Sinclair ZX80 / ZX81 / Z88 Forums

Oh! Great! Thanks!

Are they available for download? They could be cool tests for a 48K mod

Sometimes you wonder how it could work at all. :shock: Maybe because device manufacturers publish very conservative specifications. Take for instance the LM1889 used in 16K/48K Spectrums: a NTSC video encoder without provision to encode PAL signals (which need a phase inversion every other line) be...

gozzo wrote:'Pokemon' is pretty much right! You really need to read the book

My fault! Seems that I didn't need that information to clone the ULA
So... it appears to be that someone has a large pile of NOS ZX81 ULA's ?

so I go off hunting. I did a quick search on DigChip for 2C210E and sure enough there it is: stock levels: 10,000+ Well, that's weird. The Ferranti ULA 2C210E is a custom chip that needs the customer to provide the metalization layer in order to "personalize" the chip. The Spectrum uses a Ferranti ...

Thank you all for the welcome! :) BTW: I assume this is old and known by all you, but in case anyone is afraid to upgrade internally his/her ZX81, I've prepared a graphic tutorial about how to do it that I posted yesterday. Text is in spanish, so I will link you to a google translated version. http:...

Something like this, maybe?



Or maybe this one? . The two previous were 32x32. Standard size for favicon is 16x16, so it must be as simple as it can if you want to keep "readable".

May I also add that the site lacks a favicon ? It's very useful when you have a lot of forums and sites in your links bar because you may only leave the icon and delete the name of the site, so more sites fit in the bar. Something like this...

Yay! Thanks!

Hi all! My name is Miguel Angel. I'm also known as mcleod_ideafix at WOS and other forums. I've found this forum while in search for ZX81 demos. Some time ago, I was lent a ZX81 program that its owner had from the 80's and I wanted to preserve it. I recorded the sound at my office and went home with...