ianoid Posted October 27, 2019 Share Posted October 27, 2019 Two things that came with Coco stuff. One may be a Disk Drive adapter? The other is a switch, but I'm not sure what 4 pin DIN(?) this would be useful for? Also came with a Symphony 12, which had no markings on the outside aside from the Speech Systems label but has 4 AY-3-8912 3 voice music synthesizer chips in it (last three. Fun! Quote Link to comment Share on other sites More sharing options...
Bruce Tomlin Posted October 28, 2019 Share Posted October 28, 2019 (edited) 4-pin plug is the printer port, RS-232 with one-way CTS handshaking, defaults to 9600 baud for LPRINT. It's completely bit-banged, so it isn't reliable to receive faster than 1200 baud. The Videotex cartridge actually used the video horizontal sync interrupt as a 25x clock to sample the input every scan line for a reliable 300 baud. At some point I rigged it up so that BASIC could use that code, but it really hurt performance. It could also be used with a DLOAD server from a PC. I found some code I wrote a long time ago ('84 in asm and '96 in Pascal!) Last week I think I ran across the Coco that I used it with back in '96 (as a 2600 cart dumper), so I may tinker with it in C next week. Basically it would let me send a small BASIC program from plain text. And that other thing is indeed a disk adapter. WDC1773 is a floppy controller chip. Quad AY-3-8912s? Holy crap that's a lot of sound chips. Edited October 28, 2019 by Bruce Tomlin 1 Quote Link to comment Share on other sites More sharing options...
linville Posted October 28, 2019 Share Posted October 28, 2019 As above, the 4-pin DIN is the CoCo serial port standard. The one with the WDC1773 is a floppy driver controller, apparently with 4 ROM sockets for alternative DOS ROMs. The Symphony 12 indeed supported quad AY-3-8912 chips. If you might be interested in selling that one (separately or part of a lot), then please let me know. I would be interested. Quote Link to comment Share on other sites More sharing options...
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