Hi, I need help to get an old logic analyzer up and running.
About nine month ago I found a Logic Analyzer 1650A computer in the trash. I took it home, plugged the power in and then pushed the power button. It began to boot, but there was no operating system.
This is the power-up self tests on screen:
- passed ROM test
- passed RAM test
- passed Interrupt test
- passed Display test
- passed Keyboard test
- passed Acquisition test
- passed Threshold test
- NO DISC Disc test
Everything seems to be in order but the missing floppy disc. So, I looked inside the accessories bag attached to the analyzer's chassi, and found the operating system disk in there, how lucky was that?
I tried to boot once again, but the Disc test instead resulted in "SYSTEM DISC NOT FOUND".
This is all the information printed on the disc:
Micro flexible disc
*** DOUBLE SIDED FORMAT ***
Operating System for the 1650A/1651A Logic Analyzers
01650-13503 Ver.1.0.2 2750
Software Product of the USA
I've got a new floppy disc to use if the old one (from 1987) is useless:
Diskformat: High-density 1.44 MB
I found the service manual here:
It says the analyzer comes with Two Operating System Discs and this text is about the memory in the service manual:
"Since the RAM is a volatile memory, the operating system is loaded at each power-up of the instrument via the built-in disc drive and a mini-floppy disc"
This is the reference manual:
This is the Operating System, v.1.11 (download):
Conclusions and thoughts
The operating system seems to be run from a Micro flexible double sided disc. The service manual said stuff about a mini-floppy disc, but also micro. Is this just a typo or does it need a mini disc for booting and then switching to the OS disc? The manual clearly says there are two discs, but I've got only one.
The floppy drive seems to work because I can hear it reading and it switched between NO DISC and SYSTEM DISC NOT FOUND.
I've tried the downloaded operating system, but I don't know if there is a special file system to be used. Maybe my high-density 1.44 MB disc is incompatible? It still gives me the SYSTEM DISC NOT FOUND message.
Please help me with any information, tips or anything useful. I've never come across any other equipment than Windows/DOS PC in the context of floppy discs before. Please feel free to comment on anything about this post. Thanks!