Sinclair ZX80 / ZX81 / Z88 Forums

marste wrote:Sorry, forgot to mention in the post: should be machine code (and should consume as minimum amount of byte as possible)!...

PS: I already tried something similar but seems to fast even repeating it few times:

LD B,0
WAIT: DJNZ WAIT

Sorry, forgot to mention in the post: should be machine code (and should consume as minimum amount of byte as possible)!...

After having discussed the user input here I'm for the next help request! (hope the result of my efforts will be nice surprise for this community! 8-)) The problem is simple: how to wait some predefined fraction of second (with minimum space requirement)? I do not need to do anything in the meantime...

Would you consider returning from the machine code to just do the INPUT in BASIC? This will be the easiest and probably the smallest. Yesss!... I was thinking the same! :) The following code gets the A$ at line 110 from NXTLIN and some increments and stores this at CH-ADD. It then calls "look-vars"...

Regarding this new variant seems to work too //...// (and I have the same curiosity on how is possible to return back to the same place after a jump! :)) I tried to change the last instruction instead of "jp endofprogram" to "jp startofprogram" but seems it is not working (the program ends anyway w...

You're right! And this seems to work too and is two bytes shorter. It just interprets "INPUT A$". Regarding this new variant seems to work too!! :D :D I had to "rewrite a bit for TASM to work: startofprogram: .org 4082h ld hl,instructiontextinputadollar ld (4016h),hl ; CH_ADD jp 0CDEh ; LINE-NULL ?...

In the code in the attachment ... It works! :D Before seen your last answer I tried to disassemble myself and seems I did despite 25+ years of not using Z80 code anymore! (btw never used it on ZX81) rem content to run: 33 21 LD HL,408E ; 16526 -> A$ ADDRESS OF THE PRINT STATEMENT 142 8E 64 40 34 22...

I need to read in assembly ZX81 a little string as user input. I've seen various routines that allow to read it 1 character at a time. I was wondering if there is a possibility to call the standard basic subroutine that perform the instruction "INPUT A$". It will have various advantages: 1. should b...

Happy to test!

PS:

Tryed F8 with an old Windows XP computer and everything run fine!
(should I rob my daughter of her computer? )