EMULEX CORPORATION
==================

   MD23, MD24

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

   Data bus: None (SCSI to ESDI interface)

   Size: Drive card

   Hard drives supported:  SCSI to four RLL ESDI drives

   Floppy drives supported: None

<gopher://bitreich.org/I/th99/c/E-H/20095-1.png>
   

   +------------------------------------------------------------+
   |                 CONNECTIONS                  | MD23 | MD24 |
   |----------------------------------------------+-------------|
   | 34-pin control cable             | P1  | P1  |             |
   | connector-hard drive             |     |     |             |
   |----------------------------------+-----+-----|             |
   | 20-pin data cable                | J2  | J2  |             |
   | connector-drive 0                |     |     |             |
   |----------------------------------+-----+-----|             |
   | 20-pin data cable                | J3  | J3  |             |
   | connector-drive 1                |     |     |             |
   |----------------------------------+-----+-----|             |
   | 10-pin connector-user panel      | J4  | J6  |             |
   | (factory use only)               |     |     |             |
   |----------------------------------+-----+-----|             |
   | 14-pin connector-test (factory   | J5  | J8  |             |
   | use only)                        |     |     |             |
   |----------------------------------+-----+-----|             |
   | 50-pin SCSI connector- to host   | J6  | J9  |             |
   | adapter                          |     |     |             |
   |----------------------------------+-----+-----|             |
   | 4-pin connector-DC power         | J7  | J10 |             |
   |----------------------------------+-----+-----|             |
   | 20-pin data cable                | J8  | J4  |             |
   | connector-drive 2                |     |     |             |
   |----------------------------------+-----+-----|             |
   | 20-pin data cable                | J9  | J5  |             |
   | connector-drive 3                |     |     |             |
   |----------------------------------+-----+-----|             |
   | 10-pin connector-user panel      | J10 | J7  |             |
   | (factory use only)               |     |     |             |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 USER CONFIGURABLE SETTINGS                 |
   |------------------------------------------------------------|
   |             Function              |   Location   | Setting |
   |-----------------------------------+--------------+---------|
   |   | Not used                      | SW1/switch 4 |   N/A   |
   |---+-------------------------------+--------------+---------|
   |>> | Sector size set to 512 bytes  | SW1/switch 5 |  open   |
   |---+-------------------------------+--------------+---------|
   |   | Sector size set to 256 bytes  | SW1/switch 5 | closed  |
   |---+-------------------------------+--------------+---------|
   |>> | Spindle motor starts on       | SW1/switch 6 |  open   |
   |   | power-up                      |              |         |
   |---+-------------------------------+--------------+---------|
   |   | Spindle motor starts on       | SW1/switch 6 | closed  |
   |   | command                       |              |         |
   |---+-------------------------------+--------------+---------|
   |>> | Soft error reporting enabled  | SW1/switch 7 |  open   |
   |---+-------------------------------+--------------+---------|
   |   | Soft error reporting disabled | SW1/switch 7 | closed  |
   |---+-------------------------------+--------------+---------|
   |>> | SCSI parity check disabled    | SW1/switch 8 |  open   |
   |---+-------------------------------+--------------+---------|
   |   | SCSI parity check enabled     | SW1/switch 8 | closed  |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                        SCSI ADDRESS                        |
   |------------------------------------------------------------|
   |  SCSI ID   | SW1/switch 1  | SW1/switch 2  | SW1/switch 3  |
   |------------+---------------+---------------+---------------|
   |    |   0   |      off      |      off      |      off      |
   |----+-------+---------------+---------------+---------------|
   |    |   1   |      on       |      off      |      off      |
   |----+-------+---------------+---------------+---------------|
   |    |   2   |      off      |      on       |      off      |
   |----+-------+---------------+---------------+---------------|
   |    |   3   |      on       |      on       |      off      |
   |----+-------+---------------+---------------+---------------|
   |    |   4   |      off      |      off      |      on       |
   |----+-------+---------------+---------------+---------------|
   |    |   5   |      on       |      off      |      on       |
   |----+-------+---------------+---------------+---------------|
   |    |   6   |      off      |      on       |      on       |
   |----+-------+---------------+---------------+---------------|
   |>>  |   7   |      on       |      on       |      on       |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |               MISCELLANEOUS TECHNICAL NOTES                |
   |------------------------------------------------------------|
   |  Note: For the SCSI termination power option, a # 1N5817   |
   |   diode must be installed at socket CR2 and JP1 must be    |
   |                           closed                           |
   +------------------------------------------------------------+