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Amiga Technical References

A2088 XT Bridgeboard Information

Jumper and socket locations:


---------------------------------------------------------------------  
|                                                                   |  
|                                               J2                  |  
|                                                                   |--
|                                                        ----     ::| |
|                                         ------------   |21|     ::|F|
|                                         |   8087   | J1|43|     ::|L|
|                                         |   FPU    |   |65|    J::|O|
|                                         ------------   ----    3::|P|
|                                         ------------            ::|P|
|                                         |   8088   |            ::|Y|
|                                         |   CPU    |            ::| |
|                              --------   ------------              |--
|                              | BIOS |                             |  
|                              | ROM  |                             |  
|                              --------                             |  
|                                                                   |  
|                                                                   |  
---------------------------------------------------------------------  
     |      Zorro Connector      |               |      XT       |     
     -----------------------------               -----------------     

Jumper Information.

  • J1: Default video display.
    1. Monochrome: Pins 4-6 and 3-5 (default).
    2. Color 40x25: Pins 4-6 and 1-3.
    3. Color 80x25: Pins 2-4 and 3-5.
    4. None: Pins 2-4 and 1-3.

  • J2: Connector for PC speaker.

  • J3: Internal 360KB floppy drive connector.


Technical Specifications:

  • Function: Provides an IBM-PC/XT compatible coprocessor system for a computer in the A2000/3000/4000 series.

  • Processor: 8088

  • Clock Speed: 4.77mhz

  • Coprocessor: Optional 8087 FPU supported

  • Memory: 512K supplied

  • Floppy Disks: Supports up to 2 standard PC floppy disk drives:
    • 5.25" Drives: 360KB (Comes standard with 360KB drive)
    • 3.5" Drives: 720KB (Uses Amiga external floppies drives on the external floppy connector)

  • Card Type: Uses both Amiga bus and PC ISA bus. Occupies one of the two combined positions.

  • Video Display:

    1. IBM-PC MDA Monochrome 80x25 text mode.

    2. IBM-PC CGA Color text (80x25 & 40x25) and graphics (640x200x2 & 320x200x4 color) modes supported in Amiga windows simultaneously.

  • Keyboard: IBM-PC/XT keyboard emulation using the Amiga keyboard

  • Parallel Port: IBM-PC compatible Centronics port emulation using the Amiga's parallel port.

  • ROM: 16KB XT-compatible BIOS

  • Interprocessor Communications: 128K of shared memory, ability for PC to interrupt Amiga and vice versa.


Copyright © 2000 Amiga Auckland Inc. All rights reserved.
Revised: June 16, 2005.