drive that may be fitted in the LS Pro range is a Quantum LPS525A. It has a nominal access time of 10mS and can transfer data at up to 5 Mbytes per second.
  • Page 74: Drive Format

    Peripheral items The three jumpers are labelled DS (Drive select), CS (Cable select) and SP (Slave present). In the LS Pro application the DS jumper must be fitted and the CS and SS jumpers not. Warning None of the other jumpers are used in this application. If any of the other jumpers are installed the drive will not function correctly.
  • Page 75: Ide Interface

    Informs the system board that the drive data register has been enabled and the drive is prepared to perform a 16-bit I/O transfer. Host ADDR 0-2 These lines are used to select registers on the drive. LS PRO HARDWARE TECHNICAL REFERENCE 4/15...
  • Page 76: Connectors

    ADDR0 host data 14 host ADDR2 host data 0 host data 15 ground ground The pin layout of the connector. Power connector Function +12 Volts ground (for +12V) ground (for +5V) +5 Volts 4/16 LS PRO HARDWARE TECHNICAL REFERENCE...
  • Page 77: Floppy Drive

    FLOPPY DRIVE Description The floppy disk drive fitted in the LS Pro range is a 3.5", high density double-sided, one inch high unit. The drive can read and write 3.5" discs with a formatted capacity of either 1.44Mbytes or 720 kbytes. The drive has a constant disk rotation speed of 300 rpm.
  • Page 78 A low pulse on this input will cause the read/write head to move to the next track. The direction of movement is determined by the direction input at the end of the step pulse. 4/18 LS PRO HARDWARE TECHNICAL REFERENCE...
  • Page 79: Keyboard

    The following illustration shows the layout of the keys and the key legends on the UK keyboard. apricot Print Pause Scroll Scrn Lock SysRq Break £ & Home Page Insert Lock Page Delete Down Home Pg Up Caps Lock < > Pg Dn Enter Ctrl Alt Gr Ctri LS PRO HARDWARE TECHNICAL REFERENCE 4/19...
  • Page 80: Operation

    Echo (EEh) This is sent in response to an echo command from the system unit. Self-test pass (AAh) This code is sent to the system unit if the keyboard RAM and ROM self-test is passed. 4/20 LS PRO HARDWARE TECHNICAL REFERENCE...
  • Page 81: Commands From The System Unit

    When the keyboard receives any of these commands, it sends an ACKnowledge (FAh) response. If the data is incorrectly received the keyboard sends a RESEND (FEh) request. The use and formats of these commands is described in the following paragraphs. LS PRO HARDWARE TECHNICAL REFERENCE 4/21...
  • Page 82 The delay before the typematic operation comes into effect is shown in the table below: Delay 250mS 500mS 750mS 1000mS Enable (F4h) The keyboard responds with an ACK, clears its output buffer, and enables key scanning and keycode transmission. 4/22 LS PRO HARDWARE TECHNICAL REFERENCE...
  • Page 83: Scan Codes

    90 95 100 105 17 18 19 20 21 22 23 24 25 26 27 28 91 96 101 92 97 102 46 47 48 49 50 51 52 53 54 55 93 98 103 LS PRO HARDWARE TECHNICAL REFERENCE 4/23...
  • Page 84 The codes are listed in the following table: Scan code set 1 Make Break Make Break Number Code Code Number Code Code E0 38 E0 B8 E0 1D E0 9D E0 35 E0 B5 E0 1C E0 9C 4/24 LS PRO HARDWARE TECHNICAL REFERENCE...
  • Page 85 E0 D0 D0 2A E0 AA E0 49 E0 C9 E0 2A E0 AA E0 51 E0 D1 E0 2A E0 AA E0 4D E0 CD E0 2A E0 AA E0 35 E0 B5 E0 2A LS PRO HARDWARE TECHNICAL REFERENCE 4/25...
  • Page 86 F0 34 F0 71 F0 33 F0 7B F0 3B F0 79 F0 42 E0 5A E0 F0 5A F0 4B F0 76 F0 4C F0 05 F0 52 F0 06 F0 5D F0 04 4/26 LS PRO HARDWARE TECHNICAL REFERENCE...
  • Page 87 E0 F0 7C E0 7A E0 F0 7A Alt key active E0 74 E0 F0 74 F0 84 Ctrl key active E0 7E E0 This key does F0 7E not have a break code LS PRO HARDWARE TECHNICAL REFERENCE 4/27...
  • Page 88 F0 33 Typematic F0 6B Make only F0 3B Typematic F0 69 Make only F0 42 Typematic F0 77 Make only F0 4B Typematic F0 75 Make only F0 4C Typematic F0 73 Make only 4/28 LS PRO HARDWARE TECHNICAL REFERENCE...
  • Page 89: Connector

