DISTRIBUTED PROCESSING TECHNOLOGY
=================================

   PM2021A/90, PM2021A/95

   +------------------------------------------------------------+
   +------------------------------------------------------------+

   Data bus:     16-bit, ISA (PM2021A/9x)                         
   Size:         Half-length, full-height card                    
   Hard drive    Up to seven SCSI drives                          
   supported:    
   Floppy drives Two 360KB, 720KB, 1.2MB, or 1.44MB drives        
   supported:    (PM2x2x/95 only)                                 

<gopher://bitreich.org/I/th99/c/C-D/20317-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   |                   Function                   |  Location   |
   |----------------------------------------------+-------------|
   | CM4000 Cache Module Connector                |     P1      |
   |----------------------------------------------+-------------|
   | CM4000 Cache Module Connector                |     P2      |
   |----------------------------------------------+-------------|
   | DM4000 Disk Array Module Connector           |     P5      |
   |----------------------------------------------+-------------|
   | 4-pin connector-Drive active LED             |     P6      |
   |----------------------------------------------+-------------|
   | DM400 Disk Array Module Connector            |     P7      |
   |----------------------------------------------+-------------|
   | 34-pin control cable connector-floppy drive  |     P8      |
   |----------------------------------------------+-------------|
   | 50-pin SCSI connector - internal             |     P10     |
   |----------------------------------------------+-------------|
   | 50-pin SCSI connector - external             |     J11     |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     DMA TRANSFER RATE                      |
   |------------------------------------------------------------|
   |      Speed       | Jumper Y12  | Jumper Y13  | Jumper Y14  |
   |------------------+-------------+-------------+-------------|
   |   |   10MB/sec   |    open     |    open     |    open     |
   |---+--------------+-------------+-------------+-------------|
   |   |   8MB/sec    |   closed    |    open     |    open     |
   |---+--------------+-------------+-------------+-------------|
   |   | 6.667MB/sec  |    open     |   closed    |    open     |
   |---+--------------+-------------+-------------+-------------|
   |   |  5.7MB/sec   |   closed    |   closed    |    open     |
   |---+--------------+-------------+-------------+-------------|
   |>> |  5.0MB/sec   |    open     |    open     |   closed    |
   |---+--------------+-------------+-------------+-------------|
   |   |  4.4MB/sec   |   closed    |    open     |   closed    |
   |---+--------------+-------------+-------------+-------------|
   |   |  4.0MB/sec   |    open     |   closed    |   closed    |
   |---+--------------+-------------+-------------+-------------|
   |   |  3.0MB/sec   |   closed    |   closed    |   closed    |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                        SCSI ADDRESS                        |
   |------------------------------------------------------------|
   |  SCSI I.D.   |  Jumper Y18   |  Jumper Y25  |  Jumper Y26  |
   |--------------+---------------+--------------+--------------|
   |     |   0    |     open      |     open     |     open     |
   |-----+--------+---------------+--------------+--------------|
   |     |   1    |     open      |    closed    |     open     |
   |-----+--------+---------------+--------------+--------------|
   |     |   2    |    closed     |     open     |     open     |
   |-----+--------+---------------+--------------+--------------|
   |     |   3    |    closed     |    closed    |     open     |
   |-----+--------+---------------+--------------+--------------|
   |     |   4    |     open      |     open     |    closed    |
   |-----+--------+---------------+--------------+--------------|
   |     |   5    |     open      |    closed    |    closed    |
   |-----+--------+---------------+--------------+--------------|
   |     |   6    |    closed     |     open     |    closed    |
   |-----+--------+---------------+--------------+--------------|
   |>>   |   7    |    closed     |    closed    |    closed    |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     INTERRUPT REQUEST                      |
   |------------------------------------------------------------|
   |          IRQ           |       Y29       |       Y30       |
   |------------------------+-----------------+-----------------|
   |   |      Disabled      |      open       |      open       |
   |---+--------------------+-----------------+-----------------|
   |   |       IRQ12        |      open       |     closed      |
   |---+--------------------+-----------------+-----------------|
   |>> |       IRQ15        |     closed      |      open       |
   |---+--------------------+-----------------+-----------------|
   |   |       IRQ14        |     closed      |     closed      |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                        DMA CHANNEL                         |
   |------------------------------------------------------------|
   |         DRQ         |        Y31        |       Y32        |
   |---------------------+-------------------+------------------|
   |   |      DRQ0       |       open        |       open       |
   |---+-----------------+-------------------+------------------|
   |   |      DRQ7       |       open        |      closed      |
   |---+-----------------+-------------------+------------------|
   |   |      DRQ6       |      closed       |       open       |
   |---+-----------------+-------------------+------------------|
   |>> |      DRQ5       |      closed       |      closed      |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                      I/O PORT ADDRESS                      |
   |------------------------------------------------------------|
