I've added a MC68B50 UART to my HBC-56 and have started developing a memory monitor to run on it. Since the memory monitor can write to memory using hex strings, I've modified ACME Assembler to output in Intel HEX format and transform the output to memory monitor commands.
The result? Can now load programs (games) over serial.
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I've also added UART support to my emulator and can connect to both the emulator and the real machine using PuTTY.
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