DIAMOND FLOWER, INC.
====================

   486SX-20/25UNB AIO

   Processor         80486SX/80487SX                              
   Processor Speed   20/25MHz                                     
   Chip Set          UMC                                          
   Max. onboard DRAM 16MB                                         
   Cache             None                                         
   BIOS              AMI                                          
   Dimensions        330mm x 218mm                                
   I/O Options       Floppy drive interface, IDE interface,       
                     parallel port, PS/2 mouse port, serial port  
                     (2), VGA feature connector, VGA port         
   NPU Options       None                                         

<gopher://bitreich.org/I/th99/m/C-D/31553-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   | Purpose           | Location | Purpose          | Location |
   |-------------------+----------+------------------+----------|
   | IDE interface     |   CN1    | Turbo switch     | J3 & J8  |
   |-------------------+----------+------------------+----------|
   | Floppy drive      |   CN2    | Reset switch     | J4 & J9  |
   | interface         |          |                  |          |
   |-------------------+----------+------------------+----------|
   | VGA feature       |   CN3    | IDE interface    |    J5    |
   | connector         |          | LED              |          |
   |-------------------+----------+------------------+----------|
   | VGA port          |   CN4    | Power LED &      |    J6    |
   |                   |          | keylock          |          |
   |-------------------+----------+------------------+----------|
   | Parallel port     |   CN5    | Speaker          |    J7    |
   |-------------------+----------+------------------+----------|
   | Bus mouse port    |   CN6    | External battery |   J10    |
   |-------------------+----------+------------------+----------|
   | Serial port       |   CN7    | Serial port      |   JP31   |
   | (COM1)            |          | (COM2)           |          |
   |-------------------+----------+------------------+----------|
   | Keyboard          |    J1    | Keyboard         |   KBD1   |
   | connector         |          | connector        |          |
   |-------------------+----------+------------------+----------|
   | Turbo LED         |    J2    | Riser card       |    S1    |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 USER CONFIGURABLE SETTINGS                 |
   |------------------------------------------------------------|
   |               Function               | Jumper |  Position  |
   |--------------------------------------+--------+------------|
   |>> | Battery select internal          |  J11   | pins 2 & 3 |
   |   |                                  |        |   closed   |
   |---+----------------------------------+--------+------------|
   |   | Battery select external          |  J11   | pins 1 & 2 |
   |   |                                  |        |   closed   |
   |---+----------------------------------+--------+------------|
   |>> | Speaker select internal          |  JP1   |   Closed   |
   |---+----------------------------------+--------+------------|
   |   | Speaker select external          |  JP1   |    Open    |
   |---+----------------------------------+--------+------------|
   |>> | Factory configured - do not      |  JP4   |    Open    |
   |   | alter                            |        |            |
   |---+----------------------------------+--------+------------|
   |>> | Factory configured - do not      |  JP5   | pins 2 & 3 |
   |   | alter                            |        |   closed   |
   |---+----------------------------------+--------+------------|
   |   | CPU speed select 20MHz           |  JP6   |   Closed   |
   |---+----------------------------------+--------+------------|
   |   | CPU speed select 25MHz           |  JP6   |    Open    |
   |---+----------------------------------+--------+------------|
   |>> | Factory configured - do not      |  JP7   |    Open    |
   |   | alter                            |        |            |
   |---+----------------------------------+--------+------------|
   |>> | BIOS type select 27C256 (32KB)   |  JP8   | pins 2 & 3 |
   |   |                                  |        |   closed   |
   |---+----------------------------------+--------+------------|
   |   | BIOS type select 27C512 (64KB)   |  JP8   | pins 1 & 2 |
   |   |                                  |        |   closed   |
   |---+----------------------------------+--------+------------|
   |>> | Factory configured - do not      |  JP10  |    Open    |
   |   | alter                            |        |            |
   |---+----------------------------------+--------+------------|
   |>> | Monitor type select color        |  JP11  |   Closed   |
   |---+----------------------------------+--------+------------|
