I just received a machine that someone found at a Vancouver second hand store that I basically told them to buy on the single fact I don't own any COSMAC machines and I've now had a chance to take it apart and photograph the boards. It seems to be some sort of a kit system that the previous owner put into a custom enclosure along with a power supply, a cassette interface and the keyboard off of some other machine or terminal I can't identify but the interfacing absolutely screams it was something they had available from scrap. It's 1802 based, has a single 2716 EPROM and a pair of Intersil D2114 1024 x 4 SRAM chips. The keyboard interfaces through a CDP1851 PIO. The other board on the almost empty backplane was a video board and this is what made me think it's not just a fancy ELF clone. You have six more 2114's and an MC6847 video display generator. The output of that seems to go to an RF modulator-on-a-chip and then out to an F-type coax. The cassette interface is soldered directly to the backplane but its edge connector pinout is awfully similar to the Commodre C2N interface. The boards are all nicely made photo etch with drilled and plated vias which leads me to believe this was a purchased kit system and the chips all date to between 1979 and 1982 but the one thing I am missing is a brand or trademark so I don't even know what I'm looking at. The only thing I got to go on is the name "Color Machine" which I have not yet found anything about. I have not yet had a chance to dump the EPROM and I'm still testing to make sure nothing will blow up in a smoke test, plus I need to dig out a monitor with RF. I have posted board photos over in https://forum.vcfed.org/index.php?threads/unknown-1802-based-system.1237931/ post-1256906 in the hopes someone recognizes it but does this look familiar to anyone here?
-John