    F0 17 Make only Connector The keyboard is connected to the system unit via a 6-pin miniature DIN connector. The pinout and connector details are given below. Signal name Data Reserved Ground +5Vdc Clock Reserved LS PRO HARDWARE TECHNICAL REFERENCE 4/29...
  • Page 90: Keyloc Card

    KeyLOC CARD The KeyLOC card is a credit card sized unit which is used in conjunction with the Apricot LOC Technology software to control access to the computer and the data stored on it. The KeyLOC card consists of a plastic case and a small circuit board. The plastic case is in two halves and contains the circuit board and three small batteries.
  • Page 91 MEMORY AND I/O USAGE Chapter 5...
  • Page 92 1.6 Mbyte floppy ....5/12 Graphics controller IOCHCK ........ 5/12 registers ........ 5/23 Option ROM page ....5/12 Attribute controller Token-ring daughterboard 5/12 registers ........ 5/23 Microphone level control .. 5/13 CL-GD542X Extension registers ........5/25 LS PRO HARDWARE TECHNICAL REFERENCE 5/1...
  • Page 93: Memory And I/o Usage

    The SETUP utility allows BIOS shadowing to be enabled or disabled. If shadowing is enabled the BIOS on the system board is copied into RAM where it can be accessed faster. A more detailed description of the region between 768k and 1M (0C0000h and 100000h) is given over. 5/2 LS PRO HARDWARE TECHNICAL REFERENCE...
  • Page 94: Shadowing Disabled

    This often allows DOS to make better use of the available space. Note The Rev C system board has a slightly different memory map, refer to Appendix B for details. LS PRO HARDWARE TECHNICAL REFERENCE 5/3...
  • Page 95: I/o Space

    Memory and I/O Usage I/O SPACE The table below shows the general use of I/O space on the LS Pro system board. The pages which follow describe in more detail specific ports and groups of ports. Addresses (hex) Device 0000-000F...
  • Page 96: Dma I/o Address Map

    00D4 Channel 4-7 Mask register (set/reset) 00D6 Channel 4-7 Mode register (write) 00D8 Clear byte pointer (write) 00DA Master clear (write) 00DC Channel 4-7 Clear mask register (write) 00DE Channel 4-7 Write mask register LS PRO HARDWARE TECHNICAL REFERENCE 5/5...
  • Page 97: Interrupt Controllers

    Command/status When the system reads I/O location 0064h it receives information about the status of port the controller. When the system writes to I/O location 0064h the byte is interpreted as a command. 5/6 LS PRO HARDWARE TECHNICAL REFERENCE...
  • Page 98 Bit 7 Reserved. Read A read from port 0064h has the following significance. output buffer full input buffer full system flag command/data inhibit switch reserved general timeout parity error LS PRO HARDWARE TECHNICAL REFERENCE 5/7...
  • Page 99: Port B

    This bit reflects the condition of the I/O check latch. If the bit is set to 1 an I/O check has occurred. Bit 7 This bit reflects the condition of the Parity check latch. If the bit is set to 1 a Parity check has occurred. 5/8 LS PRO HARDWARE TECHNICAL REFERENCE...
  • Page 100: Rtc Ram/nmi Mask

    K (low byte) memory size in K (high byte) expanded memory size in K (low byte) expanded memory size in K (high byte) 19h-31h reserved 32h-33h configuration CRC 34h-36h reserved date century 38h-3Eh reserved checksum LS PRO HARDWARE TECHNICAL REFERENCE 5/9...
  • Page 101: Scamp Registers