   |   | Monitor type select monochrome   |  JP11  |    Open    |
   |---+----------------------------------+--------+------------|
   |>> | Factory configured - do not      |  JP13  |    Open    |
   |   | alter                            |        |            |
   |---+----------------------------------+--------+------------|
   |>> | Factory configured - do not      |  JP14  |   Closed   |
   |   | alter                            |        |            |
   |---+----------------------------------+--------+------------|
   |>> | Floppy drive interface enabled   |  JP20  | pins 1 & 2 |
   |   |                                  |        |   closed   |
   |---+----------------------------------+--------+------------|
   |   | Floppy drive interface disabled  |  JP20  | pins 2 & 3 |
   |   |                                  |        |   closed   |
   |---+----------------------------------+--------+------------|
   |>> | Factory configured - do not      |  JP21  | pins 1 & 2 |
   |   | alter                            |        |   closed   |
   |---+----------------------------------+--------+------------|
   |>> | IDE interface enabled            |  JP22  | pins 1 & 2 |
   |   |                                  |        |   closed   |
   |---+----------------------------------+--------+------------|
   |   | IDE interface disabled           |  JP22  | pins 2 & 3 |
   |   |                                  |        |   closed   |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     DRAM CONFIGURATION                     |
   |------------------------------------------------------------|
   | Size |   Bank 0    |   Bank 1    |   Bank 2   |   Bank 3   |
   |------+-------------+-------------+------------+------------|
   | 1MB  | (1) 256K x  |    NONE     |    NONE    |    NONE    |
   |      |     36      |             |            |            |
   |------+-------------+-------------+------------+------------|
   | 2MB  | (1) 256K x  | (1) 256K x  |    NONE    |    NONE    |
   |      |     36      |     36      |            |            |
   |------+-------------+-------------+------------+------------|
   | 3MB  | (1) 256K x  | (1) 256K x  | (1) 256K x |    NONE    |
   |      |     36      |     36      |     36     |            |
   |------+-------------+-------------+------------+------------|
   | 4MB  | (1) 256K x  | (1) 256K x  | (1) 256K x | (1) 256K x |
   |      |     36      |     36      |     36     |     36     |
   |------+-------------+-------------+------------+------------|
   | 4MB  | (1) 1M x 36 |    NONE     |    NONE    |    NONE    |
   |------+-------------+-------------+------------+------------|
   | 5MB  | (1) 256K x  | (1) 1M x 36 |    NONE    |    NONE    |
   |      |     36      |             |            |            |
   |------+-------------+-------------+------------+------------|
   | 6MB  | (1) 256K x  | (1) 256K x  |  (1) 1M x  |    NONE    |
   |      |     36      |     36      |     36     |            |
   |------+-------------+-------------+------------+------------|
   | 8MB  | (1) 1M x 36 | (1) 1M x 36 |    NONE    |    NONE    |
   |------+-------------+-------------+------------+------------|
   | 9MB  | (1) 256K x  | (1) 1M x 36 |  (1) 1M x  |    NONE    |
   |      |     36      |             |     36     |            |
   |------+-------------+-------------+------------+------------|
   | 10MB | (1) 256K x  | (1) 256K x  |  (1) 1M x  |  (1) 1M x  |
   |      |     36      |     36      |     36     |     36     |
   |------+-------------+-------------+------------+------------|
   | 12MB | (1) 1M x 36 | (1) 1M x 36 |  (1) 1M x  |    NONE    |
   |      |             |             |     36     |            |
   |------+-------------+-------------+------------+------------|
   | 16MB | (1) 1M x 36 | (1) 1M x 36 |  (1) 1M x  |  (1) 1M x  |
   |      |             |             |     36     |     36     |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 SERIAL PORT CONFIGURATION                  |
   |------------------------------------------------------------|
   | Port 1 (C2)  |  Port 2  |    JP17    |   JP18   |   JP19   |
   |              |   (C1)   |            |          |          |
   |--------------+----------+------------+----------+----------|
   |>> |   COM1   |   COM2   | pins 1 & 2 | pins 1 & | pins 1 & |
   |   |          |          |   closed   | 2 closed | 2 closed |
   |---+----------+----------+------------+----------+----------|
   |   |   COM1   | Disabled | pins 1 & 2 | pins 2 & | pins 1 & |
   |   |          |          |   closed   | 3 closed | 2 closed |
   |---+----------+----------+------------+----------+----------|
   |   | Disabled |   COM2   | pins 2 & 3 | pins 1 & | pins 1 & |
   |   |          |          |   closed   | 2 closed | 2 closed |
   |---+----------+----------+------------+----------+----------|
   |   |  `COM2   | Disabled | pins 1 & 2 | pins 2 & | pins 2 & |
