Sinclair ZX80 / ZX81 / Z88 Forums

Hi Xav... And the direct access of VB81 ... in a directory. I *could* do this... but VB81 only deals with 1 ROM. Would VB81 still allow this if you replaced ZX81.ROM with ZX80.ROM, or TREE4TH.ROM, or AZMITH.ROM etc. ? Writing code to intercept load/save for every ROM included in EO is a huge effort ...

Yes, the Spectrum kempston and Protek (Cursor key) joystick interfaces should "just work" on the ZX81. The only issue with the Kempston is that you can't read it in BASIC due to the ZX81 having no IN keyword. Not an issue with M/C programs though.

Mike

Just one obvious comment from me...

On my ZX81, there's only three colours, not four - Black, Red and Light Grey. The keywords above and below the keys are the same colour as the key background itself. Likewise, the block graphics don't use a different background colour.

Mike

Can I ask the people for whom AY emulation doesn't work, which OS you're using along with which version of EO?

Thanks,
Mike

I remember seeing these years ago... It's a replacement keyboard that it stuck on top of the original by double sided tape. I can't remember if the rubber buttons press down onto the usual flat keyboard or whether they have their own key matrix inside. However, it is a stick on aftermarket keyboard....

yerzmyey wrote:Regarting another disscussion, maybe You could add emulation of this AY interface to ZX81/TS1000?
The interface is called Zon-X, I believe.

I would, except I already added it around 2 years ago

Mike

I've just been looking into the specifications of the .AY file format :o It seems it's not really a file format as such - but a z80 program the player "runs". As such, all the port addresses are hard coded into the .ay file, and it makes assumptions about the memory map that it's running in. I don't...

I'll leave sirmoris to sort out the debugger. Ah, the power of deligation :) Regarding the keyboard mapping, I'll fix that asap. The problem stems from the fact that EightyOne has been developed entirely on a laptop - hence the numeric keypad functions have never really been tested by myself. Mike [...

... and here's a little table with all the ports on it:
Mike

From my source code (Which may or may not be correct ;) ) 128k spectrum 1.7734 MHz Timex 1.764 MHz ZON-X 1.625 MHz Fuller 1.625 MHz QuickSilva 0.8125MHz As you can see, the Spectrum and Timex are quite close, whereas the ZX81 boards use a slightly slower clock - probably as a result of the spectrum ...