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MESA Electronic 4C24 Manual

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4C24 CPU MANUAL
VERSION 1.5
Copyright 1997 by MESA ELECTRONICS Richmoond, CA. Printed in the United States of
America. All rights reserved. This document and the data disclosed herein is not to be reproduced,
used, disclosed in whole or in part to anyone without the written permission of MESA
ELECTRONICS.
Mesa Electronics
4175 Lakeside Drive, Suite #100
Richmond, CA 94806-1950
Tel (510) 223-9272 - Fax (510) 223-9585
E-Mail: tech@mesanet.com
- Website: www.mesanet.com

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  • Page 1 4C24 CPU MANUAL VERSION 1.5 Copyright 1997 by MESA ELECTRONICS Richmoond, CA. Printed in the United States of America. All rights reserved. This document and the data disclosed herein is not to be reproduced, used, disclosed in whole or in part to anyone without the written permission of MESA ELECTRONICS.

  • Page 3: Table Of Contents

    4C24 CPU USER'S MANUAL TABLE OF CONTENTS HANDLING PRECAUTIONS Lithium cell ................
  • Page 4 4C24 CPU USER'S MANUAL TABLE OF CONTENTS DISK EMULATOR OPERATION General ................
  • Page 5 4C24 CPU USER'S MANUAL...

  • Page 6: Handling Precautions

    4C24 CPU USER'S MANUAL HANDLING PRECAUTIONS LITHIUM CELL The 4C24 CPU card contains a lithium cell which can create a fire or explosion hazard if improperly handled. Do not expose battery to temperatures in excess of 100 degrees Celsius or dispose of in fire.

  • Page 7: Introduction

    The 4C24 is a low power, all CMOS, AT compatible CPU implemented on the PC/104 bus. The 4C24 can use various CPU's from 33 MHz 386SX to a 25/50 MHz TI 486SLC2 CPU. A Cyrix 87SLC math coprocessor is available as an option. System memory can be 1M byte or 4M bytes. A precision reset circuit, watchdog timer, EEPROM setup storage, and built in disk emulator make the 4C24 especially suited to embedded applications.

  • Page 8: Configuration

    When the words "up", and "down" are used it is assumed that the 4C24 CPU card is oriented with its bus connectors J1 and J2 at the bottom edge of the card (nearest the person doing the configuration).

  • Page 9: Default Jumper Settings

    4C24 CPU USER'S MANUAL CONFIGURATION DEFAULT JUMPER SETTINGS Page 9...

  • Page 10: Watchdog Enable

    W8 on both pins in order to use the battery backed clock/calendar. The 4C24 BIOS does not use the CMOS setup RAM, so it is possible to run the 4C24 with no Lithium cell if desired.

  • Page 11: Connectors

    (+5V only) 3.5 inch floppy drives. Since the power connector on the 4C24 may power the whole PC104 stack, it is suggested that only gold plated connectors be used. Tin plated connectors have a pronounced tendency to fail over time via increased contact resistance when operated at anywhere near their rated current.

  • Page 12: Serial Port Connectors

    KBVCC Keyboard +5V If a keyboard is not used, it is possible to speed up 4C24 boot-up by grounding KBCLK. This informs the BIOS that no keyboard is present. This avoids the 2-3 second wait for keyboard response to the reset command.

  • Page 13: Parallel Port Connector

    +5V user power or key PARALLEL PORT CONNECTOR The 4C24 has a parallel printer port. The connector for the parallel port uses a 26 pin, 2mm header to save space. An adapter widget is available from MESA that converts between the 1mm cable and standard .050 flat cable.
  • Page 14 4C24 CPU USER'S MANUAL CONNECTORS PARALLEL PORT Parallel port connector pin-out is as follows: HEADER PIN DSUB PIN SIGNAL FUNCTION /PSTB Strobe (out) /PAFD Auto LF (out) /PD0 Data 0 /PERROR Printer error (in) Data 1 /PINIT Reset printer (out)

  • Page 15: Cpu Operation

    CPU instructions when idle. 4C24's with Cyrix or TI 486SLC 's can be put into a low power mode by simply halting the CPU. The BIOS keyboard input (Int 16 function 0) routine does this automatically, so application programs that call this function when waiting for input will use minimum power.