   |   |          |          |   closed   | 3 closed | 3 closed |
   |---+----------+----------+------------+----------+----------|
   |   |   COM2   |   COM1   | pins 1 & 2 | pins 1 & | pins 2 & |
   |   |          |          |   closed   | 2 closed | 3 closed |
   |---+----------+----------+------------+----------+----------|
   |   | Disabled |   COM1   | pins 2 & 3 | pins 1 & | pins 2 & |
   |   |          |          |   closed   | 2 closed | 3 closed |
   |---+----------+----------+------------+----------+----------|
   |   | Disabled | Disabled | pins 2 & 3 | pins 2 & |   Open   |
   |   |          |          |   closed   | 3 closed |          |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |  SERIAL PORTS 1 &AMP; 2 NORMAL/FORCED TRUE CONFIGURATION   |
   |------------------------------------------------------------|
   | Port 1  | Port 2 |     JP24      |    JP25    |    JP26    |
   |  (CN7)  | (JP31) |               |            |            |
   |---------+--------+---------------+------------+------------|
   | Normal  | Normal |  pins 1 & 2   | pins 1 & 2 | pins 1 & 2 |
   |         |        |    closed     |   closed   |   closed   |
   |---------+--------+---------------+------------+------------|
   | Forced  | Forced |  pins 2 & 3   | pins 2 & 3 | pins 2 & 3 |
   |  true   |  true  |    closed     |   closed   |   closed   |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |             SERIAL PORT DTE/DCE CONFIGURATION              |
   |------------------------------------------------------------|
   |          Function           |             JP30             |
   |-----------------------------+------------------------------|
   |>> | Serial Port 1 (CN7) DTE | Pins 1 & 2, 3 & 4, and 5 & 6 |
   |   |                         |            closed            |
   |---+-------------------------+------------------------------|
   |   | Serial Port 1 (CN7)DCE  | Pins 1 & 3, 2 & 4, and 6 & 8 |
   |   |                         |            closed            |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |             SERIAL PORT DTE/DCE CONFIGURATION              |
   |------------------------------------------------------------|
   |           Function           |            JP23             |
   |------------------------------+-----------------------------|
   |>> | Serial Port 2 (JP23) DTE |    Pins 7 & 8 and 9 & 10    |
   |   |                          |           closed            |
   |---+--------------------------+-----------------------------|
   |   | Serial Port 2 (JP23) DCE |    Pins 5 & 7 and 9 & 10    |
   |   |                          |           closed            |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |            PARALLEL PORT 1 (CN5) CONFIGURATION             |
   |------------------------------------------------------------|
   |   LPT    |   I/O    | Interrupt |  JP9   |  JP15  |  JP16  |
   |          | Address  |           |        |        |        |
   |----------+----------+-----------+--------+--------+--------|
   |  LPT 1   | 3BC-3BEh |   IRQ7    | pins 1 | pins 2 | pins 1 |
   |          |          |           |  & 2   |  & 3   |  & 2   |
   |----------+----------+-----------+--------+--------+--------|
   |  LPT 2   | 378-37Ah |   IRQ7    | pins 1 | pins 1 | pins 1 |
   |          |          |           |  & 2   |  & 2   |  & 2   |
   |----------+----------+-----------+--------+--------+--------|
   |  LPT 3   | 278-27Ah |   IRQ5    | pins 2 | pins 1 | pins 2 |
   |          |          |           |  & 3   |  & 2   |  & 3   |
   |----------+----------+-----------+--------+--------+--------|
   | Disabled |   N/A    |    N/A    |  N/A   | pins 2 | pins 2 |
   |          |          |           |        |  & 3   |  & 3   |
   |------------------------------------------------------------|
   | Note:Pins designated should be in the closed position.     |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     VRAM CONFIGURATION                     |
   |------------------------------------------------------------|
   |       Size       |        VRAM        |      Location      |
   |------------------+--------------------+--------------------|
   |      512KB       |     (4) 44256      |       Bank 0       |
   |------------------+--------------------+--------------------|
   |      1024KB      |     (8) 44256      |     Bank 0 & 1     |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 ONBOARD VGA CONFIGURATION                  |
   |------------------------------------------------------------|
   |     Mode     | IRQ |       JP2       |    JP3     |  JP12  |
   |--------------+-----+-----------------+------------+--------|
   |>> | Enabled  | 2/9 |   pins 2 & 3    | pins 1 & 2 | Closed |
   |   |          |     |     closed      |   closed   |        |
   |---+----------+-----+-----------------+------------+--------|
   |   | Disabled | 2/9 |     Closed      |    Open    |  Open  |
   +------------------------------------------------------------+