Electronics > Projects, Designs, and Technical Stuff

Found a weird old computer dumpster diving. (z80?)

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MLXXXp:

--- Quote from: T3sl4co1l on March 28, 2020, 07:01:02 pm ---doesn't seem to have much RAM

--- End quote ---

For what the machine does, 2K is probably plenty.

tsvisimcha:
What kind of chips am I going to need to get if I want to build a CP/M machine?

greenpossum:

--- Quote from: rstofer on March 28, 2020, 06:19:24 pm ---Disassembly from a ROM dump is a fool's exercise.

--- End quote ---

However getting the code isn't the only purpose of disassembly. By looking for IN and OUT instructions one might be able to see where the peripherals are in the I/O space. Otherwise trace the address lines through the decoders to the chips.

I wouldn't bother trying to make a CP/M machine out of it. It would be easier to start from scratch.

T3sl4co1l:

--- Quote from: MLXXXp on March 28, 2020, 07:22:30 pm ---
--- Quote from: T3sl4co1l on March 28, 2020, 07:01:02 pm ---doesn't seem to have much RAM

--- End quote ---

For what the machine does, 2K is probably plenty.

--- End quote ---

I mean, obviously.  Whatever it did, it was able to do...

I have no idea what the machine does.  Did someone link the manual above and I scanned past it? ???

The ADC/DAC does suggest some analog data processing, but it could well be low bandwidth process parameters, or even housekeeping like voltages and temperatures.  My guess would be it's one or two serial interfaces, perhaps stateful with something like an ANSI command line (terminal) interface, perhaps with some relationship between the two channels (maybe one is master to a PC, the other collects data from more devices; maybe they're equivalent and it's like a multi-user terminal interface; lots of possibilities).  The 16550s (versus 8250s or Z80-SIOs) imply modest bandwidth, but obviously nothing a Z80 can't handle.  And the small RAM implies not much buffering, enough to run terminal interface(s) say, and some kind of basic state machine for the actual core functionality.

Tim

MLXXXp:

--- Quote from: T3sl4co1l on March 28, 2020, 09:23:51 pm ---I have no idea what the machine does.

--- End quote ---

I think it's basically a glorified "Dremel" for arthroscopic surgery.

http://www.medicalproductguide.com/term/3771/arthroscopic-shaver-systems

https://www.somatechnology.com/Medical-Products/Endoscopy/Arthroscopic-Shavers/dyonics-ps-3500-ep-endoscopy-arthroscopic-shavers.aspx

https://en.wikipedia.org/wiki/Arthroscopy

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