  • Page 16: Setup Storage

    This file has all of the available setup options specified. Normal usage of the 4C24.CF file is to leave all of the options in the file, but comment out the undesired options. options can be commented out by preceding the line with a semicolon.
  • Page 17 4C24 CPU USER'S MANUAL CPU OPERATION SET4CSIO The format of the configuration file is very simple: each line of the configuration file consists of a parameter name followed by a parameter value. If a parameter name is not specified in the configuration file, that parameter will be set to the default value shown in the following table.
  • Page 18 4C24 CPU USER'S MANUAL CPU OPERATION SET4CSIO PARAMETER PARAMETER VALUES DEFAULT PRIMSER-ADDRESS COM3 COM4 Sets the address of the primary serial port (The port connected to P2). If set to COM3 or COM4, the address is determined by the COM3&4-ADDRESS parameter.

  • Page 19: Serial File Download

    If you do not wish to make a cable, a down load adaptor cable is available from MESA. The part name is DWLDADPT. This is a five foot cable with a 10 pin header on one end (the 4C24 end) and a female 9 pin D connector at the other end.

  • Page 20: Console Switching

    CONSOLE SWITCHING To simplfy system initialization, the 4C24 will use the COM1 serial port as the console if no video adaptor is found at system startup. The default baud rate is 9600. This console re-direction can be disabled in the EEPROM setup if desired.

  • Page 21: Hard Drives

    The 4C24 BIOS supports IDE type hard drives. You need to supply an external IDE controller card (our 4I26 for example) to use the 4C24 with an IDE drive. The 4C24 BIOS reads the hard drive parameters directly from the IDE drive. This means that no drive parameter information is stored on the 4C24 card.

  • Page 22: General

    DISK EMULATOR OPERATION GENERAL The 4C24 has a built in nonvolatile disk emulator with a capacity of up to 2M bytes using EPROM or 1 M byte using flash EEPROM. Two 32 pin sockets on the 4C24 can be used for disk emulator memory chips. These two chips can be used together as a single drive, or each chip can be configured as an independent drive.

  • Page 23: Disk Emulator Initialization

    ( Initialize disk starting at socket 1, using 1 sockets and device type 5 - ROM-DOS format) Once the disk emulator has been initialized, the 4C24 needs to be reset before the new disk will be recognized by the operating system.

  • Page 24: I/O Connector Orientation

    I/O CONNECTOR ORIENTATION The serial port connectors on the 4C24 are 10 pin, right angle .1" headers. Pin 10 of the serial port connector can be cut, and a keying plug installed in the cable mount header if desired to prevent reverse installation of the serial cables.
  • Page 25 4C24 CPU USER'S MANUAL REFERENCE INFORMATION SPECIFICATIONS UNIT POWER SUPPLY Voltage Supply current (full speed 386SX) Supply current (sleep mode386SX) Supply current (full speed 486SLC) Supply current (sleep mode 486SLC) BUS LOADING AND DRIVE: Input capacitance Input leakage current Output drive capability...

  • Page 26: Warranty

    4C24 CPU USER'S MANUAL REFERENCE INFORMATION WARRANTY Mesa Electronics warrants the products it manufactures to be free effects in material and workmanship under normal use and service for the period of 2 years from date of purchase. This warranty shall not apply to products which have been subject to misuse, neglect, accident, or abnormal conditions of operation.

  • Page 27: Schematic Diagrams

    4C24 CPU USER'S MANUAL REFERENCE INFORMATION SCHEMATIC DIAGRAMS Page 27...

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