   |       Address       |        Y33        |       Y35        |
   |---------------------+-------------------+------------------|
   |   |      230h       |       open        |       open       |
   |---+-----------------+-------------------+------------------|
   |>> |      170h       |       open        |      closed      |
   |---+-----------------+-------------------+------------------|
   |   |      330h       |      closed       |       open       |
   |---+-----------------+-------------------+------------------|
   |   |      1F0h       |      closed       |      closed      |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                        BIOS ADDRESS                        |
   |------------------------------------------------------------|
   |        Address         |       Y36       |       Y37       |
   |------------------------+-----------------+-----------------|
   |   |      Disabled      |      open       |      open       |
   |---+--------------------+-----------------+-----------------|
   |   |       DC00h        |      open       |     closed      |
   |---+--------------------+-----------------+-----------------|
   |   |       D800h        |     closed      |      open       |
   |---+--------------------+-----------------+-----------------|
   |>> |       C800h        |     closed      |     closed      |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 USER CONFIGURABLE SETTINGS                 |
   |------------------------------------------------------------|
   |               Function                | Location | Setting |
   |---------------------------------------+----------+---------|
   |>> | DMA duty cycle is fast            |   Y15    |  open   |
   |---+-----------------------------------+----------+---------|
   |   | DMA duty cycle is slow            |   Y15    | closed  |
   |---+-----------------------------------+----------+---------|
   |>> | SCSI termination enabled          |   Y16    | closed  |
   |---+-----------------------------------+----------+---------|
   |   | SCSI termination disabled         |   Y16    |  open   |
   |---+-----------------------------------+----------+---------|
   |>> | Address LInes SA17-19 and LA17-19 |   Y19    | closed  |
   |   | driven                            |          |         |
   |---+-----------------------------------+----------+---------|
   |   | Only Address LInes LA17-19 driven |   Y19    |  open   |
   |---+-----------------------------------+----------+---------|
   |>> | Floppy drive enabled              |   Y20    | closed  |
   |---+-----------------------------------+----------+---------|
   |   | Floppy drive disabled             |   Y20    |  open   |
   |---+-----------------------------------+----------+---------|
   |>> | Bus Mastering enabled             |   Y24    | closed  |
   |---+-----------------------------------+----------+---------|
   |   | Bus Mastering disabled            |   Y24    |  open   |
   |---+-----------------------------------+----------+---------|
   |>> | BIOS ROM size is 8K               |   Y38    |  open   |
   |---+-----------------------------------+----------+---------|
   |   | BIOS ROM size is 16K              |   Y38    | closed  |
   |---+-----------------------------------+----------+---------|
   |>> | External SCSI cable detection     |   Y39    |  open   |
   |   | disabled                          |          |         |
   |---+-----------------------------------+----------+---------|
   |   | External SCSI cable detection     |   Y39    | closed  |
   |   | enabled*                          |          |         |
   |---+-----------------------------------+----------+---------|
   |>> | Controller supplies TERMPWR to    |   Y50    | closed  |
   |   | SCSI interface 26                 |          |         |
   |---+-----------------------------------+----------+---------|
   |   | TERMPWR not supplied to SCSI      |   Y50    |  open   |
   |   | Interface 26                      |          |         |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                        STATUS LED'S                        |
   |------------------------------------------------------------|
   |      LED       |                Definition                 |
   |----------------+-------------------------------------------|
   |     LED 1      | Busy                                      |
   |----------------+-------------------------------------------|
   |     LED 2      | Computer Bus Transfer to Adapter          |
   |----------------+-------------------------------------------|
   |     LED 3      | Computer Bus Transfer from Adapter        |
   |----------------+-------------------------------------------|
   |     LED 4      | Cache Hit                                 |
   |----------------+-------------------------------------------|
   |     LED 5      | Disk Read-Ahead Active                    |
   |----------------+-------------------------------------------|
   |     LED 6      | Disk Read                                 |
   |----------------+-------------------------------------------|
   |     LED 7      | Disk Write                                |
   |----------------+-------------------------------------------|
   |     LED 8      | Adapter Reset                             |
   |----------------+-------------------------------------------|
   |     LED 9      | Interrupt Pending to Computer             |
   |----------------+-------------------------------------------|
   |     LED 10     | DRQ Asserted to Computer                  |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |               MISCELLANEOUS TECHNICAL NOTES                |
   |------------------------------------------------------------|
   |   Detection of an external SCSI cable limits the maximum   |
   |             SCSI bus transfer rate to 5MB/sec.             |
   |                                                            |
   |           The function of Jumper Y34 is unknown.           |
   +------------------------------------------------------------+