    36 mapping registers through the two data ports. For further data ports information on EMS refer to the LIM 4.0 specification. The SCAMP EMS system is configured using the EMS configuration registers. 5/10 LS PRO HARDWARE TECHNICAL REFERENCE...
  • Page 102: Configuration Index And Data

    D0000-DFFFFh segment access control E0000-FFFFFh segment access control Reserved Miscellaneous control ROM and DMA control Bus control Apricot ports A block of 16 ports between 0120h and 012Fh are reserved for Apricot specific functions. Port Function LAN LED 1.6 Mbyte floppy reserved...
  • Page 103: Option Rom Page

    1 4Mbps is selected. Bit 2 This bit selects between 8 and 16-bit modes. When set to 0 8-bit operation is selected, when set to 1 16-bit is selected. 5/12 LS PRO HARDWARE TECHNICAL REFERENCE...
  • Page 104: Microphone Level Control

    When it is set high the LED is not lit. Bits 6,7 Reserved. Note The function of this port is different on Rev C system boards. Refer to Appendix B for further information. LS PRO HARDWARE TECHNICAL REFERENCE 5/13...
  • Page 105: Hard Disk Drive Controller Registers

    03FE 02FE Modem status register 03FF 02FF Scratch register The registers are described in detail in the manufacturers data sheets. Note Rev C system boards are not fitted with the second serial port (COM2). 5/14 LS PRO HARDWARE TECHNICAL REFERENCE...
  • Page 106: Ethernet Controller

    Memory and I/O Usage Ethernet controller The Ethernet controller on the LS Pro system board uses a block of 17 I/O ports from 0300h to 0310h. Port Function 82596 PORT address 0301-0303 reserved 82596 CA address 0305-0307 reserved 0308-030F Ethernet ID PROM...
  • Page 107 0 to bit 0 of 310h write to port 08Eh write a 1 to bit 0 of 310h write to port 08Eh write a 0 to bit 0 of 310h write to port 08Eh Bits 1-7 Reserved. 5/16 LS PRO HARDWARE TECHNICAL REFERENCE...
  • Page 108: Business Audio

    Memory and I/O Usage Business audio The Apricot business audio subsystem occupies a block of 8 ports from 0388h to 038Fh. Port Function 0388-038B reserved 038C Address 038D channel 0 data 038E reserved 038F channel 1 data The following descriptions are brief outlines of the function of the ports. A full description is given in the manufacturers data sheet.
  • Page 109: Parallel Port Controller

    When this bit is set to 0 the printer has received a character and is ready to accept another. Bit 7 This bit represents the state of the BUSY signal. When the signal is active the printer is busy and cannot accept data. 5/18 LS PRO HARDWARE TECHNICAL REFERENCE...
  • Page 110: Parallel Control Port

    DAC state register 03C7 Pixel address (read mode) 03C8 Pixel address (write mode) 03C9 Pixel data register These registers comply with the VGA standard. They are described in detail in the manufacturers data sheet. LS PRO HARDWARE TECHNICAL REFERENCE 5/19...
  • Page 111: Vga Registers

    The groups of registers are described in the following sections. There are several pairs of registers an index register and a data register. In these cases the index register is a pointer to a number of other registers which are accessed via the accompanying data register. 5/20 LS PRO HARDWARE TECHNICAL REFERENCE...
  • Page 112 The following table shows the index and the registers that are accessed via the index. Register Index Reset Clocking mode Map mask Character map select Memory mode These are standard VGA registers and are not described in further detail here. LS PRO HARDWARE TECHNICAL REFERENCE 5/21...
  • Page 113: Crt Controller Registers

    Vertical retrace end Vertical display enable end Offset Underline location Start vertical blank End vertical blank CRTC mode control Line compare These are standard VGA registers and are not described in further detail here. 5/22 LS PRO HARDWARE TECHNICAL REFERENCE...
  • Page 114: Graphics Controller Registers

