Search found 51 matches

by kpalser
Mon Jul 02, 2018 7:41 pm
Forum: Sinclair Misc
Topic: Russell J Marks - is anyone in contact?
Replies: 0
Views: 488

Russell J Marks - is anyone in contact?

Hi Folks, I'd like to get in contact with Russell Marks, the author of the Z81 emulator (his code base was a starting point for other modern emulators): http://www.svgalib.org/rus/z81.html He doesn't seem to have been active since October 2004 according his change log. And his email address in the f...
by kpalser
Sun May 13, 2018 10:28 pm
Forum: Hardware
Topic: ZON X-81 vs ZON X
Replies: 0
Views: 323

ZON X-81 vs ZON X

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...
by kpalser
Thu Mar 15, 2018 10:00 pm
Forum: GAMES
Topic: Copyrights for New Generation Software games (e.g. 3D Monster Maze)
Replies: 5
Views: 664

Re: Copyrights for New Generation Software games (e.g. 3D Monster Maze)

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...
by kpalser
Sat Mar 03, 2018 11:13 pm
Forum: GAMES
Topic: Copyrights for New Generation Software games (e.g. 3D Monster Maze)
Replies: 5
Views: 664

Copyrights for New Generation Software games (e.g. 3D Monster Maze)

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...
by kpalser
Wed Dec 20, 2017 9:19 pm
Forum: Development
Topic: Metropolis, a proper ZX80/81 demo
Replies: 21
Views: 1804

Re: Metropolis, a proper ZX80/81 demo

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 ...
by kpalser
Wed Dec 20, 2017 9:06 am
Forum: Development
Topic: Metropolis, a proper ZX80/81 demo
Replies: 21
Views: 1804

Re: Metropolis, a proper ZX80/81 demo

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...
by kpalser
Wed Dec 20, 2017 12:53 am
Forum: Development
Topic: Metropolis, a proper ZX80/81 demo
Replies: 21
Views: 1804

Re: Metropolis, a proper ZX80/81 demo

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 ...
by kpalser
Sun Dec 17, 2017 6:26 pm
Forum: Development
Topic: Metropolis, a proper ZX80/81 demo
Replies: 21
Views: 1804

Re: Metropolis, a proper ZX80/81 demo

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...
by kpalser
Sun Oct 15, 2017 5:06 pm
Forum: Sinclair Misc
Topic: TS1500 - Portugal?
Replies: 2
Views: 407

Re: TS1500 - Portugal?

by kpalser
Sun Oct 15, 2017 2:38 pm
Forum: Sinclair Misc
Topic: TS1500 - Portugal?
Replies: 2
Views: 407

Re: TS1500 - Portugal?

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.