DATA TECHNOLOGY CORPORATION
===========================

   DTC520DB

   Data Bus                SASI                                   
   Card Size               146 x 203mm                            
   Hard Drives Supported   Two ST506/412-MFM devices              
   Floppy Drives Supported Four 360KB drives                      

<gopher://bitreich.org/I/th99/c/C-D/21366-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   |       Function        | Label |      Function      | Label |
   |-----------------------+-------+--------------------+-------|
   | 50-pin SASI connector |  J1   | 20-pin hard drive  |  J4   |
   | - to SASI controller  |       | data cable         |       |
   |-----------------------+-------+--------------------+-------|
   | 34-pin hard drive     |  J2   | 34-pin cable       |  J7   |
   | control cable         |       | connector - floppy |       |
   |                       |       | drive              |       |
   |-----------------------+-------+--------------------+-------|
   | 20-pin hard drive     |  J3   | 4-pin DC power in  |  J10  |
   | data cable            |       |                    |       |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 USER CONFIGURABLE SETTINGS                 |
   |------------------------------------------------------------|
   |                Setting                 | Label | Position  |
   |----------------------------------------+-------+-----------|
   |>> | SASI bus terminated                |  T1   | Installed |
   |---+------------------------------------+-------+-----------|
   |   | SASI bus not terminated            |  T1   |    Not    |
   |   |                                    |       | installed |
   |---+------------------------------------+-------+-----------|
   |>> | SASI bus parity enabled            |  W1   | Pins 1 &  |
   |   |                                    |       | 2 closed  |
   |---+------------------------------------+-------+-----------|
   |   | SASI bus parity disabled           |  W1   | Pins 2 &  |
   |   |                                    |       | 3 closed  |
   |---+------------------------------------+-------+-----------|
   |>> | Logical Unit Number 0 is assigned  |  W5   |   Open    |
   |   | to hard drive                      |       |           |
   |---+------------------------------------+-------+-----------|
   |   | Logical Unit Number 0 is assigned  |  W5   |  Closed   |
   |   | to floppy drive                    |       |           |
   |---+------------------------------------+-------+-----------|
   |>> | Logical Unit Number 1 is assigned  |  W6   |  Closed   |
   |   | to floppy drive                    |       |           |
   |---+------------------------------------+-------+-----------|
   |   | Logical Unit Number 1 is assigned  |  W6   |   Open    |
   |   | to hard drive                      |       |           |
   |---+------------------------------------+-------+-----------|
   |>> | Factory configured - do not alter  |  W7   |  Closed   |
   |---+------------------------------------+-------+-----------|
   |>> | Factory configured - do not alter  |  W8   |  Closed   |
   |---+------------------------------------+-------+-----------|
   |>> | Motor On signal normal             |  W14  |   Open    |
   |---+------------------------------------+-------+-----------|
   |   | Motor On signal forced high        |  W14  |  Closed   |
   |---+------------------------------------+-------+-----------|
   |>> | Floppy drive not always considered |  W15  |   Open    |
   |   | ready                              |       |           |
   |---+------------------------------------+-------+-----------|
   |   | Floppy drive always considered     |  W15  |  Closed   |
   |   | ready                              |       |           |
   |---+------------------------------------+-------+-----------|
   |>> | Factory configured - do not alter  |  W31  |   Open    |
   |---+------------------------------------+-------+-----------|
   |>> | Factory configured - do not alter  |  W32  | Pins 1 &  |
   |   |                                    |       | 2 closed  |
   +------------------------------------------------------------+

   +---------------------------------------------------------------+
   |                  SASI BUS ADDRESS SELECTION                   |
   |---------------------------------------------------------------|
   |Setting| W0/A | W0/B | W0/C | W0/D | W0/E | W0/F | W0/G | W0/H |
   |-------+------+------+------+------+------+------+------+------|
   |>>  | 0 |Closed| Open | Open | Open | Open | Open | Open | Open |
   |---+---+------+------+------+------+------+------+------+------|
   |   | 1 | Open |Closed| Open | Open | Open | Open | Open | Open |
   |---+---+------+------+------+------+------+------+------+------|
   |   | 2 | Open | Open |Closed| Open | Open | Open | Open | Open |
   |---+---+------+------+------+------+------+------+------+------|
   |   | 3 | Open | Open | Open |Closed| Open | Open | Open | Open |
   |---+---+------+------+------+------+------+------+------+------|
   |   | 4 | Open | Open | Open | Open |Closed| Open | Open | Open |
   |---+---+------+------+------+------+------+------+------+------|
   |   | 5 | Open | Open | Open | Open | Open |Closed| Open | Open |
   |---+---+------+------+------+------+------+------+------+------|
   |   | 6 | Open | Open | Open | Open | Open | Open |Closed| Open |
   |---+---+------+------+------+------+------+------+------+------|
   |   | 7 | Open | Open | Open | Open | Open | Open | Open |Closed|
   +---------------------------------------------------------------+

   +------------------------------------------------------------+
   |                   SECTOR SIZE SELECTION                    |
   |------------------------------------------------------------|
   |        Setting         |       W3        |       W4        |
   |------------------------+-----------------+-----------------|
   |   |     128 bytes      |      Open       |      Open       |
   |---+--------------------+-----------------+-----------------|
   |>> |     256 bytes      |     Closed      |      Open       |
   |---+--------------------+-----------------+-----------------|
   |   |     512 bytes      |      Open       |     Closed      |
   |---+--------------------+-----------------+-----------------|
   |   |     1024 bytes     |     Closed      |     Closed      |
   +------------------------------------------------------------+