ACER, INC.
==========

   L50

   +------------------------------------------------------------+
   |------------------------------------------------------------|
   | Data bus:     | 32-bit VL-bus                              |
   |---------------+--------------------------------------------|
   | Size:         | Three-quarter length, full-height card     |
   |---------------+--------------------------------------------|
   | Hard drive    | Four IDE(AT) drives                        |
   | supported:    |                                            |
   |---------------+--------------------------------------------|
   | Floppy drives | Two 360KB, 720KB, 1.2MB, 1.44MB, or 2.88MB |
   | supported:    | drives                                     |
   +------------------------------------------------------------+

<gopher://bitreich.org/I/th99/c/A-B/20848-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   |                 Function                 |    Location     |
   |------------------------------------------+-----------------|
   | 40-pin primary IDE(AT) connector         |       CN1       |
   |------------------------------------------+-----------------|
   | 40-pin secondary IDE(AT) connector       |       CN2       |
   |------------------------------------------+-----------------|
   | 34-pin cable connector - floppy drive    |       CN3       |
   |------------------------------------------+-----------------|
   | 10-pin serial port 1                     |       CN4       |
   |------------------------------------------+-----------------|
   | 10-pin serial port 2                     |       CN5       |
   |------------------------------------------+-----------------|
   | 16-pin game port                         |       CN6       |
   |------------------------------------------+-----------------|
   | 15-pin video port                        |       CN7       |
   |------------------------------------------+-----------------|
   | 25-pin parallel port                     |       CN8       |
   |------------------------------------------+-----------------|
   | VESA feature connector                   |       CN9       |
   |------------------------------------------+-----------------|
   | 4-pin connector - drive active LED       |      JP28       |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     VGA CONFIGURATION                      |
   |------------------------------------------------------------|
   |      Mode      |         JP4         |         JP5         |
   |----------------+---------------------+---------------------|
   |>> |  Enabled   |  pins 1 & 2 closed  |  pins 1 & 2 closed  |
   |---+------------+---------------------+---------------------|
   |   |  Disabled  |  pins 2 & 3 closed  |  pins 2 & 3 closed  |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 USER CONFIGURABLE SETTINGS                 |
   |------------------------------------------------------------|
   |             Function              |   Location   | Setting |
   |-----------------------------------+--------------+---------|
   |>> | IRQ9 disabled                 | JP3/pins 1 & | closed  |
   |   |                               |      2       |         |
   |---+-------------------------------+--------------+---------|
   |   | IRQ9 enabled                  | JP3/pins 2 & | closed  |
   |   |                               |      3       |         |
   |---+-------------------------------+--------------+---------|
   |>> | Primary IDE(AT) interface     | JP6/pins 1 & | closed  |
   |   | enabled                       |      2       |         |
   |---+-------------------------------+--------------+---------|
   |   | Primary IDE(AT) interface     | JP6/pins 2 & | closed  |
   |   | disabled                      |      3       |         |
   |---+-------------------------------+--------------+---------|
   |>> | Floppy drive interface        | JP11/pins 1  | closed  |
   |   | enabled                       |     & 2      |         |
   |---+-------------------------------+--------------+---------|
   |   | Floppy drive interface        | JP11/pins 2  | closed  |
   |   | disabled                      |     & 3      |         |
   |---+-------------------------------+--------------+---------|
   |>> | Ignores cable select          | JP12/pins 1  | closed  |
   |   | configuration for floppy      |     & 2      |         |
   |   | drives                        |              |         |
   |---+-------------------------------+--------------+---------|
   |   | Checks for cable select       | JP12/pins 2  | closed  |
   |   | configuration                 |     & 3      |         |
   |---+-------------------------------+--------------+---------|
   |>> | Game port enabled             | JP13/pins 1  | closed  |
   |   |                               |     & 2      |         |
   |---+-------------------------------+--------------+---------|
   |   | Game port disabled            | JP13/pins 2  | closed  |
   |   |                               |     & 3      |         |
   |---+-------------------------------+--------------+---------|
   |>> | Parallel port IRQ 7 select    | JP18/pins 1  | closed  |
   |   |                               |     & 2      |         |
   |---+-------------------------------+--------------+---------|
   |   | Parallel port IRQ 5 select    | JP18/pins 2  | closed  |
   |   |                               |     & 3      |         |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |              PARALLEL PORT ADDRESS SELECTION               |
   |------------------------------------------------------------|
   |       LPT        |        JP14        |        JP15        |
   |------------------+--------------------+--------------------|
   |>> | LPT1 (378h)  | pins 1 & 2 closed  | pins 1 & 2 closed  |
   |---+--------------+--------------------+--------------------|
   |   | LPT2 (278h)  | pins 1 & 2 closed  | pins 2 & 3 closed  |
   |---+--------------+--------------------+--------------------|
   |   | LPT3 (3BCh)  | pins 2 & 3 closed  | pins 2 & 3 closed  |
   |---+--------------+--------------------+--------------------|
   |   |   Disabled   | pins 2 & 3 closed  | pins 1 & 2 closed  |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |              SERIAL PORT 1 ADDRESS SELECTION               |
   |------------------------------------------------------------|
