1. Manuals
  2. Brands
  3. Lobo Drives Manuals
  4. Computer Accessories
  5. LX80
  6. User manual

Lobo Drives LX80 User Manual

Expansion interface
Hide thumbs
Table of Contents

Advertisement

Quick Links

Download this manual

Advertisement

Table of Contents
loading

Summary of Contents for Lobo Drives LX80

  • Page 2 LOBO Drives Model LX80 Expansion Interface...

  • Page 3: Table Of Contents

    117VAC/60HZ Keyboard Power Cable Installation LIST OF ILLUSTRATIONS FIGURE TITLE PAGE LX80 Expansion Interface Peripheral Connections 1-2 Keyboard Flat Cable Installation Mini and 8" Floppy Disk Connections Drive 0 Configuration Switches AC Power Voltage Modifications Keyboard Power Cable Installation...

  • Page 4: Section I

    1.2 SYSTEM DESCRIPTION The Model LX80 Expansion Interface is designed for the serious user who wants to improve the performance and capabilities of the TRS-80 computer. Incorporating many of the features of Radio Shack's expansion interface, the Model LX80 offers many improved and new features.
  • Page 5 Other features include: a parallel port that functions like the Centronics printer port on the Radio Shack interface; a screen printer port; two programmable bidirectional serial ports; and a crystal controlled "Real Time" clock. Figure 1-1. LX80 Expansion Interface Peripheral Connections.

  • Page 6: Section Ii - Unpacking The Interface

    SECTION II UNPACKING THE INTERFACE 2.1 VISUAL INSPECTION Before you open the shipping container, visually inspect it for evidence of shipping damage or mishandling, If such damage is present, a report should be filed with the carrier as soon as possible. Do not remove or operate the expansion interface if any possibility of damage is evident.

  • Page 7: Unpacking Disk Drives

    2.1 and 2.2. Check that you have the correct long flat data cable for your type of drive. Contact your local dealer or LOBO DRIVES if any item(s) is missing. a. Mini Floppies - require long 34-conductor, five connector cable.

  • Page 8: Section Iii - Setting Up The System

    Find a space large enough to hold all the components of your system, plus adequate work space. Be sure you will have enough AC power outlets to run all the components of your system. LOBO DRIVES recommends the use of a fused, switched power distribution box. To set up your system, proceed as follows: 1.
  • Page 9 3. Remove the protective plastic connector cover from the back of the keyboard. Plug the free end of the interface cable onto the exposed connector Do not attempt to connect the interface to a keyboard with a DIN cable modification Do not use a "Buffered"...
  • Page 10 Figure 3-2. Mini and 8" Floppy Disk Connections NOTE Check the drive part numbers. Only one drive can contain termination resistors, and that drive must be the furthest from the interface, Any unused connectors must be at the END of the cable.
  • Page 11 10. If installing a hard disk drive, refer to its own information sheet and connect to the interface. 11. You must set the "drive configuration" switches on the rear panel of the interface. These switches tell the interface what to do when you power-up or reset the system. Normally, you want the interface to load the operating system software from your fastest disk drive (this will be DRIVE 0).
  • Page 12 NOTE Selection of DRIVE 1, DRIVE 2, DRIVE 3, . . . depends upon the operating system software. Refer to the appropriate section in the disk operating system manual. 12. Place the interface's NML-ALT switch in the NML position. 13. Turn all of the units OFF. Plug everything into the AC line (or into the power distributor box), Turn everything ON following this sequence: a.

  • Page 13: Section Iv - Troubleshooting Hints

    SECTION IV TROUBLESHOOTING HINTS Due to the complex nature of the circuitry utilized in the Model LX80 Expansion Interface, user troubleshooting must logically be limited to a few simple checks. Should an Expansion Interface malfunction persist after the hints provided in this section are followed, the user should refer the problem to the nearest LOBO DRIVES dealer or contact LOBO DRIVES directly.
  • Page 14 Technicians work on them under special anti-static conditions with grounding straps and other equipment not normally available to user/owners. Unless you are a trained computer technician, refer all service to your local LOBO DRIVES dealer.

