SCIENTIFIC MICRO SYSTEMS

OMTI 8120, OMTI 8127

Data bus: 16-bit, ISA

Size: Half-length, full-height card

Hard drives supported: OMTI 8120:Two MFM ST506/ST412 drives

OMTI 8127:Two RLL ST506/ST412 drives

Floppy drives supported: None

Maximum heads/cyl.: 16 heads and 2048 cylinders

[Image]

                           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

  5-pin connector-DC power                           J4

                        USER CONFIGURABLE SETTINGS

               Function                     Location          Setting

  »    Factory configured - do not             W1             closed
       alter

       If BIOS is #1002661, then drive         W1              open
       0 parameters are set to 4 hds.
       and 612 cyl. If BIOS is
       #1002662, then drive 0
       parameter are set to 4 hds. and
       615 cyl.

       If BIOS is #1002661, then drive         W2              open
       1 parameters are set to 4 hds.
       and 612 cyl. If BIOS is
       #1002662, then drive 1
       parameter are set to 4 hds. and
       615 cyl.

  »    Factory configured - do not             W2             closed
       alter

  »    I/O speed set to high                   W3              open
       performance string mode

       I/O speed set to loop                   W3             closed

  »    Factory configured - do not             W4               N/A
       alter

  »    BIOS base address is C8000h             W9              open

       BIOS base address is CA000h             W9             closed

                             I/O PORT ADDRESS

       Address           Jumper W5         Jumper W6         Jumper W7

  »       320h             open              open              open

          324h            closed             open              open

          328h             open             closed             open

          32Ch            closed            closed             open

          1A0h             open              open             closed

          1A4h            closed             open             closed

          1A8h             open             closed            closed

          1ACh            closed            closed            closed

                            DRIVE CONFIGURATION

   DRIVE 1       DRIVE 0      BIOS #1002579

  Jumper W1     Jumper W2      Jumper W3       Jumper     Cyl.     Hds.
                                                W4

    closed       closed          closed       closed       -         -

     open        closed           open        closed      987        7

    closed        open           closed        open       918       15

     open         open            open         open       612        4

                            DRIVE CONFIGURATION

   DRIVE 1       DRIVE 0      BIOS #1002579

  Jumper W1     Jumper W2      Jumper W3       Jumper     Cyl.     Hds.
                                                W4

    closed       closed          closed       closed       -         -

     open        closed           open        closed      820        6

    closed        open           closed        open       1024       9

     open         open            open         open       615        4