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, A3000
and A4000 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.
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.