Sinclair ZX80 / ZX81 / Z88 Forums

It’s moved to http://www.zx-modules.de/

Reading zxdocs I see what you say. Basic Vars can be above $C000, but Basic code cannot because the D-file has to be below. 48K RAM RAM is located at 4000h-FFFFh, same restrictions as for 32K RAM apply. The memory at C000h-FFFFh can be used as data storage only, but not for machine code execution, a...

I think we misunderstand each other.

I asked: Why not set the RAMTOP to FFFF?

Because this memory will be fine for all except executing ML.

I assume Basic lines can be there, and I assume Basic Vars can be there. Only problem will be if D-File is on top of the $8000 address.

Paul wrote: ↑Thu Aug 15, 2019 5:51 pm The tape version for zxpand is now being tested.

Hi Paul

Anything keeping you from sharing the dumped ROM? I know I will not be able to print without one of Memotech”s I/F, but I’m curious to see the software. And maybe I can use it with ZXblast dump feature, or patch it for ZXpand.

But this is only a limit for ML. Basic should have no problem using all memory, right?

This modification will be to set the RAMTOP, so you don’t need to set it yourself with POKE/NEW, right?

Why not test the full RAM, to get RAMTOP set right from the start.

Any reason why RAM check can't go to FFFF?

To my knowledge the only emulator supporting ZXpand is EighthOne. ZXpand support is needed.

The German ZX-Team has made a few of the keyboards with PCB and custom keys. It seems the fabrication of custom keys are only done by few companies world wide, and are very expensive in small volumes. Since this is spare time and private funding I think it will be another year before it's publicly a...

As for Break on/off: Being able to disable Space, so it will not send Break, cannot be implemented in hardware alone. As there is no hardware distinction between Space and Break. Here the ZX81 system ROM has to be updated. E.g. ZXpand can be configured so break is Shift-Space/£ instead, but this is ...

REP ON/OFF is most likely repeat on/off.