Sinclair ZX80 / ZX81 Forums

Don't get me wrong,Lardo, as from a collectors point of view they are an excellent acquisition but just not up to par mechanically. The contacts apart from being very thin and flimsy seem to oxidise/wear quickly and this manifests itself after a time by certain keys needing a second or more firm pre...

I think having to wait 10 minutes before it prints anything is a bit of a downer, it would be quicker to draw the graphics with a pencil.

Excellent news Paul , It would be nice to see my Alphacoms would working on the 80.

Found it! The code is on the second page of the article. https://archive.org/stream/ZX-computing-1984-10/ZXComputing_Oct-Nov_1984#page/n119 Happy printing. :lol: I now recall the reason for the better print quality was due to using an under powered power pack which ran the motor and the printer styl...

I thought you might be Paul as God knows I have thrown enough printer paper your way. :lol: I mentioned it some time ago on this thread but for some reason the links no longer work for me! https://www.sinclairzxworld.com/viewtopic.php?f=7&t=314&p=2350&hilit=printer+zx80#p2350 EDIT I may have got my ...

A vanilla ZX80 couldn't print a thing on the ZX PRINTER, the NEWROM (which was the ZX81 ROM retrofitted on it) was the only way to fill the gap.. until now ;) I think I mastered the ROM portion of the ZX PRINTER enough to be able to provide valid custom drivers, so here's an example for the ZX80, i...

Found it!! A video of a 2c184 ULA being de-capped and showing its various interconnections, it's French language but the picture should suffice. The relevant bit starts about 8 mins in and if you pause the video at 10:07 you can compare the ULA cell matrix to the one in the pdf posted by Andy, they ...

White key one just like mine, but if you give it some stick and not use it once a year like most people the legends come off faster than a hookers drawers and the crappy thin sliding switch contacts likewise (had mine 30 years along with other external keyboards so know the difference). Memotech loo...

I'm almost sure Mark posted something re this PDF some time ago and gave an explanation of the ULA's heat output being due to,amongst other things, a collection of voltage regs scattered about the chips periphery. As for the decapping I have seen a collection of stills for the 81(I'm aware of the ma...

gammaray wrote: ↑

Fri Jul 06, 2018 11:27 pm

I am going to put a heatsink on mine!

My attack moggy (Keith) loved this so much he asked me to post this.

He also muttered some thing about booking a flight to the lone-star state for him and his M16 to enjoy a short hunting holiday.