*** M E M O R U M ***

Welcome on board Keith!



Mark

I'll have a second portion of Pi with that please



Fits in with one theory of life, if you talk about a problem for long enough, someone will develop the solution for you...

Mark

Another thought... If a two way serial link (I2C or SPI) is provided between the MEMU-Pi and a micro-controller, the MEMU-Pi can send the output scan data to the micro-controller, which can output it to the keyboard. The micro-controller then reads the keyboard "sense" lines and sends this...

@Dave, you are good at opening these cans of worms

Mark

If there are games (or indeed) other software that needs this, there are only two choices: exactly replicate the keyboard interfacing functionally, or use your own hardware arrangements and then simulate the effect to the MTX system so that the game software still thinks it is seeing a MTX keyboard....

Since the joysticks just mimic key presses, would wiring them in parallel with the keyboard matrix, as on the original MTX still work for the Pi ? Yes, there would be no operational problem with that. The only concerns are RFI and cable capacitance. But I don't really see these being a problem :mrg...

Ahh, the black art of keyboard decoding :mrgreen: Actually you don't need anything like 18 lines to decode the MTX keyboard. You do however need one inexpensive logic chip. A 74LS145N (at 88p+VAT) can take 4 inputs and decode them to 10 outputs which can drive 10 keyboard lines. As a different binar...

Sorry, my bad pun was probably a bit too obtuse, as I was typing "pointer", the "C" thought popped into my head. Mmm, I'm off again....... Now I'm think that "pop" IS relevant to Z80! - I'd better stop - there are probably "stacks" more that I could think of,...

Martin A wrote:

Dave wrote:Martin uses ZDS

Actually he uses a home-brew assembler written in BBC basic on an Acorn RiscPC, with all sorts of oddities.

ZDS is there when things need to be shared with the rest of the world

BTW, did you ever share your "home-brew assembler written in BBC basic"?

Mark

Ahh, but I have not really got into C. The only C I have played with is on an Atari ST.

My favourite high level language is OPL, but as it only runs on Psion hardware, its use is a bit limited

Mark