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MysteryMeat: Retro 6809 system.

Breadboarded and wirewrapped 6809 system that came out of a box of crap. Do you recognize the design?

rwRW
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I did not make this, mostly posting to get ideas about it. Is it a design you recognize from an old magazine or application note? Board has a 6809 CPU, 2 PIAs 16K SRAM 16K EPROM, Numpad, Thermistor, which unfortunately escaped the pic at the bottom left corner, it's a white blip you can see on one pic, a one line LCD, I think a CTC/RTC have to look at that again, an ADC to read the thermistor and various bits of TTL glue logic. It does not seem to have provision for any other input or output. Best guess is it's a simple thermometer and clock project, training wheels, the sharpied numerals on the numpad show no sign of wear at all, so looks barely used. I'm a shade doubtful that the wire wrapping was completed, doesn't seem quite enough... but that could be because it's so simple. Who knows if the ROM survived sitting years without it's erase window covered, if there got to be anything in it in the first place. Mostly posting it for interest's sake and

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dar.ryl wrote 07/08/2017 at 20:44 point

Should be pretty straightforward to reverse out.  Get yourself some graph paper, a meter with a continuity beeper, and have at it.  Or not.  

"Mostly posting it for interest's sake and..." ... and what?  :-)

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Yann Guidon / YGDES wrote 10/24/2016 at 22:06 point

Time to extract the schematics...

  Are you sure? yes | no

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