    Each colour code is translated by a palette register into video signals to drive the monitor. The attribute controller registers are addressed by a single I/O port address. LS PRO HARDWARE TECHNICAL REFERENCE 5/23...
  • Page 115 The following table shows the index values and the registers that are accessed by them: Register Index Palette 00h to 0Fh Attribute mode control Overscan control Colour plane enable Horizontal pixel panning Colour select These are standard VGA registers and are not described in further detail here. 5/24 LS PRO HARDWARE TECHNICAL REFERENCE...
  • Page 116 Signature generator result (low byte) Signature generator result (high byte) VCLK0-3 denominator and post-scalar value 1B-1E BIOS ROM write enable and MCLK select * indicates that the register is present in the CL-GD5426, but not the CL-GD5422. LS PRO HARDWARE TECHNICAL REFERENCE 5/25...
  • Page 117 VGA standard. Note Revision C of the LS Pro system board is equipped with a CL-GD5410 video controller. This uses a different set of extension registers. Refer to Appendix B for further information.
  • Page 118 SPECIFICATIONS Appendix A...
  • Page 119: Specifications

    HiVision 17" Low Emission multi sync Width ..........................405 mm Height ..........................370 mm Depth ..........................480 mm Weight ..........................25.9 kg Resolution ......................1024x768 max Size ............................17" Viewable ..........................16" Pitch ..........................0.26mm LS PRO HARDWARE TECHNICAL REFERENCE A/1...
  • Page 120 Width .......................... 101.6 mm Depth .......................... 150.0 mm Weight ..........................425 g Rotational speed ......................300 rpm Track density ......................... 135 TPI Cylinders ..........................80 Tracks ............................. 160 R/W heads ..........................2 Encoding Method ......................MFM A/2 LS PRO HARDWARE TECHNICAL REFERENCE...
  • Page 121 Seek error rate ..................< 1 per 10 seeks Physical Rotation speed ......................3663rpm Recording density ....................38,600 bpi Track density ........................ 1800 tpi Cylinders ..........................1528 Disks ............................1/2 Tracks ......................3056/4584/6112 Heads ........................... 2/3/4 Capacity (formatted) ................85/127/170 Mbytes LS PRO HARDWARE TECHNICAL REFERENCE A/3...
  • Page 122 Capacity (formatted) ..................... 200Mbytes Quantum LPS 240AT Height ..........................25.4mm Depth ........................... 146.2mm Width ........................... 101.6mm Weight ..........................0.48 Kg Environmental Ambient temperature Operating ........................5 to 55 °C Non-operating ..................... -40 to 70 °C A/4 LS PRO HARDWARE TECHNICAL REFERENCE...
  • Page 123 Disk to Buffer .................... 3.8 Mbytes/second Seek time (ms) Average............................. 17 Track to track ........................... 4 Full stroke ..........................30 Quantum LPS525AL Height ..........................25.4mm Depth ..........................146mm Width ........................... 101.6mm Weight ..........................0.5 Kg LS PRO HARDWARE TECHNICAL REFERENCE A/5...
  • Page 124 Disks ............................3 Tracks ..........................14,688 Heads ............................6 Capacity (unformatted) ....................525 MB Seek time (ms) Average............................. 10 Track to track ........................... 3 Full stroke ..........................18 Maximum data To AT-bus....................5.0 Mbytes/second transfer rates A/6 LS PRO HARDWARE TECHNICAL REFERENCE...
  • Page 125 REVISION C SYSTEM BOARD Appendix B...
