Sinclair ZX80 / ZX81 / Z88 Forums

The current nightly build should be fine, a patch for the last v1.10 is on its way.
There's one thing I should warn about, the keyboard scanning is now case sensitive also on the ZX81, thus by default you get lowercase ASCII codes.

The z88dk's appmake tool now is able to generate wav also basing on third party programs (dumb mode).
A speed-up option is included-

In the meanwhile a have a hint to tune speed:
the constants for delay are stored in 19846 and 19848.
If your ZX81 runs too fast, try POKE 19846,2 to slow down the game a bit

IX register is not a problem on the vanilla zx81, since we're not worrying for the 8K ROM retrofit, then we're set. I noticed that the SAVE routine on the ZX80 overwrites all the system variables, including the pointers to the various SP, so passing from a bigger to a smaller memory model could be a...

They're close relatives.. so cute, so cheap ..no I'm not referring to the video above !

Ok then, I had a glance at the original zx80 ROM disassembly and its main peculiarity is not having the NMI handler at all. This is both bad and a good news, because it is not possible to apply most of the tricks I used for the ZX81 but on the other side we do not have to worry to preserve the ix re...

This is one of the valid options, it is slower but saves 100 bytes and leave things more readable and portable (most of the calls we're using work on the ZX Spectrum, in example). Other console driver interfaces give even more compatibility. Forgive the buggy hack, I was just trying to give some hin...

Very nice effect, but you could get the same result with much less effort with the latest z88dk libs.
SirMorris drove me crazy to get the console stuff acting right

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.