The instruction of a 8080 that seems hardest to emulate correctly is the DAA (Decimal Adjust) instruction that converts a value in the A register to a two-digit BCD value.

This program does an exhaustive test of all 1024 combinations of the input value plus Carry (CY) and HalfCarry/AuxiliaryCarry (AC) and prints the input and resulting values.

Results currently are pending.

asmx -C 8080 -b -e -l daa.lst -o daa.bin -- daa.asm
dd if=daa.bin of=daa.com bs=1 skip=256 status=none

The software uses the CP/M BDOS Conout (B=2 CALL 5) to send characters to the console.

If the OS in the machine is not CP/M the easist way of modifying this would probably be to patch in some code for the console output at location 0005h.

My 8080 emulator simply accepts any OUT intruction as something that should be sent to the terminal. So I can simple patch in D3 00 C9 there. This corresponds to OUT 0 and a RET.

printf '\xD3\x00\xC9' | dd of=daa.bin bs=1 seek=5 count=3 conv=notrunc status=none

The assembler used is "asmx multi-assembler version 2.0.0" by Bruce Tomlin.