Sinclair ZX80 / ZX81 / Z88 Forums

I always learn from my mistakes. So I'm going to make a whole lot more tomorrow too.

Oh, in other news I just LOADed 3D Monster Maze from an original tape through the dubber.

GAL = Gate Array Logic - a now obsolete class of programmable logic device which allows the user to re-configure the internal configuration of 'macrocells' to perform arbitrary logic functions rather like how an EEPROM reconfigures bits to represent bytes. It's the predecessor to CPLD and FPGA, and ...

Welcome aboard!

Thanks Mark. I'll check the switching speed. What kind of lower limit value should I consider?

At this point it's academic, I'd like to know why this doesn't work but I'm not willing to hurt my brain over it. It's an item in a long list of things I have to finish, and so in order to not delay the items rapidly approaching from behind I'm going with another solution. I only hope it doesn't suf...

Superblinkenlights! Nice work

So. I'm pulling my hair out trying to understand the behaviour of what I consider to be a quite trivial interfacing matter. I have a GAL (20V8B) that is programmed to recognise to an IO read at a particular address. When the IO read is detected it enables a normally hi-z output and gates the logic l...

Lordy yes I'd forgotten about that! 4:30am ferries. Quite grim