Sinclair ZX80 / ZX81 / Z88 Forums

Yes, Thank you Mark, that is how i understood it as well. One question came up, is the !REFSN on the back of the ZX81, the same as the !RFSH on the Z80 (i would make sense, except for the confusion it might cause) Then the other thing i was wondering about, downloading some .P from some site, what s...

Yeah Hold-on, but have i got it wired-up right, looking at the topic again i think i have ? Before i start changing stuff.

Ah Sh....T now i see what i've done wrong, i should have wired up the !WR Pin not the !RD .... oh man, sometimes i wonder about me. okay back to the drawing board, pull the pack out of the box again.

Well The Ram-Pack i build consists of a 32K SRam, with Memory avaiable between 4000H & 7FFFH (standard 16K) and between B000H & FFFAH (the other half minus the final 4 addresses that are being used for a 32-bit interface) and because i had been using some logic gates to get the proper signal i used ...

I am, by now quite confused about all the HiRes, Maybe it is just to much info, although i suspect that part of the reason is that i wasn't into this at the time it was developed, and therefore don't see it step by step. Anyway as far as i can tell, there is 2 schemes (more or less) that work withou...

Ok Here's the new topic, I've altered my Ram-pack so that it should be able to deal with Hi-Res, but how to test this ? and where can i find a complete explanation of the different systems used ?

Ok, so found some time to free up one AND-gate, and used it to connect !REFSN && !RD and everything does work, but now i would like to test and see if the HiRes is working. Maybe it's time to start a whole new Topic hmm what sub-index ?

I don't know the game, and how it is actually set up, but i suspect that the AI creates a virtual map in memory into which it plays possible scenarios, and that for this it has a dedicated memory allocation max size 60x100 and that the positioning is done by increasing jump in memory location by 100...

i saved up to buy the book i think i paid fl59,- , but it being in English which is not my native language didn't make comprehension easier. And as i said it somehow disappeared (only 1 of 2 books i used to have that did..) but it does deserve another front to back read for me. There are nearly alwa...

No these will do, i usually use my scanner :D I was making a binary to BCD converter, but got confused by the meaning of of the 'c' in rlc thought it meant carry, but as it turns out means circular, anyway thx, i got it to go already using the debugging functions of the assembler, found where the er...