
SCIENTIFIC MICRO SYSTEMS

OMTI 810, OMTI 812, OMTI 820, OMTI 822

Data bus: 16-bit, ISA

Size: Full-length, full-height card

Hard drives supported: Up to seven SCSI devices

Floppy drives supported: OMTI 81x: None

                    OMTI 82x: Two 360KB, 720KB, 1.2MB, 1.44MB

Maximum heads/cyl.: 16 heads and 1024 cylinders

[Image]

                                CONNECTIONS

                     Function                              Location

  50-pin SCSI connector-internal                              J1

  50-pin SCSI connector-external (Models 8x2 only)            J2

  34-pin control cable connector-floppy drive                 J3

  4-pin connector-drive active LED                            J4

                        USER CONFIGURABLE SETTINGS

                Function                     Location         Setting

     SCSI parity check enabled                 W3             closed

      SCSI parity check disabled                W3              open

     Factory configured - do not alter         W4              open

     Factory configured - do not alter        W10              open

     AT-type floppy drives supported          W11              open
      (Models 82x only)

      Non-stand. floppy drives                 W11             closed
      supported (Models 82x only)

      Factory set on board 32K PROM            W15              open
      size

     Factory configured - do not alter        W26              open

     SCSI-2 RSVD lines grounded               W32             closed
      (terminators installed)

      SCSI-2 RSVD lines not grounded           W32              open
      (terminators removed)

     Floppy drive port address is             W33           pins 1 & 2
      3F0-3F7 (Models 82x only)                                closed

      Floppy drive port address is             W33           pins 2 & 3
      370-377 (Models 820x only)                               closed

     Floppy drive enabled                     W35             closed

      Floppy drive disabled                    W35              open

     Power-ground and chassis-ground          W44              open
      separate

      Power-ground and chassis-ground          W44             closed
      connected

                               SCSI ADDRESS

      Address              W0                W1                 W2

           0             closed            closed             closed

           1              open             closed             closed

           2             closed             open              closed

           3              open              open              closed

           4             closed            closed              open

           5              open             closed              open

           6             closed             open               open

          7              open              open               open

                               BIOS ADDRESS

        Select               W15              W16               W17

          C0000h            closed           closed           closed

          C8000h             open            closed           closed

          D0000h            closed            open            closed

         D8000h             open             open            closed

          E0000h            closed           closed            open

           E8000             open            closed            open

          F0000h            closed            open             open

          F8000h             open             open             open

                             I/O PORT ADDRESS

   Address        W5           W6          W7          W8          W9

       100      closed       closed      closed       open       closed

       120       open        closed      closed       open       closed

       140      closed        open       closed       open       closed

       160       open         open       closed       open       closed

       180      closed       closed       open        open       closed

       1A0       open        closed       open        open       closed

       1C0      closed        open        open        open       closed

       1E0       open         open        open        open       closed

       200      closed       closed      closed      closed       open

       220       open        closed      closed      closed       open

       240      closed        open       closed      closed       open

       260       open         open       closed      closed       open

       280      closed       closed       open       closed       open

       2A0       open        closed       open       closed       open

       2C0      closed        open        open       closed       open

       2E0       open         open        open       closed       open

       300      closed       closed      closed       open        open

       320       open        closed      closed       open        open

      340      closed        open       closed       open        open

       360       open         open       closed       open        open

       380      closed       closed       open        open        open

       3A0       open        closed       open        open        open

       3C0      closed        open        open        open        open

       3E0       open         open        open        open        open

                                DMA CHANNEL

   Channel      W20       W21       W22        W23       W24       W25

      DRQ3    closed      open      open      open     closed     closed

     DRQ5     open      closed     open      open     closed      open

      DRQ6     open       open     closed     open      open      closed

      DRQ7     open       open      open     closed     open       open

                             INTERRUPT REQUEST

        IRQ              W27           W28          W29           W30

        Disabled         N/A           N/A          N/A         closed

          IRQ3          closed       closed        closed        open

          IRQ4           open        closed        closed        open

          IRQ5          closed        open         closed        open

          IRQ6           open        closed        closed        open

          IRQ7          closed       closed         open         open

         IRQ12          open        closed         open         open

          IRQ14         closed        open          open         open

          IRQ15          open         open          open         open

                       MISCELLANEOUS TECHNICAL NOTES

  W12-14, W31, W34, W36, W37, W43, W45 are factory configurable or Not
  used and are hard wired on some board revisions. The default for these
  jumpers is "open", with a jumper stored on pin 2.

