Marcel @marcelk has kindly shared a v4 ROM with me that contains the virtual 6502 code plus the 6502 WozMon and 6502 disassembler - as used on Apple 1.
I now need to take a crash-course in 6502 assembly language programming so that I can make full use of this whole new dimension to the Gigatron TTL Computer.
Also, this week, fellow Gigatron enthusiast xopr, has connected an Arduino to the Gigatron expansion pcb, using it as an SPI slave, which can be used as a general purpose GPIO peripheral processor. More details in this thread:
If you are in the UK, I will be attending OSHcamp in Hebden Bridge on August 31st/ Sept 1st with a Gigatron presentation, and then with @marcelk at the Cambridge Centre for Computing History for their RetroComputer Festival on the 7th & 8th September.