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Re: Super Serial Card help

Here is a test procedure for the Super Serial Card ACIA.

]CALL -151
*C0A9:00       ; reset 6551
*C0AB:1E       ; CtrlReg: 1 stop, 8 data, RxC=BRG, 9600bps
*C0AA:0B       ; CommReg: no parity, no echo, no irqs, DTR
*C0A8:41       ; send A
*C0A8:42       ; send B

If that works then it looks like only the ROM or decoding is bad.
Try re-seating the ROM (location 4C), 74LS00 (2C), 74LS32 (3C), 74LS11
(1C) and the 74LS259 (1B).