Sinclair ZX80 / ZX81 Forums

If you look at the continents across all brands, there’s a trend. E.g. with Commodore users in US had floppy; users in EU had tape. Therefore software in US was primarily on disk, and software in EU was primarily on tape. And because Sinclair was a European country, it had the European thinking that...

So if someone just want the real thing, one just appeared on eBay: https://www.ebay.com/itm/153561929093

If you want to load a program that’s more than 16k you need to change RAMTOP before load, otherwise the load fails.

This might not be a problem on all emulators, because they want to “help” you. However it will not work on real hardware, if RAMTOP has not been changed prior to load.

If you have a ZXpand, you can load the software with LOAD “SOFTWARE STOP ”, where STOP is a keyword. ZXpand emulation is available on EightyOne as well.

If you have real hardware with tape loading, I’ve read you can load with RAND USR 836 to stop auto-run. (This I’ve never tried myself.)

Will ZX81 hardware work with Spectrum or 2068? ZXpand or any other hardware that replaces the ROM needs a custom Spectrum or 2068 ROM. However the ROM on Spectrum is 16k, and e.g. ZXpand only supports 8k. (Maybe replacing the first 8k is ok, and just use the internal upper 8k from the Spectrum.) Nex...

I just used 5 resistors in my circuit.

Velkommen.

We are a few from Denmark here already.

If you have some stuff for the ZX81 in Danish. I’ve scanned an issue of ZXdata’s Danish magazine ZinX, and posted it here in the forum.

If you follow the schematic for joystick you will not get 5, 6, 7, 8 + 0.

This schematic will give you 6, 7, 8, 9, 0.

I would advice just to tap into the keyboard matrix to get any keys you want.

I just shorted wires one by one to find the key.