Sinclair ZX80 / ZX81 / Z88 Forums

Good point, the expression evaluation involves the internal stack based FP calculator which is compact and powerful but damn slow. i.e. compare the time it takes printing a constant (like PRINT 1) and a text string (as PRINT "1"). Your suggestion permits little more optimizations, in example, your s...

Painful to say, but my choice for the linux box is EightyOne running over WINE, the 'p' file can be passed at the command line without problems even if it is outside the 'c drive' path.

Wow, thankyou for the warm welcome ! Well, I'd love to get the ZX80 in the list of the supported machines, but the flickerless video output with no extra hardware circuits is.. well, something I don't think I'm able to get. Probably it is possible to port z88dk to it, but believe me when I say I nev...

Ok, I'm quite sure your'e trying to recover a copy of this:
"SuperPrograms6(ICL)" http://www.zx81stuff.org.uk/zx81/genera ... (ICL).html
I'd skip the first 6 tracks and look at the end of the tape.

Did not recover it fully but it looks it is a game, named "GALACTIC INVASION".
Does this help you memory ?

They use their own routines.
In fact it is quite a tricky method, since a memory expansion is needed the spare 1K byte of internal memory is used to overlap the first KB in ROM, which is copied onto it and patched.
Obviously the drawing instructions are in the new ROM too.

Bob, I just discovered your games and I'm impressed, wow, you're reviving the 'MAZOGS' spirit !
Really, I love the way you are using the zeddy's CHR$ set.

Forgive the very ignorant question: what is the simplest way to get a visible picture on a new-ish TV set with an old ULA ? I'm afraid I have the earlier one because the picture is almost totally black (which did not happen with all the B&W TV I tried in the past). Mine is a Timex 1000, thus probabl...

Errm, the original source code should be capable of running on quite a few different configurations (I build also a ZX Spectrum IF2 ROM version, not counting the Jupiter ACE and the Sorcerer Exidy UDG mode versions). Some possible options with the ZX81: - standard text mode - redefinable characters ...

Hmm.. I'd say:

40 POKE 16806,CODE INKEY$-20

..or 15 or less if you want it even slower
Enjoy