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       # IOMEGA CORPORATION
       
          PC2/50, PC2B/50
       
          +------------------------------------------------------------+
          |------------------------------------------------------------|
          | Data bus:                | 8-bit ISA                       |
          |--------------------------+---------------------------------|
          | Size:                    | Half-length, full-height card   |
          |--------------------------+---------------------------------|
          | Hard drive supported:    | None                            |
          |--------------------------+---------------------------------|
          | Floppy drives supported: | Two Bernoulli Box drives        |
          +------------------------------------------------------------+
       
 (IMG) IMG 1
          
       
          +------------------------------------------------------------+
          |                        CONNECTIONS                         |
          |------------------------------------------------------------|
          |                    Function                     | Location |
          |-------------------------------------------------+----------|
          | 34-pin Bernoulli Box connector - external drive |   CN1    |
          |-------------------------------------------------+----------|
          | 50-pin Bernoulli Box connector - internal drive |   CN2    |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                 USER CONFIGURABLE SETTINGS                 |
          |------------------------------------------------------------|
          |               Function                | Location | Setting |
          |---------------------------------------+----------+---------|
          | » | DMA channel 3 select              |   SW3    |   off   |
          |---+-----------------------------------+----------+---------|
          |   | DMA channel 1 select              |   SW3    |   on    |
          |---+-----------------------------------+----------+---------|
          | » | DMA enabled                       |   SW4    |   off   |
          |---+-----------------------------------+----------+---------|
          |   | PIO (Programmed Input/Ouput)      |   SW4    |   on    |
          |   | enabled                           |          |         |
          |---+-----------------------------------+----------+---------|
          | » | IRQ5 select                       |   SW6    |   off   |
          |---+-----------------------------------+----------+---------|
          |   | IRQ7 select                       |   SW6    |   on    |
          |---+-----------------------------------+----------+---------|
          | » | Factory configured - do not alter |   SW7    |   off   |
          |---+-----------------------------------+----------+---------|
          | » | Two 10MB Bernoulli drives in      |   SW8    |   off   |
          |   | system                            |          |         |
          |---+-----------------------------------+----------+---------|
          |   | One 10MB Bernoulli drive in       |   SW8    |   on    |
          |   | system                            |          |         |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                   PORT ADDRESS SELECTION                   |
          |------------------------------------------------------------|
          |      Address      |     SW1     |     SW2     |    SW5     |
          |-------------------+-------------+-------------+------------|
          | » |     340h      |     on      |     on      |    off     |
          |---+---------------+-------------+-------------+------------|
          |   |     348h      |     on      |     on      |     on     |
          |---+---------------+-------------+-------------+------------|
          |   |     350h      |     off     |     on      |    off     |
          |---+---------------+-------------+-------------+------------|
          |   |     358h      |     off     |     on      |     on     |
          |---+---------------+-------------+-------------+------------|
          |   |     360h      |     on      |     off     |    off     |
          |---+---------------+-------------+-------------+------------|
          |   |     368h      |     on      |     off     |     on     |
          |---+---------------+-------------+-------------+------------|
          |   |     370h      |     off     |     off     |    off     |
          |---+---------------+-------------+-------------+------------|
          |   |   Disabled    |     off     |     off     |    off     |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |            ROM ADDRESS SELECTION (PC2B/50 ONLY)            |
          |------------------------------------------------------------|
          |          Address           |  JP1  |  JP2  |  JP3  |  JP4  |
          |----------------------------+-------+-------+-------+-------|
          |    |     C800:0000h -      | 1 & 2 | 1 & 2 | 1 & 2 | 1 & 2 |
          |    |      C800:1FFFh       |       |       |       |       |
          |----+-----------------------+-------+-------+-------+-------|
          |    |     CA00:0000h -      | 1 & 2 | 1 & 2 | 1 & 2 | 2 & 3 |
          |    |      CA00:1FFFh       |       |       |       |       |
          |----+-----------------------+-------+-------+-------+-------|
          | »  |     CE00:0000h -      | 1 & 2 | 1 & 2 | 2 & 3 | 2 & 3 |
          |    |      CE00-1FFFh       |       |       |       |       |
          |----+-----------------------+-------+-------+-------+-------|
          |    |     D000:0000h -      | 1 & 2 | 2 & 3 | 1 & 2 | 1 & 2 |
          |    |      D000:1FFFh       |       |       |       |       |
          |----+-----------------------+-------+-------+-------+-------|
          |    |     D200:0000h -      | 1 & 2 | 2 & 3 | 1 & 2 | 2 & 3 |
          |    |      D200:1FFFh       |       |       |       |       |
          |----+-----------------------+-------+-------+-------+-------|
          |    |     D400:0000h -      | 1 & 2 | 2 & 3 | 2 & 3 | 1 & 2 |
          |    |      D400:1FFFh       |       |       |       |       |
          |----+-----------------------+-------+-------+-------+-------|
          |    |     D600:0000h -      | 1 & 2 | 2 & 3 | 2 & 3 | 2 & 3 |
          |    |      D600:1FFFh       |       |       |       |       |
          |----+-----------------------+-------+-------+-------+-------|
          |    |     D800:0000h -      | 2 & 3 | 1 & 2 | 1 & 2 | 1 & 2 |
          |    |      D800:1FFFh       |       |       |       |       |
          |----+-----------------------+-------+-------+-------+-------|
          |    |     DA00:0000h -      | 2 & 3 | 1 & 2 | 1 & 2 | 2 & 3 |
          |    |      DA00:1FFFh       |       |       |       |       |
          |----+-----------------------+-------+-------+-------+-------|
          |    |     DC00:0000h -      | 2 & 3 | 1 & 2 | 2 & 3 | 1 & 2 |
          |    |      DC00:1FFFh       |       |       |       |       |
          |----+-----------------------+-------+-------+-------+-------|
          |    |     DE00:0000h -      | 2 & 3 | 1 & 2 | 2 & 3 | 2 & 3 |
          |    |      DE00:1FFFh       |       |       |       |       |
          |----+-----------------------+-------+-------+-------+-------|
          |    |     E000:0000h -      | 2 & 3 | 2 & 3 | 1 & 2 | 1 & 2 |
          |    |      E000:1FFFh       |       |       |       |       |
          |----+-----------------------+-------+-------+-------+-------|
          |    |     E200:0000h -      | 2 & 3 | 2 & 3 | 1 & 2 | 2 & 3 |
          |    |      E200:1FFFh       |       |       |       |       |
          |----+-----------------------+-------+-------+-------+-------|
          |    |     E400:0000h -      | 2 & 3 | 2 & 3 | 2 & 3 | 1 & 2 |
          |    |      E400:1FFFh       |       |       |       |       |
          |----+-----------------------+-------+-------+-------+-------|
          |    |   RAM/ROM disabled    | 2 & 3 | 2 & 3 | 2 & 3 | 2 & 3 |
          |------------------------------------------------------------|
          | Note: Designated pins should be in the closed position.    |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |               MISCELLANEOUS TECHNICAL NOTES                |
          |------------------------------------------------------------|
          | Model PC2/50 is the same as PC2B/50 with the exception of  |
          |    jumper shunts, and RAM and ROM chips. PC2/50 can be     |
          |    upgraded to PC2B/50 by ordering an upgrade kit that     |
          |                 includes shunts and chips.                 |
          +------------------------------------------------------------+