EVEREX SYSTEMS, INC.
====================

   EV-391

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

   Data bus: 8-bit, ISA

   Size: Full-length, full-height card

   Hard drives supported:  Two MFM ST506/412 drives

   Floppy drives supported: None

<gopher://bitreich.org/I/th99/c/E-H/20104-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   |                   Function                   |  Location   |
   |----------------------------------------------+-------------|
   | 34-pin control cable connector-hard drive    |     J1      |
   |----------------------------------------------+-------------|
   | 20-pin data cable connector-drive 0          |     J2      |
   |----------------------------------------------+-------------|
   | 20-pin data cable connector-drive 1          |     J3      |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 USER CONFIGURABLE SETTINGS                 |
   |------------------------------------------------------------|
   |             Function              | Location  |  Setting   |
   |-----------------------------------+-----------+------------|
   |>> | Normal operation              |    W1     | pins 1 & 2 |
   |   |                               |           |   closed   |
   |---+-------------------------------+-----------+------------|
   |   | Factory test                  |    W1     | pins 2 & 3 |
   |   |                               |           |   closed   |
   |---+-------------------------------+-----------+------------|
   |>> | Normal operation              |    W2     | pins 1 & 2 |
   |   |                               |           |   closed   |
   |---+-------------------------------+-----------+------------|
   |   | Factory test                  |    W2     | pins 2 & 3 |
   |   |                               |           |   closed   |
   |---+-------------------------------+-----------+------------|
   |>> | BIOS enabled                  |    W3     |   closed   |
   |---+-------------------------------+-----------+------------|
   |   | BIOS disabled                 |    W3     |    open    |
   |---+-------------------------------+-----------+------------|
   |>> | I/O port address 320h         |    W4     | pins 2 & 3 |
   |   |                               |           |   closed   |
   |---+-------------------------------+-----------+------------|
   |   | I/O port address 324h         |    W4     | pins 1 & 2 |
   |   |                               |           |   closed   |
   |---+-------------------------------+-----------+------------|
   |>> | BIOS size 32K or 64K          |    W5     | pins 1 & 2 |
   |   |                               |           |   closed   |
   |---+-------------------------------+-----------+------------|
   |   | BIOS size 16K                 |    W5     | pins 2 & 3 |
   |   |                               |           |   closed   |
   |---+-------------------------------+-----------+------------|
   |>> | 8 Head hard drive with RWC    |    W6     | pins 2 & 3 |
   |   | (Head Select 3 invalid)       |           |   closed   |
   |---+-------------------------------+-----------+------------|
   |   | 16 head hard drive supported  |    W6     | pins 1 & 2 |
   |   | (Head Select 3 valid)         |           |   closed   |
   |---+-------------------------------+-----------+------------|
   |>> | Hard drive interrupt is IRQ5  |    W7     | pins 1 & 2 |
   |   |                               |           |   closed   |
   |---+-------------------------------+-----------+------------|
   |   | Hard drive interrupt is IRQ2  |    W7     | pins 2 & 3 |
   |   |                               |           |   closed   |
   |------------------------------------------------------------|
   | Note:SW1/switches 5, 6, 7, and 8 are reserved for BIOS     |
   | functions and should not be altered.                       |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                BIOS DRIVE TYPE TABLE - SW1                 |
   |                                                            |
   |                   (FOR EPROM REV. 3.92A)                   |
   |------------------------------------------------------------|
   |# |Jumper 1 |Jumper 2 |Jumper 3 |Jumper 4 |Cap. |Hds. |Cyls.|
   |  |         |         |         |         |     |     |     |
   |  | Drv. 1  | Drv. 1  | Drv. 0  | Drv. 0  |     |     |     |
   |--+---------+---------+---------+---------+-----+-----+-----|
   |0 | closed  | closed  | closed  | closed  |42MB |  5  | 977 |
   |--+---------+---------+---------+---------+-----+-----+-----|
   |1 |  open   | closed  |  open   | closed  |21MB |  4  | 615 |
   |--+---------+---------+---------+---------+-----+-----+-----|
   |2 | closed  |  open   | closed  |  open   |10MB |  2  | 615 |
   |--+---------+---------+---------+---------+-----+-----+-----|
   |3 |  open   |  open   |  open   |  open   |10MB |  4  | 306 |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |               MISCELLANEOUS TECHNICAL NOTES                |
   |------------------------------------------------------------|
   |  This controller has a built-in low-level format program.  |
   |  To enter the program run the DEBUG utility supplied with  |
   |           DOS and at the prompt enter: G=C800:5.           |
   +------------------------------------------------------------+