20 May
2016
20 May
'16
2:22 a.m.
On Tue, May 10, 2016 at 11:47 PM, Eric Smith <spacewar at gmail.com> wrote:
the Tektronix DAS 9100 logic analyzer is Z80 based,
and
contains many ROMs, mostly 8KB MK36000 series masked ROMs and MCM68764
EPROMs, but only one ROM appears to contain much actual Z80 code. That
8K ROM is labeled "INTERP" and contains a bytecode interpreter.
Apparently all the other ROMs are full of bytecode. The bytecode does
not match the UCSD p-code nor the ETHZ P4 p-code. I've started
disassembling it, but haven't yet learned too much.
Volume 1 of the service manual confirms that most of the software in
the DAS 9100 is written in Pascal and interpreted. Since the p-code
doesn't match UCSD or ETHZ, I still suspect that it was compiled using
the Pascal/8002 compiler from Pascal Development Co., but I'm not
optimistic about finding a copy of that compiler or even the
documentation for it.
I enjoyed doing a little bit of reverse-engineering of the bytecode
interpreter, but I don't think I'll pursue it any further.