It's a 8080-compatible CPU. It needs the RP2040 to simulate RAM and I/O.
TBD
RP2040.
| # | Input | Output | Bidirectional |
|---|---|---|---|
| 0 | bus_handshake_ack | bus_handshake_req | data_bus[0] |
| 1 | debug_req | bus_state[0] | data_bus[1] |
| 2 | int_req | bus_state[1] | data_bus[2] |
| 3 | bus_io | data_bus[3] | |
| 4 | cpu_fetch | data_bus[4] | |
| 5 | cpu_in_debug | data_bus[5] | |
| 6 | cpu_halted | data_bus[6] | |
| 7 | cpu_int_ack | data_bus[7] |