Sinclair ZX80 / ZX81 / Z88 Forums

Hi all - I am back to working on this, its going along nicely but I am stumped. After I load a .P file to the proper location in memory (along with all the correct system variables) where should I jump into the ROM? I am only making use of the "NAME" routine to get the name they passed in LOAD " " t...

Ok so I have the keyboard working great as long as I wait for a key on the Adam. I am not sure what col / row I should return if no key is pressed. I see it starts out with H = FFh and L = FFh and I tried to return that is there is no key press but the ZX81 doesn't like it. Any tips on this? Edit: I...

Problems you might get 1) ROM-bug. Can you protect #0000-#1FFF against writing? If not, first addresses will be overwritten. 2) Reading IN-port (result can be different from machine you run or ZX81. Can be fixed with a scan and RST. 3) My games with "hidden" data on screen, can be emulated with cor...

Thanks again - I see it is storing it in LAST_K but I do not have any change on the screen so I have to dig a little deeper. This is what the system variables look like:

I recently got this in an ebay auction. It includes:

Persona A interface
MiniMap
DROM
Pericon C interface
and 2 64k Modules. I havent plugged it in yet. I am including a copy of the manual that came with it and the catalog that I scanned.

Hello All, I am currently working on a ZX81 emulator with a twist. This one runs in on a Coleco Adam. I have a good chunk of it working, I get it up to the 'K" prompt but I am stuck with keyboard input. Since the Adam is a Z80 system with free RAM in the right area I am able to load the ZXROM at 0h,...

HI Guys - I hope this is ok to list here:

https://www.ebay.com/itm/223042047544?ul_noapp=true

Bill

Looking for a working printer with a roll of paper for the ZX81 to complete my setup. Prefer a ZX81 branded one if possible - anyone have an extra for sale?

Bill H

Oh - I havent tried it yet, its brand new - got it from the person making them on eBay - has the latest firmware. Ok so I need to give it a go and see what happens.

Bill H

I received this last week and have yet to try it because I thought it used . P files but it doesn't so now I need a way to convert from . P to TZX

Bill H