Couple of ZX81 Interfaces / Boards
Re: Couple of ZX81 Interfaces / Boards
Optrek-RS stands for Pull-up Resistance(s) The book was originally written by Stephen Adams (1982), but this board comes out of the dutch version Published by Kluwer (mine has ISBN 90201 1640 1 that was the 3rd print 1984)
32K SRAM WRX compatible, 32Bit IO-Port, ROM Ghost, ZX-Printer.