Sinclair ZX80 / ZX81 / Z88 Forums

The PSU supplied with my brand new Alphacom 32 is same as image here

A few years ago I measured output as 30V AC (RMS) offload, dropping to 27.7V at 0.87A when the printer was chugging away.

Interesting idea, you would have to use a diode in each of two dummy cells to drop to around 6V to Z88. Without you could overdischarge Li-on cells below the 2.4V limit without Z88 battery low symbol showing.

No, and that is why one of the first things I did after buying Z88 (in late 1980's) was to add a red LED in the mains adaptor. Too often I would be happily sitting there busily using Z88 thinking the mains was on, but I had forgotten to switch the damn thing on at the wall! Postscript: Meaning the b...

I don't generally use NiMH in Z88 since the fall off in voltage is quite quick and unexpected compared to alkaline (IMHO). I just use Duracells whenever I have a session using Z88 and don't want lose anything if it is left idle for a while.

I have a 128K Toastrack Spectrum which I haven't used in a while (just needs new membrane). Back in the day it wasn't too reliable when Interface 1 (IF1) and microdrives were attached, whereas my 48K Spectrum+ worked flawlessly with IF1 and microdrives. From what I recall the problem was that the Z8...

I can see how ZX97 adds new commands (albeit via FUNCTION 0-9) by adding CALL's in syntax and scanning etc. But I don't see how you can (as easily) add true functions (ie. unary like PEEK). I wanted to add IN (& OUT) but have had to resort to using PEEK (& POKE). If address is <256 then do IN or OUT...

For anyone with a QL & ZX81 here's the Basic I used to convert STC to SNG.

Ah, I didn't think to try pressing BREAK...

Excellent, I've got 32K battery backed RAM 8K-paged at 40-48K (for H4th Forth block filing). I can use that for temporary data.

Hi Tim, I'll tidy my ZX81 STC/SNG programs so they don't require my QL set up. I've also done programs to list completely contents of STC & SNG files, which make it easier to peruse song and samples/ornaments. Re ZX81 Tracker, I've only used it on EightyOne since (IIRC) it needs ZXpand for filing. M...

Moggy wrote : Again excellent work which hopefully will inspire others to create new music I must admit I found Andy's ZX81 SoundTracker much easier to use than Spectrum original. Waiting for pointer movement and getting it exactly in right place was tedious, and put me off using it in the past. And...