   |       COM        |        JP21        |        JP22        |
   |------------------+--------------------+--------------------|
   |>> | COM1 (3F8h)  | pins 1 & 2 closed  | pins 1 & 2 closed  |
   |---+--------------+--------------------+--------------------|
   |   | COM2 (2F8h)  | pins 1 & 2 closed  | pins 2 & 3 closed  |
   |---+--------------+--------------------+--------------------|
   |   | COM3 (3E8h)  | pins 2 & 3 closed  | pins 1 & 2 closed  |
   |---+--------------+--------------------+--------------------|
   |   |   Disabled   | pins 2 & 3 closed  | pins 2 & 3 closed  |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |              SERIAL PORT 2 ADDRESS SELECTION               |
   |------------------------------------------------------------|
   |       COM        |        JP23        |        JP24        |
   |------------------+--------------------+--------------------|
   |>> | COM2 (2F8h)  | pins 1 & 2 closed  | pins 1 & 2 closed  |
   |---+--------------+--------------------+--------------------|
   |   | COM1 (3F8h)  | pins 1 & 2 closed  | pins 2 & 3 closed  |
   |---+--------------+--------------------+--------------------|
   |   | COM4 (2E8h)  | pins 2 & 3 closed  | pins 1 & 2 closed  |
   |---+--------------+--------------------+--------------------|
   |   |   Disabled   | pins 2 & 3 closed  | pins 2 & 3 closed  |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |             SERIAL PORT 1 INTERRUPT SELECTION              |
   |------------------------------------------------------------|
   |   IRQ    | JP25/Pins 1 & 2 | JP26/Pins 1 & | JP27/Pins 1 & |
   |          |                 |       2       |       2       |
   |----------+-----------------+---------------+---------------|
   |>> | IRQ4 |     closed      |     open      |     open      |
   |---+------+-----------------+---------------+---------------|
   |   | IRQ3 |      open       |    closed     |     open      |
   |---+------+-----------------+---------------+---------------|
   |   | IRQ5 |      open       |     open      |    closed     |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |             SERIAL PORT 2 INTERRUPT SELECTION              |
   |------------------------------------------------------------|
   |   IRQ    | JP25/Pins 2 & 3 | JP26/Pins 2 & | JP27/Pins 2 & |
   |          |                 |       3       |       3       |
   |----------+-----------------+---------------+---------------|
   |>> | IRQ3 |      open       |    closed     |     open      |
   |---+------+-----------------+---------------+---------------|
   |   | IRQ4 |     closed      |     open      |     open      |
   |---+------+-----------------+---------------+---------------|
   |   | IRQ5 |      open       |     open      |    closed     |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |              PARALLEL PORT MODE CONFIGURATION              |
   |------------------------------------------------------------|
   |      Mode      |        JP16         |        JP17         |
   |----------------+---------------------+---------------------|
   |>> |    SPP     |  pins 1 & 2 closed  |  pins 1 & 2 closed  |
   |---+------------+---------------------+---------------------|
   |   |    EPP     |  pins 1 & 2 closed  |  pins 2 & 3 closed  |
   |---+------------+---------------------+---------------------|
   |   |    ECP     |  pins 2 & 3 closed  |  pins 1 & 2 closed  |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 DMA SELECTION FOR ECP MODE                 |
   |------------------------------------------------------------|
   |    Channel     |        JP19         |        JP20         |
   |----------------+---------------------+---------------------|
   |>> |   DMA 3    |  pins 1 & 2 closed  |  pins 1 & 2 closed  |
   |---+------------+---------------------+---------------------|
   |   |   DMA 1    |  pins 2 & 3 closed  |  pins 2 & 3 closed  |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     MEMORY ADDRESSING                      |
   |------------------------------------------------------------|
   |  Linear Address  |        JP1         |        JP2         |
   |------------------+--------------------+--------------------|
   |>>    |   64MB    | pins 1 & 2 closed  | pins 1 & 2 closed  |
   |------+-----------+--------------------+--------------------|
   |      |    2GB    | pins 2 & 3 closed  | pins 2 & 3 closed  |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |              SECONDARY IDE ADDRESS SELECTION               |
   |------------------------------------------------------------|
   |     Address      |        JP7         |        JP8         |
   |------------------+--------------------+--------------------|
   |>> |  Secondary   | pins 1 & 2 closed  | pins 1 & 2 closed  |
   |---+--------------+--------------------+--------------------|
   |   |   Primary    | pins 1 & 2 closed  | pins 2 & 3 closed  |
   |---+--------------+--------------------+--------------------|
   |   |   Disabled   | pins 2 & 3 closed  | pins 2 & 3 closed  |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |             SECONDARY IDE INTERRUPT SELECTION              |
   |------------------------------------------------------------|
   |       IRQ        |        JP9         |        JP10        |
   |------------------+--------------------+--------------------|
   |>> |      15      | pins 1 & 2 closed  | pins 1, 2 & 3 open |
   |---+--------------+--------------------+--------------------|
   |   |      10      | pins 1, 2 & 3 open | pins 1 & 2 closed  |
   |---+--------------+--------------------+--------------------|
   |   |      12      | pins 1, 2 & 3 open | pins 2 & 3 closed  |
   |---+--------------+--------------------+--------------------|
   |   |      14      | pins 2 & 3 closed  | pins 1, 2 & 3 open |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     DRAM CONFIGURATION                     |
   |------------------------------------------------------------|
   |       Size       |       Bank 0       |       Bank 1       |
   |------------------+--------------------+--------------------|
   |       1MB        |    (8) 256K x 4    |        None        |
   |------------------+--------------------+--------------------|
   |       2MB        |    (8) 256K x 4    |   (2) 256K x 16    |
   +------------------------------------------------------------+