HotShot/286                                         AST Part Number 202160-001 **

HotShot/286 is an accelerator card designed to fit any expansion slot in your
IBM personal computer PC or PC XT or compatible computer.

HotShot/286 features:

   o A 16-bit Intel 80286 microprocessor that runs at a clock speed of 10
     megahertz (MHZ)

   o Cache memory

Using Cache:

    HotShot/286 speeds your PC's access to the most-recently accessed data and
    instructions. Words can be accessed up to twice as fast from cache memory.
    Switch-selectable cached memory also allows HotShot/286 to avoid areas of
    memory that cannot be cached (for example, the memory range used by the
    PC-XT fixed disk controller).

Using a Co-Processor:

    HotShot/286 accommodates the Intel 80287 math co-processor.  With the
    appropriate software, the math coprocessor enables your PC to perform
    high-speed, highly accurate arithmetic, logarithmic, and trigonometric
    functions in parallel with the processor.

EEMS Compatibility:

    HotShot/286 is designed to complement and accelerate operation with AST's
    enhanced expanded memory specification (EEMS) products such as Rampage or
    SixPakPremium.  HotShot/286 automatically updates cache memory whenever
    your AST EEMS product swaps memory pages, providing designed-in
    compatibility.


SWITCH SETTINGS

    Cached Memory Settings for Base (0-640K)

        SW1  SW2  SW3  Cached Area
        ---  ---  ---  --------------
        OFF  OFF  OFF  Cache Disabled *
        ON   ON   OFF  0-256 KB
        ON   OFF  ON   0-512 KB
        ON   ON   ON   0-640 KB

        * = Default Setting

    Cached Memory Settings for Extended (640KB-1024KB)

        SW4  SW5  SW6  SW7  Cached Area
        ---  ---  ---  ---  ---------------
        OFF  OFF  OFF  OFF  Cached Disabled *
        ON   OFF  OFF  OFF  0C0000-0CFFFFH
        ON   ON   OFF  OFF  0C4000-0D3FFFH
        OFF  ON   OFF  OFF  0C8000-0D7000H
        OFF  ON   ON   OFF  0CC000-0DBFFFH
        OFF  OFF  ON   OFF  0D0000-0DFFFFH
        ON   OFF  ON   OFF  0D4000-0E3FFFH
        ON   ON   ON   OFF  0D8000-0E7FFFH
        ON   ON   ON   ON   0DC000-0EBFFFH
        OFF  ON   ON   ON   0E0000-0EFFFFH
        OFF  OFF  ON   ON   0CC000-0EFFFFH
        ON   OFF  ON   ON   0A0000-0AFFFFH
        ON   OFF  OFF  ON   0A0000-0B7FFFH
        ON   ON   OFF  ON   0CC000-0DBFFFH and 0A0000-0AFFFFH
        OFF  ON   OFF  ON   0CC000-0DBFFFH and 0A0000-0B7FFFH
        OFF  OFF  OFF  ON   0D0000-0DFFFFH and 0A0000-0B7FFFH

        * = Default Setting


JUMPER SETTINGS

    JP1 = Boot mode

        Upper pair of pins = Fast mode boot

        Lower pair of pins = Non-accelerated mode boot (default)


CONNECTORS

    J1 = Ribbon cable connection from 8086/8088 socket to HotShot/286


SOCKETS

    U2 = Socket for math co-processor (80287)


BOARD DIAGRAM

    +---------------------------------+
    |              J1 ::::::::::::::: | +---
    |                                 +-+
    |                           .     | |
    |       _____               .     | |
    |      |8    |U2            . JP1 | |
    |      | 0   |                    | |
    |      |  2  |                 __ | |
    |      |   8 |               S|  || |
    |      |____7|               W|  || |
    |                            1|__|+-+
    +---------------+            +----+ |
                    +------------+      |
                                        |