[rescue] next rescue.. Sun-1.5

Earl Baugh earl at baugh.org
Mon Apr 4 13:58:26 CDT 2016

Try again... stupid Google Mail interface...


It is a Kontron PSI 9068 system from 1984. This is an mbus system. In it,
there are:
- Sun 501-0600 CPU board
- Sun 501-0147 memory board
- a board with Z80 stuff and RS232/RS422 (appears to be a single board Z80
system for I/O)
- a board that hooks up to an empty  modem  slot
- an MFM controller and ST-255 drive
- 5.25  floppy drive

Very cool that you go one.  Interesting set of parts!  I have a document
that describes a Sun 1.5 board
though I'm not sure if it's your board.  I can send the document, let me
know (I know the list will
filter it out).  The doc I have does indicate a 68010 for the 1.5.   The
doc doesn't list any part number
that I could find.

 I'm also curious where you found this FEH on-line.
I have a very old one in paper form at home and the earliest Electronic one
I have is 1989,
and I didn't see that board listed in it.

Taking a look at the CPU board, I noticed the 501-0600 indication. I found
old field handbook on the web, which mentions these Sun-1 boards:
501-0001 256KB Sun-1 68000 CPU
501-0002 256KB Sun-1 68000 CPU TI
501-0004 256KB Sun-1 68000 CPU Kontron
501-0600 256KB Sun-1.5 68010 CPU (obsolete, unsupported)

This is quite interesting. Apparently, there are specific Sun-1 CPU boards
TI and Kontron. And my board is a  Sun-1.5 ? The handbook says it has an
but there is an 68000 in it.

Some of these boards may be the VLSI manufactured ones, so I suspect they
are SUN not Sun.
Yours from the picture you sent  is marked for Sun.   Keep in mind that I
believe it's a newer board
than a Sun 1 because of the orientation of the logo.  It was "square" to
start with... the early boards don't have a logo at all.
By the Sun 2 they were silk screening it on them.  Also note the number
starts with a 501.  Sun initially used 270 designations on
the Sun 1 boards... then you got the 500 markings... they would have
dual designations
as well (some for part, and some for assembly
from what I can tell).   Does the board you have have any  wire wrap
"fixes" on the back?  The Sun 1 boards all seem to have some either
on the front or back.

The other thing, the VLSI boards I have pic of indicate VLSI (they are
marked with it in the location where mine
is marked with the 270.   The SGI variant also has a 68000.  It's a larger
board as well...  The Sun 2 boards with the
68010 have a definitely different layout.    I wonder if the jumpers are
being use to toggle it to use the 68010.

Is this some development board for an upgraded 68010 Sun-1 that was
developed by Kontron,
but never marketed as Sun came with the Sun-2? This particular system was
marketed as an 68000 system by Kontron,
Kontron, which is based in Munich, Germany, still exists and is still
active in the market of embedded systems).

The board looks quite similar to the 501-0001 board. There are a few more
jumpers and one TTL IC has been replaced by a small board containing an
AM2996PC IC.

Interesting, I hadn't seen that when I looked at the picture initially.
What's the chip next to it? I can't make out the markings in the picture.
Like to find the data sheet on it and the AM2996PC to see if I can figure
out what they're for.

RE Testing.

Your approach makes sense.   Did you try just the Sun CPU and Memory board?
Do you have a video card to test with?


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