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

[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

                        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.