ACHME COMPUTER, INC.
====================

   VLB 486CT1

   Processor    80486SX/80487SX/80486DX/ODP486SX/80486DX2/Pentium 
                Overdrive                                         
   Processor    20/25/33/40/50(internal)/50/66(internal)MHz       
   Speed        
   Chip Set     OPTI                                              
   Max. Onboard 32MB                                              
   DRAM         
   Cache        64/128/256KB                                      
   BIOS         AMI                                               
   Dimensions   330mm x 218mm                                     
   I/O Options  32-bit VESA local bus slots (2)                   
   NPU Options  None                                              

<gopher://bitreich.org/I/th99/m/A-B/35000-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   | Purpose           | Location | Purpose          | Location |
   |-------------------+----------+------------------+----------|
   | External keyboard |    J2    | Green PC         |   JP38   |
   |-------------------+----------+------------------+----------|
   | External battery  |    J4    | 32 Bit VESA      | S1 & S2  |
   |                   |          | slots            |          |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 USER CONFIGURABLE SETTINGS                 |
   |------------------------------------------------------------|
   |               Function               | Jumper |  Position  |
   |--------------------------------------+--------+------------|
   |>> | Monitor type select monochrome   |  JP17  |    Open    |
   |---+----------------------------------+--------+------------|
   |   | Monitor type select color        |  JP17  |   Closed   |
   |---+----------------------------------+--------+------------|
   |>> | Factory configured - do not      |  JP18  |   Closed   |
   |   | alter                            |        |            |
   |---+----------------------------------+--------+------------|
   |>> | Factory configured - do not      |  JP22  | pins 1 & 2 |
   |   | alter                            |        |   closed   |
   |---+----------------------------------+--------+------------|
   |>> | Factory configured - do not      |  JP23  | pins 1 & 2 |
   |   | alter                            |        |   closed   |
   |---+----------------------------------+--------+------------|
   |>> | Factory configured - do not      |  JP26  | pins 1 & 2 |
   |   | alter                            |        |   closed   |
   |---+----------------------------------+--------+------------|
   |>> | Factory configured - do not      |  JP37  | pins 1 & 2 |
   |   | alter                            |        |   closed   |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                   PIN OUT CONFIGURATION                    |
   |------------------------------------------------------------|
   |          Function          |              J5               |
   |----------------------------+-------------------------------|
   |          Keylock           |       pins 3 & 5 closed       |
   |----------------------------+-------------------------------|
   |         Power LED          |       pins 1 & 2 closed       |
   |----------------------------+-------------------------------|
   |          Speaker           |  pins 7 , 8 , 9 & 10 closed   |
   |----------------------------+-------------------------------|
   |         Turbo LED          |      pins 12 & 13 closed      |
   |----------------------------+-------------------------------|
   |        Turbo switch        |    pins 15, 16 & 17 closed    |
   |----------------------------+-------------------------------|
   |        Reset switch        |      pins 19 & 20 closed      |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     DRAM CONFIGURATION                     |
   |------------------------------------------------------------|
   |       Size       |       Bank 0       |       Bank 3       |
   |------------------+--------------------+--------------------|
   |       1MB        |    (4) 256K x 9    |        NONE        |
   |------------------+--------------------+--------------------|
   |       2MB        |    (4) 256K x 9    |    (4) 256K x 9    |
   |------------------+--------------------+--------------------|
   |       4MB        |     (4) 1M x 9     |        NONE        |
   |------------------+--------------------+--------------------|
   |       5MB        |    (4) 256K x 9    |     (4) 1M x 9     |
   |------------------+--------------------+--------------------|
   |       5MB        |     (4) 1M x 9     |    (4) 256K x 9    |
   |------------------+--------------------+--------------------|
   |       8MB        |     (4) 1M x 9     |     (4) 1M x 9     |
   |------------------+--------------------+--------------------|
   |       16MB       |     (4) 4M x 9     |        NONE        |
   |------------------+--------------------+--------------------|
   |       17MB       |    (4) 256K x 9    |     (4) 4M x 9     |
   |------------------+--------------------+--------------------|
   |       17MB       |     (4) 4M x 9     |    (4) 256K x 9    |
   |------------------+--------------------+--------------------|
   |       20MB       |     (4) 1M x 9     |     (4) 4M x 9     |
   |------------------+--------------------+--------------------|
   |       20MB       |     (4) 4M x 9     |     (4) 1M x 9     |
