Sinclair ZX80 / ZX81 / Z88 Forums

Hi AY Gurus, I’m planning to add ZON support to my emulator. Looking at resources like: https://k1.spdns.de/Vintage/Sinclair/80/Peripherals/Bi-Pak%20ZON%20X-81%20Sound%20Module/ https://k1.spdns.de/Vintage/Sinclair/82/Peripherals/Bi-Pak%20ZON%20X%20Sound%20Module/ and then the source code for Eighty...

I was given the email address of Mr Caen the CEO of Interplay a couple of days after my post. Unfortunately, there was no response nor automated delivery failure message. Either after all these years they cannot confirm ownership or it is not in their interest to respond. I hope that the portfolio o...

Posting here the result of my search for answers with the hope that someone else might have information to get past an impasse. Since 3D Monster Maze is such as a well known and loved title I’ve been looking into obtaining permission to bundle it with the iOS emulator app. If you read my previous po...

Hi Adam, Thanks for all your efforts. Version 1_1 for ZX81 seems to have done the trick: horizontal position is consistently the same (only 6 pixels off centre to the right), no other scrambled video. I still need to add the vertical blanking interval this weekend. In particular I want to see if it ...

I need to digest the comments above properly - the working day is about to start.. Initial thoughts after sleeping on this I think that the black bar is the hsync pulse outside the hsync acceptance window. And that following the recent change in my CRT emulation code for the vertical sync trigger du...

Hi Adam, Bearing in mind that I haven't fired it up on a real ZX81 yet - attached is what the latest version looks like on my emulator. The horizontal position is now always consistent but a black bar is now present with a scrambled image to the right of it. Hopefully this is just limited to a just ...

Hi Adam and other video display experts, I popped the ZX80 and ZX81 versions of the demo into a development version of my ZX81 emulator iOS app. The screen started to roll. So I experimented with the vertical sync window in the CRT emulation code to no avail and then looked at the Adam's code. I was...

Answering my own question: https://beta.collectorsbridge.com/colle ... =1&slide=4

As a side point, I contacted John Grant of NineTiles to ask if they made the changes to the ROM code and received any loyalties. He doesn't have any recollection of being involved with the Timex computers and there was no licensing agreement. Paid by hour.

Hi, I've read that the TS1500 was built at a Timex factory in Portugal. The TS1000 wiki page https://en.wikipedia.org/wiki/Timex_Sinclair_1000#Timex_Sinclair_1500 also says it was sold there. Is this true? Did Timex go to the trouble of making PAL versions of the TS1500 with a Portuguese user manual...