Sinclair ZX80 / ZX81 / Z88 Forums

It's very good news, thanks a lot

Hello !
I think you can get the rom yourself via the debug procedure I described. It is much easier than it looks.
Use the ROM version you prefer, patch it and test it on EightyOne first.
It is the only possible shot I'm able to suggest (at the moment), and I think it is worth to try.

Does anyone remember the 1st program on the B side of the Horizons tape ? I recently proposed a ZX81 remake: http://www.sinclairzxworld.com/viewtopic.php?f=4&t=552&start=40#p15372 I thought to show also the version for the original host together with a couple of other targets (Spectravideo SVI and M...

One more thought about your sentence: "The clock I set on my 81 gained ten minutes in the first two hours .." Taking in consideration the 50hz/60hz jiffie duration differences: 2 hours = 7200 seconds. If we multiply it by 5 and divide by 6 we get 6000 seconds.. it turns out to be exactly 10 minutes ...

I miss the manual.. is it online ? This is a great piece of history and.. well probably the ZX81 version is the most amazing version. By the way I think I have interesting new now ! As before, use DEBUG and edit a copy of the ROM (for you probably it will be the Husband's version). at the 'minus pro...

Good. First of all, you are now my hero .. 8-) no kidding, wow, an eprom programmer and a Speccy makes me remember that boy in the "Wargames" movie, probably it was him inspiring the "McGyver" series ! I still wouldn't exclude the possibility that the roms were buggy also at the beginning, I had ver...

Fascinating :) You are not using a CCP post-processing mod of some kind, are you ? In the meantime, I found an interesting point: ; PAL : 592 lines , NTSC: 23h x8 = 280 lines and not 262 (for the pure NTSC standard) 00000071: LD A,4Ah ; <<< 23h in the NTSC version Try the following: copy Tree4th.rom...

How it works on emulators is of no interest to me only insofar as it effects real equipment. Yeah, and they're often misleading.. I'd have never worked on a zx81 port for z88dk if I knew how far the xtender emulator was from the real thing !! Nevertheless they can be powerful and comfortable debuggi...

Interesting. On the screen being shifted on the top-right I noticed the same effect on EO, which should be fixable. The NTSC version does not seem to suffer the same problem, did you try it ? I don't know if there are compatibilty problem mixings the zx81 version and the h4 ROM versions. The strange...

While I'm on it, I must apologize with SirMorris for stealing his thread. I opened a specific one for "DStar 1" in the past but then I attached my stuff to this one messing up the things a little. So.. if everyone wants to enjoy the bells and whistles, please get the stuff at the earlier pages: I no...