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      Power-on Tests

   Identifier   Device Description

    F  MONO     Base video  [1-bit monochrome]
    E  CLK      System clock  [Time-of-Year clock]
    D  NVR      Nonvolatile RAM
    C  DZ       Serial line controller  [Includes keyboard and mouse.]
    B  MEM      Memory
    A  MM       Memory-management unit
    9  FP       Floating point unit
    8  IT       Interval timer

    7  STRG1    ST506 disk controller \ ST506/SCSI adapter
    6  SCSI-A   SCSI-A bus controller /

    7  SCSI-A   SCSI-A bus controller \ SCSI/SCSI adapter
    6  SCSI-B   SCSI-B bus controller /

    5  SYS      Interrupt controller and Ethernet ID ROM
    4  8PLN     Optional 8-plane graphics coprocessor
    3           Reserved
    2           Reserved
    1  NI       Ethernet network interconnect

      Power-on Test Indicator Display


      After a (hexadecimal) digit:

   _  The device is not in the system.
   *  The device ROM is corrupt.
   ?  The device failed the test.
   .  The device passed the test.

      Some popular Power-on Test problem results:

   ?  E  0040  0000.0005   The system clock has not been set.
   ?  D  0050  0000.0005   The system battery is low or dead.
   ?  7  00A0  0000.4001   No SCSI devices are on the A (of A+B) bus.
   ?  6  00A0  0000.4001   No SCSI devices are on the B (or A) bus.
   ?? 1  00C0  0011.700E   Ethernet AUI port, not connected.
   ?? 1  00C0  0000.7004   Ethernet BNC port, not connected.


      TEST 50 Report

   In the "TEST 50" report:

   ?  means a minor problem.
   ?? means a major problem.
   *  means the option device is installed, but its ROM code is not
      executed.  (Possible only for 7,6,4,3, or 2.)

   Popular "TEST 50" results:

   ?? NI       0000.7004   Ethernet BNC port, not connected.
      NI       0000.0001   Ethernet BNC port, connected properly.
   ?? NI       0011.700E   Ethernet AUI port, not connected.
      NI       0100.0001   Ethernet AUI port, connected properly.

   In the SCSI bus sections, the device codes include:

   FFFFFF03   Host adapter
   FFFFFF05   No device
   00000001   Fixed disk
   05020001   RRD40  (CD-ROM)
   05000001   other CD-ROM
   01000001   TK50Z  (TK50 tape)
   000000D4   fixed disk with too-long ID string

   In the ST506 (STRG-1) controller section, the items (DUA0, DUA1,
DUA2, DUA3) show the number of disk blocks (hexadecimal):

   00000000   No device.
   FFFFFFFF   RX23 floppy, no diskette.
   00000B40   RX23 floppy, 1.44MB diskette (0xB40 = 2880).
   000146B8   RD32 (0x146B8 = 83640, "42MB").
   00022000   RD53 (0x22000 = 139264, "71MB").
   0004C437   RD54 (0x4C437 = 312375, "159MB").

   DUA0 and DUA1 are RD-series (ST506, MFM) disks which apparently were
never offered in these systems.  Only early versions on the adapter
board include all the parts required to use them, and even many of those
lack the corresponding 34- and 20-pin connectors.  DUA3 may be reserved
for the second half of an RX50 dual floppy drive.  (No information is
available on whether an RX50 would work.  The firmware V1.5 does not
work with an RX33.)  The (earlier) full-function ST506/SCSI board
includes three eight-pin DIP IC's and a few passive parts which are
missing on the (later) floppy-only version.

   In the serial line controller section, the six items are:

   Keyboard port, Video port, Communication port, Printer port,
Keyboard self-test, and Mouse self-test.  Result codes:

   00000001   Good.
   00000000   Missing.
   000012A0   Mouse self-test passed.


   To enable the extended diagnostic functions, plug a loopback
connector (DEC part 12-25083-01) into the Comm port (arrows):

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      |  |  +--+  |  |
      |  |  |  |  |  |
      1  2  3  4  5  6

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© 2023 Steven M. Schweda.