Emplant Reference

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  The Emplant is a Zorro-II board that, in combination with the appropriate
  software, makes it possible to emulate other computers on the Amiga system.

  The Emplant hardware performs several functions. Sockets are provided for
  both DIP- and SIMM-packaged ROMs (the ROMs of the "target" computer are
  installed on the board, then copied to image files, then removed). Also
  provided are two Macintosh-type serial ports and a basic, no-frills, non-
  autobooting SCSI-1 interface based on the 53C80 SCSI chip. (There are also
  empty sockets for audio digitizing chips on the Emplant board, but the
  software has never been implemented.)

  Dual serial ports and the SCSI controller are optional, and some models of
  the board come without one or both of these options.

  A "RsrvMem" command added to the the beginning of the startup-sequence sets
  up the MMU for use with the Emplant board. If you wish to remove the
  Emplant from the A4000, it's best to remove this command first, or getting
  the machine to start may be impossible.

  Early versions of the board came with "ST" brand serial chips, "LOGIC"
  brand SCSI chips, or custom GALs with date codes earlier than 4693. All of
  these chips caused problems; the serial and SCSI chips with their
  respective ports, the GAL chips with general operation. Utilities Unlimited
  has offered free replacements for these problem chips in the past. Contact
  them at:

      Utilities Unlimited International, Inc.
      790 N. Lake Havasu Avenue #16
      Lake Havasu City  AZ  86403
      (602) 680-9004 Sales
      (602) 453-6407 Fax
      (602) 680-9234 Tech Support

  A commonly-defective -5V regulator on the A4000 motherboard can cause the
  Emplant board to fail diagnostic tests and not perform properly in other
  ways, including unreliable operation of AppleTalk devices. See the Common
  Problems section on -5V Power Problems for more information.

  The included diagnostic program is often a source of concern; reports
  indicate that it doesn't work properly on PAL machines, and often it can't
  locate the Emplant board, even if there are no problems. This may be a
  problem specific to the A4000.

  Board Layout
  _________________________________________________________________
 | JP1                                 __   _ JP6 _   RCA____      |___
 | xxxxxxxxxxxxxxxxxxxxxxxxxxx  JP2   |  | |  | |  |    |    |     |
 | ROM SIMM Socket    ------------    |  | |  | |  |    |    |   ##| Serial
 |                    | Autoboot |    |  | |  | |  |    |    |   ##| Port B
 |                    |  Socket  |    |  | |  | |  |    |    |     |
 | ------------   ----------------    |  | |  | |  |    |    |   ##| Serial
 | | ROM/RAM  |   | ROM/RAM  | JP3    |__| |__| |__|    |____|   ##| Port A
 | | Socket-1 |   | Socket-3 |    JP4         _________________    |
 | ------------   ------------               | 53C80 SCSI Chip |   |# External
 | | ROM/RAM  |   | ROM/RAM  | JP5           |_________________|   |# SCSI
 | | Socket-2 |   | Socket-4 |                                     |# Port
 | ------------   ------------           Internal SCSI Connector   |#
 |_______________________________________XXXXXXXXXXXXXXXXXXXX_JMP1_|
     |||||||||||||||||||||||||||                                   |

  Jumpers

    JP1: ROM SIMM Address Line Selection
         Right: Default.
          Left: ???.

    JP2: ROM SIMM Write Enable
         Right: Default (gated write select).
          Left: Signal pulled up to +5V.

    JP3: Auto-Boot ROM/SRAM Socket Power/Address Select
         Upper: Supply power to 28-pin DIP.
         Lower: Supply address line for 32-pin DIP.

    JP4: ROM/RAM Socket 3/4 ROM/SRAM Socket Power/Address Select
         Upper: Supply power to 28-pin DIP.
         Lower: Supply address line for 32-pin DIP.

    JP5: ROM/RAM Socket 1/2 ROM/SRAM Socket Power/Address Select
         Upper: Supply power to 28-pin DIP.
         Lower: Supply address line for 32-pin DIP.

    JP6: Mac Emulation Audio Mode Select
         Upper: Mono.
         Lower: Stereo.

    JMP1: SCSI Terminator Power Enable
           On: Supply SCSI terminator power.
          Off: Do not supply SCSI terminator power.

    RCA: Input Connector For Audio Digitizing Circuitry