Sinclair ZX80 / ZX81 / Z88 Forums

First train running.....


https://youtu.be/BfY3Z6ZHd44

As said.... a thread about my new traingame. I will call it TRAINSPOTTER. I started today and the first thing I "invented" was a very small PLOT/UNPLOT routine. In my mind I had an idea about trackchanging but later I had a better idea. The first thing I started coding was a small track and how the ...

DEC DE does not set any flag.

For my latest (not fully released yet) game WORLDCAFE I asked you all to help me with lands for in the cafe. Those who replied got the game this week and the rest of you will get the game when MAY THE 4TH is with you :) However.... i all my released games a small line is mentioned : FREEWARE, BUT FE...

marste wrote: ↑Wed May 01, 2024 10:53 pm I missed this!...
Pacman was missing in the 1k titles, and this release is ... WONDERFUL!!!
Compliment as usual Johan!!!

Be aware: a few posts further is an updated version with bonuslive.

If it is a problem of timeout waiting for a signal, a trick maybe to wait for the signal in the "pre loading" setup part, and immediately jump to the loop as soon as the signal is detected! (code size there do not count :)) That is exactly what I am doing, except the signal of the cassetteport is n...

I had an idea how to solve the ROM-loader in the final step.

EightyOne does not seem to read the tape when not in the ROM.
So it might only work on real hardware.

The program with the small loader never gets to the LD (HL),C since the ROM takes off the RET in IN-BYTE when tape is waiting for a signal. The IN-BYTE must be customized too for a loader. ;; IN-BYTE L034C: LD C,$01 ; prepare an eight counter 00000001. ;; NEXT-BIT L034E: LD B,$00 ; set counter to 25...

Ok, my findings sofar:

On EightyOne you can only get it a bit working when using WAV-loader.
With .P and .TZX EightyOne uses a different loading trick.

Even with WAV I don't return to the loader I defined (yet).

D was set to same highbyte as RET-address and test in ROM sees that as a stop in loading.
After the LDIR I did a INC D and now tape stays in loader.

Next step is actual loading.