Sinclair ZX80 / ZX81 / Z88 Forums

Doh ! Thanks Peter i knew it would be something Blindingly obvious.

Andy

Whooey Looks Like you just gave me something new to tinker with :P i was just reading throught some of those links and came across the word JEDEC and thought ' i've seen that somewhere' quick rummage about in my box of goodies and in my hand is the manual to my eprom programmer which by lucky coinci...

What kind of equipment do you need to program these things?
are they easy to program? Do they have there own language?

As you can probably tell i never used these before, are there any good webpages about the basics ect.

Regards Andy

i'm Still scratching my head wondering why the full 32K is 16K-32K and 48k-64K instead of 16K-48K surely that would make more sense ? As for making this external, i don't see anything particually hard, you would have course have to add a little more decoding for the /RAMCS and also to disable the in...

This Is For Sirmorris Then, regarding The Debugger perhaps something like this :- http://i243.photobucket.com/albums/ff60/andy_rea/ar81b.jpg past instructions at the top current instruction highlighted, upcoming instruction below, top register display current, bottom after current instruction. Pleas...

Whoops! (Keymapping)
<Goes to hide in corner in shame >
sorry was on an older version
</come out of corner>

Andy

Forgot to mention in my previous post a feature i would like, The effects of the next instruction on the registers with altered registers highlighted (perhaps switch off-able, i get confused as to which set i'm supposed to be looking at) And 1 more which i thought about in the meantime and would onl...

Firstly A big thanks to Mike for EightyOne, it's a great emulator tha i almost always use for ZX81 tasks, I'm working with - or should that be pestering ;) - Mike with the aim of improving EO's debugging facilities. I'm hoping to implement some or all of the following: memory display with changed by...

more chips equals more functionallity, it's a more elegant decoding scheme for sure. Nice one Sir Morris.

Regards Andy

as i posted earlier today i designed and built a simple IO for ZX81 using just 3 IC's A 74ls32 , A 74ls273, and a 74ls245. http://homepage.ntlworld.com/deborah.clayton1/pics/zxio-b.jpg that image shows the output(top ic 74ls273), connected to the inputs (bottom ic 74ls245) making it a psuedo 8 bit b...