The 65C02 card includes support for a CMOS 65C02. The HBC-56 is currently using a WDC65C02.
The card also includes a 65C22 VIA used for SPI and timer interrupts. PORTA of the VIA is free for general use.
It includes optional circuitry for a clock which eliminates the need for the clock card.
Revision 1.0 of this board does has minor issues which will be recfified in v1.1:
- Reversed /R and /W
- Missing pull-up resistor on /NMI
- Dropped support for NMOS 6502
- Initial hand-wired version
Video covering the high-level design, ordering, assembly, diagnosis and repair of the v1.0 card:
Thanks to PCBWay for supporting this build.
