Firstly any i8048/8049 is a ROM product and so cannot be user programmed. They can be externally enabled, bypassing the internal memory (see 8035/9 later).

Do you have the means to program the 8748/9? If not perhaps you should be looking at the i8035/9 which were ROMless versions and were intended to use external EPROM- something like a 2716 or 2732. As I recall it needed an octal latch also to store the lower 8 bits of the address. You do sacrifice the 8 pins of the data port as I/O and also require an i8243 I/O expander to recover the 4 port pins associated with the upper address bits (and gain another 12 I/O pins if memory serves).

I probably have a few 8749s, 8039s and 8243s at home. I will check.

What about the format of the code- will you need an assembler or is it in machine code already?



-Aubrey