   |------------------+--------------------+--------------------|
   |       32MB       |     (4) 4M x 9     |     (4) 4M x 9     |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                    CACHE CONFIGURATION                     |
   |------------------------------------------------------------|
   |   Size   |     Bank 0     |     Bank 1     |      TAG      |
   |----------+----------------+----------------+---------------|
   |   64KB   |   (4) 8K x 8   |   (4) 8K x 8   |  (1) 8K x 8   |
   |----------+----------------+----------------+---------------|
   |  128KB   |  (4) 32K x 8   |      NONE      |     NONE      |
   |----------+----------------+----------------+---------------|
   |  256KB   |  (4) 32K x 8   |  (4) 32K x 8   |  (1) 32K x 8  |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 CACHE JUMPER CONFIGURATION                 |
   |------------------------------------------------------------|
   | Size  |       JP1       |       JP6       |      JP7       |
   |-------+-----------------+-----------------+----------------|
   | 64KB  |   pins 1 & 2    |   pins 2 & 3    |   pins 2 & 3   |
   |       |     closed      |     closed      |     closed     |
   |-------+-----------------+-----------------+----------------|
   | 128KB |   pins 2 & 3    |   pins 1 & 2    |   pins 2 & 3   |
   |       |     closed      |     closed      |     closed     |
   |-------+-----------------+-----------------+----------------|
   | 256KB |   pins 4 & 5    |   pins 1 & 2    |   pins 1 & 2   |
   |       |     closed      |     closed      |     closed     |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                   CPU TYPE CONFIGURATION                   |
   |------------------------------------------------------------|
   |   Type    |        JP31        |    JP32    |     JP33     |
   |-----------+--------------------+------------+--------------|
   |  80486SX  | pins 3 & 4 closed  |    Open    | pins 2 & 3 , |
   |           |                    |            | 4 & 5 closed |
   |-----------+--------------------+------------+--------------|
   |  80486SX  |        Open        |    Open    |  pins 1 & 2  |
   |  (PQFP)   |                    |            |    closed    |
   |-----------+--------------------+------------+--------------|
   |  80487SX  | pins 2 & 3 , 4 & 5 | pins 1 & 2 | pins 2 & 3 , |
   |           |       closed       |   closed   | 4 & 5 closed |
   |-----------+--------------------+------------+--------------|
   |  80486DX  | pins 2 & 3 , 4 & 5 | pins 2 & 3 | pins 2 & 3 , |
   |           |       closed       |   closed   | 4 & 5 closed |
   |-----------+--------------------+------------+--------------|
   |  80486DX  | pins 1 & 2 closed  | pins 4 & 5 |  pins 1 & 2  |
   |  (PQFP)   |                    |   closed   |    closed    |
   |-----------+--------------------+------------+--------------|
   | ODP486SX  | pins 2 & 3 , 4 & 5 | pins 1 & 2 | pins 2 & 3 , |
   |           |       closed       |   closed   | 4 & 5 closed |
   |-----------+--------------------+------------+--------------|
   | 80486DX2  | pins 2 & 3 , 4 & 5 | pins 2 & 3 | pins 2 & 3 , |
   |           |       closed       |   closed   | 4 & 5 closed |
   |-----------+--------------------+------------+--------------|
   |  Pentium  | pins 2 & 3 , 4 & 5 | pins 1 & 2 | pins 2 & 3 , |
   | Overdrive |       closed       |   closed   | 4 & 5 closed |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                  CPU SPEED CONFIGURATION                   |
   |------------------------------------------------------------|
   | Speed | OSC.  |       JP8       |  JP12  |  JP13  |  JP14  |
   |-------+-------+-----------------+--------+--------+--------|
   | 20MHz | 40MHz |   pins 2 & 3    | Closed | Closed |  Open  |
   |       |       |     closed      |        |        |        |
   |-------+-------+-----------------+--------+--------+--------|
   | 25MHz | 25MHz |   pins 2 & 3    |  Open  |  Open  | Closed |
   |       |       |     closed      |        |        |        |
   |-------+-------+-----------------+--------+--------+--------|
   | 33MHz | 33MHz |   pins 1 & 2    | Closed |  Open  |  Open  |
   |       |       |     closed      |        |        |        |
   |-------+-------+-----------------+--------+--------+--------|
   |  50i  | 25MHz |   pins 2 & 3    |  Open  |  Open  | Closed |
   |  MHz  |       |     closed      |        |        |        |
   |-------+-------+-----------------+--------+--------+--------|
   | 50MHz | 50MHz |   pins 1 & 2    |  Open  | Closed |  Open  |
   |       |       |     closed      |        |        |        |
   |-------+-------+-----------------+--------+--------+--------|
   |  66i  | 33MHz |   pins 1 & 2    | Closed |  Open  |  Open  |
   |  MHz  |       |     closed      |        |        |        |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |          VESA WAIT STATE/BUS SPEED CONFIGURATION           |
   |------------------------------------------------------------|
   |   CPU speed   |  Wait states  |     JP19     |    JP20     |
   |---------------+---------------+--------------+-------------|
   |    <=33MHz    | 0 wait states |     Open     |    Open     |
   |---------------+---------------+--------------+-------------|
   |    >33MHz     | 1 wait state  |    Closed    |   Closed    |
   +------------------------------------------------------------+