Which, because i'm an idiot, you already figured out. I'm actually not a COCO person, so i should just bow out of offering opinons. Sorry :) On Sat, Jul 16, 2022 at 2:08 PM Dave Shevett <shevett@pobox.com> wrote:
COCO interface, floppy disk controller. The main chip there is: Part, FD1793-02. Description, FLOPPY DISK FORMATTER/CONTROLlER.
The other chips are also floppy controller related. Found a reference to the WD1691V : "So I was surprised when I found an IC chip in the middle of an otherwise functional circuit that was not behaving according to its datasheet. (In this case a WD1691V support chip in a TRS-80 Model III floppy interface.) Apparently this is not so unheard of."
https://retrocomputing.stackexchange.com/questions/13954/what-are-typical-ca...
Looks like ya got yerself an external floppy controller, my friend :)
On Sat, Jul 16, 2022 at 1:41 PM Bob Shuster via vcf-midatlantic < vcf-midatlantic@lists.vcfed.org> wrote:
I found a device among my TRS-80 stuff that I can’t identify. It’s some sort of floppy controller, but in a blank case. It’s got an FD1793B-02 chip socketed in it, and 40-pin and 34-pin card-edge connectors on each end. Solder side of the board has “8709203 Rev. B” on it, but I can find no reference to this online anywhere.
Anyone have a clue? Photos here: https://drive.google.com/drive/folders/1M2AKhMpHAAJ7If6sKEbWejRZ9J_YFsNs?usp... < https://drive.google.com/drive/folders/1M2AKhMpHAAJ7If6sKEbWejRZ9J_YFsNs?usp...
Thanks. - Bob Shuster
-- Dave Shevett shevett@pobox.com
-- Dave Shevett shevett@pobox.com