Sinclair ZX80 / ZX81 / Z88 Forums

Reboot wrote: ↑Thu May 11, 2023 7:56 am I noticed there is a memotech HRG emulation edge fail case that only occurs when NTSC=1 (60Hz checkbox).

This should now be fixed in the newly released v1.38!

With "v1.37", a connected USB device (Simple 8-bit Data storage) will not be activated via the selection. But this procedure works with "V0.43b" or "V0.52". I found a change from v0.52 to v1.0 which I think was the cause, and it now seems to work. I have not exhausted tested the drive functionality...

Thanks. I have followed your steps with v0.52, v1.0 and v1.0a and it seems the functionality was broken way back in v1.0 (10th March 2008!)...

Version 1.37 has just been released and is available from here . Hello, A quick question, about my small problem: My tests with Eightyone have shown that only after using the Eightyone version e.g. "V0.43b" or "V0.52" even in the latest "Version 1.37", the 8-bit Volume are recognized (connected to ...

Reboot wrote: ↑Thu May 11, 2023 7:56 am I noticed there is a memotech HRG emulation edge fail case that only occurs when NTSC=1 (60Hz checkbox).
The attached file is best run at speed32.

Thanks for the file. I was able to reproduce the issue and have a fix lined up for inclusion in the next release.

It seems everyone was far too canny to fall for my ruse of announcing the seemingly implausible claim of a ZX80 dual ROM loading technique on April Fool’s day! :lol: But the technique is indeed real and here the source code for it: ZX80_Dual_ROM_Load_Demo.asm The demo simply deploys one of two paylo...

Version 1.37 has just been released and is available from here . A number of the ROMs that are included with EightyOne have been renamed and restructured into subfolders. You should delete your existing EightyOne installation before copying on the new files. When run, EightyOne might warn it can't f...

I have a (possibly foolish) question. I'm using memory view to see what changes when I do something at the ZX80 prompt. The viewer colours Red any memory cell that has changed, so you can easily spot that. However, is there a way to reset the memory viewer, so that nothing has changed, to set a new...

Hi Marc I've just sent a PM to you about Flight Simulation. Hitting the nail on the head, sir! I understand now. Not only Sinclair Egypt (actually the Matisco Trading & Inv. Co. of Cairo) but also Beckman in Sweden used this technique. The switch looks nicer though, it can be reached from the edge c...

Adding an Investrónica tab would be a great idea! There is a Timex tab so an Investronica ones seems appropriate. There aren't significant hardware differences, just the ROMs, but it could useful for those models to have have their own tab. For the Spanish 128, the 128 BASIC editor was significantl...