  • Page 126 Revision C system board This manual describes the LS Pro fitted with a Revision D system board. During the first eight months of production the LS Pro range was fitted with Revision C system boards. This Appendix helps you identify which revision of system board you have, and describes the differences between revisions C and D.
  • Page 127 Revision C system board CL-GD5410 The video adapter on revision C of the LS Pro system board is based on a Cirrus Logic CL-GD5410 chip. The CL-GD5410 contains all the elements of a VGA controller, except display memory, providing 100% compatibility with the IBM VGA standard.
  • Page 128 All the code in the region E0000h to EFFFFh region is used only at boot. Thus with the option ROM socket empty the region from C0000h to EFFFFh is available as DOS UMB space. LS PRO HARDWARE TECHNICAL REFERENCE B/3...
  • Page 129 Revision C system board I/O registers The function of two of the Apricot specific I/O ports are different on the revision C system board. The two ports are 121h and 12Ch. On revision C of the system board, port 121h is used to control the diagnostic LED on the system board.
  • Page 130 ERROR BEEP CODES Appendix C...
  • Page 131 If a blank screen is obtained, check that power is applied to both the system unit and monitor. Check that all cables are properly connected and that the system is properly configured. LS PRO HARDWARE TECHNICAL REFERENCE C/1...
  • Page 132 3-1-2 Master DMA register failure 3-1-3 Master interrupt mask register failure 3-1-4 Slave interrupt mask register failure 3-2-4 Keyboard controller failure 3-3-4 Screen memory failure 3-4-1 Screen initialisation failure 3-4-2 Screen retrace test failure C/2 LS PRO HARDWARE TECHNICAL REFERENCE...
  • Page 133 Error messages which appear on the screen are in text form, not error codes. The appropriate action can then be taken. For example: Error message Not a boot diskette - strike F1 to retry boot Action Insert correct disk and reboot LS PRO HARDWARE TECHNICAL REFERENCE C/3...
  • Page 134 INDEX...
  • Page 135 5/24 compatible 3/2 select register 5/24 enhanced keyboard 1/3 COM1 2/21, 3/17 ATA interface 3/2, 3/16 COM2 2/21, 3/17 attribute compatibility software 3/5 and graphics control register B/3 configuration data 5/9 LS PRO HARDWARE TECHNICAL REFERENCE 1...
  • Page 136 4/3 digital output register 5/17 extended Direct Memory Access 3/8 display controls register 5/25 Discache 4/10, 4/12, 4/14 sequencer mode register 5/25 disk format floppy 4/17 external layout 2/2 divisor latch registers 5/14 2 LS PRO HARDWARE TECHNICAL REFERENCE...
  • Page 137 HiVision monitor 4/6, 4/7 jumper horizontal battery 3/22 display enable end register 5/22 voltage 4/2 phase 4/5 voltage selection 2/11 pixel panning register 5/24 hard disk 4/10, 4/11, 4/12, 4/13 position (EVGA) 4/7, 4/8 LS PRO HARDWARE TECHNICAL REFERENCE 3...
  • Page 138 5/21 indicator 2/2 modem inlet 2/2 control register 3/17, 5/14 outlet 2/2 status register 3/17, 5/14 power supply 1/2, 2/3, 4/2 modes processor 3/5 metalwork removing 2/8 monitors 1/3, 4/3 removing 2/11 4 LS PRO HARDWARE TECHNICAL REFERENCE...
  • Page 139 3/17, 5/14 colour select 5/24 main status 5/17 CRT controller 5/20, 5/22 map mask 5/21 CRTC mode control 5/22 maximum scan line 5/22 cursor attributes B/3 memory mode 5/21 cursor end 5/22 miscellaneous 5/23 LS PRO HARDWARE TECHNICAL REFERENCE 5...
  • Page 140 2/13 IN 5/19 power supply 2/11 slot fan location 2/8 power supply metalwork 2/8 software compatibility 3/5 power switch linkage 2/14 sound output 3/9 RFI screening tray 2/15 SP jumper 4/10, 4/12, 4/14 6 LS PRO HARDWARE TECHNICAL REFERENCE...
  • Page 141 2/2, 2/4, 2/12 removing 2/11 top cover removing 2/5 TPE see twisted pair Ethernet tramsmit data 3/17 register 5/14 transparent colour registers 5/26 tray RFI screening 2/9, 2/16 twisted pair Ethernet port 2/2, 2/21 LS PRO HARDWARE TECHNICAL REFERENCE 7...
  • Page 142 APRICOT COMPUTERS LIMITED 3500 PARKSIDE BIRMINGHAM BUSINESS PARK BIRMINGHAM B37 7YS MITSUBISHI ELECTRIC Part No 15050131 Revision No 01...

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