So I got out my old beebug kit and predictably, there were issues that weren't there when I last used it!

So many things these days are mass produced, not designed to last, and make as cheap as possible for as much money as possible. We started RetroSix not as a mass market business, instead with the aim of perfection. Recreating moulds of original shells, casting them from quality ABS, redesigning hardware such as power supplies, USB-C, audio and more, to upgrade your consoles to the highest quality available. No cheap junk sold for profit.

Host software / firmware

The programmer devices required for programming the electrically programmable read only memories (EPROMs) are generally expensive. Here is a low-cost EPROM programmer circuit to program binary data into 2716 and 2732 EPROMs. EPROM Programmer Circuit

And we can finish off by moving the /WE connection from Arduino pin D13 to pin A2 and adding connections from A1 to /OE and from A0 to /CE. MC68HC08AS20, MC68HC08AS32, MC68HC08AS60, MC68HC08AZ32, MC68HC(9)08AZ32A, MC68HC908AZ60, MC68HC908AZ60Aor 27C512 are double the capacity of a 27256 / 27C256. These require two extra wires. Then the machine will see them as four 16K byte ‘ROM chips’. As I suspected the "Size" indication is related to the rom image rather than the IC, so it can't detect the size of a blank one.