A2286 AT Bridgeboard Information

Jumper and socket locations:


---------------------------------------------------------------------
|Main       J4                --------------------------------------|
|Board                        |Sandwich         J                ::||
|                             | Board           1               F::||
|                             |                 3               L::||
|                             |                    J      J     O::||
|                             |                    1      6     P::||
|                             |                    4            P::||
|                             |     - - - - - -                 Y::||
|                             |     |  80287  | -------          ::||
|                             |     |   FPU   | |O-ROM|            ||
|                             |     - - - - - - -------            ||
|                             |                 -------            ||
|                             |                 |E-ROM|            ||
|                             |                 -------            ||
|                             |                 J5                 ||
|                             |                                    ||
|                             --------------------------------------|
---------------------------------------------------------------------
     |      Zorro Connector      |  |    AT    | |      XT       |
     -----------------------------  ------------ -----------------

Jumper Information.

    J4: (1-2) Internal floppy disk controller. Pins 1-2 for enabled, Pins 2-3 to disable.

    J5, (2-3) RAM configuration. Pins 1-2 for 640K, Pins 2-3 for 1024K.

    J6: (2-3) Internal disk type. Pins 1-2 for PS/2 Mode, Pins 2-3 for AT Mode.

    J13: Lithium battery connector. To store BIOS setup.

    J14: (1-2) Default video mode configuration. Pins 1-2 for Mono, Pins 2-3 for Color. 

    There is  more specific information on these and other A2286 jumpers.

Technical Specifications:

    Function: Provides an IBM-PC/AT compatible coprocessor system for a computer in the A2000, A3000
              and A4000 series.

    Processor: 80286

    Clock Speed: 8mhz

    Coprocessor: Optional 80287 FPU supported. Located under sandwich board.

    Memory: 1MB supplied

    Floppy Disks: Supports up to 2 standard PC floppy disk drives: 
                  5.25" Drives: 360KB, 1.2MB (Comes standard with 1.2MB drive) 
                  3.5" Drives: 720KB, 1.44MB 

    Card Type: Uses both Amiga bus and PC ISA bus.

    Video Display:

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

      2. IBM-PC/AT 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/AT compatible Centronics port emulation using the Amiga's parallel port.

    ROM: 16KB AT-compatible BIOS

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