  • Page 15: Section V - Diskette Care

    SECTION V DISKETTE CARE Diskettes are precision recording media. Handle them very carefully to get maximum life from each one. In general, follow the special handling precautions used with both tape cassettes and high fidelity records and the instructions below: a.
  • Page 16 h. Remove the diskette from the drive before turning the power ON or OFF. i. Special "write protect" stickers may be placed over the write protect notch in the edge of the diskette to protect your data, When a sticker covers the notch of a mini diskette, it becomes impossible for the computer to add or change information stored on the diskette.

  • Page 17: Section Vi - Technical Data

    SECTION VI TECHNICAL DATA 6.1 MEMORY MAP ADDRESS 0000H-2FFFH alternate ROMs if selected by the switch 3000H- 33FFH disk boot and I/O ROM 37E0H-37E3H read for interrupt code (clears RTC interrupt) 37E8H-37EBH read for line printer and hard disk status, write for line print output 8000H-BFFFH first 16K RAM add-on...

  • Page 18: Interface Specifications

    PORT INPUT OUTPUT BAUD rate A BAUD rate B reset boot logic 6.3 INTERFACE SPECIFICATIONS a. Outside dimensions: Height 2.8" (7 cm) Width 19.0" (48 cm) Depth 11.8" (30 cm) b. Power Requirements: 117VAC 60HZ or 235VAC 50HZ (internally jumpered) Three wire (grounded) power cord 40 watts c.
  • Page 19 d. Disk storage (maximum formatted, depends upon software): SA-400 (single sided mini floppy drive) single density 89K bytes double density 161K bytes SA-450 (double-sided mini floppy drive) single density 179K bytes double density 322K bytes SA-800 (single sided 8" floppy drive) single density 335K bytes double density 611K bytes SA-850 (double sided 8"...

  • Page 20: Installing Your Own 16K Ram

    6.4 INSTALLING YOUR OWN 16K RAM a. It is easy for you to install your own RAM chips that you can purchase as an upgrade kit. Simply UNPLUG THE INTERFACE AC CORD, remove the two cover screws, and carefully lift the cover. b.

  • Page 21: Configuring The Rs-232 Jumper Plugs

    c. Jumpering for 2316E, 2716s, (+5v only): Connect pins 1-5, 2-4, 3-19, 12-13-14-16 d. Jumpering for 2332s, 2732s, (+5v only): Connect pins 1-6, 2-5, 3-10, 4-12-13-14 e. Here is a description of the ROM jumper plug pins: 1 decoder input B 16 +5 volts 2 decoder input A 15 -5 volts...
  • Page 22 1 +12 volts 24 not used 2 TxD (transmit data) 23 DB-25S pin 9 3 TxC (transmit clock) 22 DB-25S pin 24 4 RTS (request to send) 21 DB-25S pin 4 5 DTR (data terminal ready) 20 DB-25S pin 20 6 RxD (receive data) 19 DB-25S pin 3 7 RxC (receive clock)

  • Page 23: Modifying Power Supply For 235Vac/50Hz Or 117Vac/60Hz

    CLOCK CODE CLOCK CODE 28.8K 1200 32.081K 1760 38.4K 2152.3 57.6K 2400 76.8K 4800 115.2K 9600 153.6K 19,200 316.8K Note that the SIO controller can divide these clocks by 1, 16 or 64, giving all of the popular baud rates. 6.7 MODIFYING POWER SUPPLY FOR 235VAC/50HZ or 117VAC/60HZ a.
  • Page 24 c. If you are modifying for 117VAC, use, refer to Figure 6-1b: i. Connect the cold (white wire) side of the AC input power to the bottom lug of the ON/OFF switch. This restores the neon lamp operation. ii. Rewire the power supply transformer so that power comes in on pins 1 & 4. Pins 1 & 3 and pins 2 & 4 must be connected together.

  • Page 25: Keyboard Power Cable Installation

    Figure 6-2. Keyboard Power Cable Installation 6.8 KEYBOARD POWER CABLE INSTALLATION a. To install the keyboard power cable, first obtain the following parts: 1) DIN plug 2) Four-conductor round cable (stranded wire, 20AWG). 3) Cable strain relief (HEYCO) that fits the hole in the rear panel of the interface. b.
  • Page 26 c. Open the interface: UNPLUG THE AC CORD. Remove the two screws and carefully lift the cover. d. Pass the loose end of the cable through the KBD POWER hole and into the rear of the interface cabinet. Feed in just enough wire so that the cable will reach the furthest corner of the power supply. Force the strain relief over the cable and into the cabinet hole.

Table of Contents