So, I've been looking over a flashable LM that was sent to me, trying to figure out how to make it easier to reproduce (it's basically a hand-made deal, lots of wires going from A to B, traces cut, etc.).
It might be possible to make a more simple flashable LM, but I had another idea - a complete daughter board to replace the 6803 with a 6811 and a flash memory chip. This would replace the analog-to-digital converter, the memory chip, the timer chip, and the processor on the LM board with sockets, and a module would be inserted into it's place. Should be reversible, I think.
I need to finish making a schematic of the existing T2 LM logic circuits to even see how feasible this is, but I think it would solve a lot of the headache issues I have with the LM. Namely, that NONE of the code is quite the same as the SMEC.
So, the options would be:
1) Flash module - this would replace the memory chip, and possibly require some reworking of the LM board (cut traces, added wires).
2) Super LM daughter baord - this would replace the logic circuit chips on the LM with sockets, and give the LM a processor upgrade to a 6811 (same processor as the SMEC/SBEC) allowing it to use some of the SMEC code and add some functionality.
I have no idea at this point what either would cost, but figure the flash module might be a hair more than the SMEC/SBEC, and I guess that the Super-LM Board would be twice that. So, maybe $50 and $100.