Thank you Bill, but the board in the link is completely different. The board in my reader is almost identical to the one in this auction (version D vs. A): https://www.ebay.co.uk/itm/333131813919 Only TTL-Logic, no processor, no UART, paralleöl data output.
Micha Bill Degnan via cctalk wrote:
I have something close-ish http://www.memex.ca/wp-content/uploads/old/M110545-Dostek-440A-BTR-User-Guide.pdf Bill