Sinclair ZX80 / ZX81 / Z88 Forums

Yes, basically if you want a simple life poking the display file, make sure you're running 4K or more so that the display file is a known size.

Aww such a shame! Thanks for trying though...

Hehe welcome to the club... the ZX80core seems to be at just the level of difficulty to make it achievable by people like me, yet still a challenge and a learning experience. Maybe you too! I hope to be having another session testing it tonight, but at the moment I'm only able to get results in posi...

Hi there, I think the SHIFT key is supposed to be 'sticky', so you press SHIFT and it stays down, then you press the other key and both of them release. It's a pain, but in the old days Android touchscreens weren't much cop. It's a shame, because on a decent tablet nowadays you could actually have a...

Yep, I'm not out of ideas yet! But no chance to do it until tomorrow.

This is a very nifty little routine, actually! I'm impressed. As for your leading-space problem, it's actually very easily solved: POKE 16528,229 POKE 16529,205 POKE 16530,165 POKE 16531,10 POKE 16532,225 POKE 16533,35 Entering these before using it for the first time, you'll now find the line numbe...

It's 3.28K.

So does it work with manual power-off in position 0 ? You maybe have to do the reset longer, maybe you press to short. No, it doesn't. Unless I force /WR high while I'm doing it, and then let go of that once it's started. Otherwise it mainly stays red, with a couple of brief blinks of green before ...

OK. I'm now able to start up with the ZX80 image in position 4, and if I then move the switch to position 0 it continues to run. So it's accessing the ROM successfully in position 0. However, if I reset while in position 0, it does not start up successfully in that position. If I hold /WR high while...

Aha - thanks both of you. My biggest problem has been understand the switch circuitry - ridiculous really, since that's not even a part of the original ZX80 design. But I've improved my ability to read the schematic!