SCIENTIFIC MICROSYSTEMS, INC.

OMTI 3520A, OMTI 3527A

Maximum On-board Memory 8KB
Data Bus                External
Card Size               3.5 in. form factor
Hard Drives supported   Two ST-506/412(MFM) drives on OMTI 3520A

                        Two ST-506/412(2,7 RLL) drives on OMTI 3527A
Floppy drives supported None

[Image]

                                CONNECTIONS

        Function           Location          Function           Location

  50-pin SCSI connector       J1      20-pin data cable            J3
  - external                          connector - drive 1

  34-pin cable connector      J2      20-pin data cable            J4
  - hard drive                        connector - drive 2

  Note: J1 is the interface between the host computer and the OMTI
  3520A/3527A. See Miscellaneous

  Technical Note.

                        USER CONFIGURABLE SETTINGS

                 Function                    Label         Position

  »   SCSI parity check enabled               W4            Closed

      SCSI parity check disabled              W4             Open

  »   Factory configured - do not alter       W5         Unidentified

  »   Factory configured - do not alter       W6         Unidentified

  »   Factory configured - do not alter       W7         Unidentified

  »   Factory configured - do not alter       W8         Unidentified

  »   Factory configured - do not alter       W9         Unidentified

  »   Factory configured - do not alter       W10        Unidentified

  »   Factory configured - do not alter       W11        Unidentified

  »   Factory configured - do not alter       W12        Unidentified

  »   Factory configured - do not alter       W13        Unidentified

  »   Termination power from board            W14      Pins 1 & 2 closed

      Termination power from SCSI bus         W14      Pins 2 & 3 closed

  »   Factory configured - do not alter       W15        Unidentified

                             SCSI ID SELECTION

        Setting               W1               W2                W3

  »          0               Open             Open              Open

             1              Closed            Open              Open

             2               Open            Closed             Open

             3              Closed           Closed             Open

             4               Open             Open             Closed

             5              Closed            Open             Closed

             6               Open            Closed            Closed

             7              Closed           Closed            Closed

                       MISCELLANEOUS TECHNICAL NOTE

  Note: The OMTI 3520A and OMTI 3527A controllers are connected to the
  host system via the SCSI bus

  (connector J1). Up to seven SCSI devices may be connected to this bus
  and an OMTI

  3520A/3527A controller is considered to be one of these devices.
  Multliple controllers may be

  attached, with each controller assigned a unique SCSI ID using jumpers
  W1, W2 and W3.