Sinclair ZX80 / ZX81 / Z88 Forums

I’m not trying to do diagonal movement, or have multiple key presses. I think some confusion has occurred. I am only moving left and right. But I have multiple enemies onscreen. I didn’t find my left and right controls to be responsive enough, because INKEYS only works when the program is at that li...

The root of my problem is that the window of opportunity for inputing a command rushes past too fast with INKEYS. I didn’t know until now that some computers other than the ZX81 need a number after their INKEYS command, to define how many milliseconds the computer waits for an INKEYS command before ...

XavSnap wrote: ↑Sun Jul 23, 2023 9:48 pm Hi,
Mr. Vertigo, prefer this "LET" syntaxe:
[equal symbol]
20 IF K$="q" THEN LET Y=Y-1

Should be: [FASTER]
10 LET X=X+(INKEY$ AND "P")-(INKEY$ AND "O")
20 LET Y=Y+(INKEY$ AND "A")-(INKEY$ AND "Q")

This looks promising! I’ll give it a try. Thanks!

1024MAK wrote: ↑Sun Jul 23, 2023 9:03 pm An alternative is to only perform one action per main loop other than checking the keyboard.

Use a counter to determine which action occurs on which iteration of the loop.

Mark

Nice idea!

I’ve found putting a For/Next loop around the Inkeys routine helps, but it seems like a bizarre solution

10 LET K$=INKEY$ 20 IF K$="q" THEN LET Y+Y-1 30 IF K$="a" THEN LET Y+Y+1 40 IF K$="o" THEN LET X+X-1 50 IF K$="p" THEN LET X+X+1 That’s the method I’ve been using, but I have a few “enemy” movements within my loop, and the control keys are VERY unresponsive. So I tried having a few Inkeys functions...

If you’re making a game in BASIC on the ZX81, and you have a couple of movement routines controlling enemies, what is the best way to get an INKEYS movement from the player to feel responsive? Do you have to place a few inkeys checks throughout the game loop? Is it better to peek last_k, or does tha...

I will study them with interest!

That would be a busy screen

Thank you! I was thinking an array must be involved somehow, but I couldn’t think how. As you say, probably not something I’d use in the real world, but I just couldn’t think how it could be done. When using machine code on the ZX81 would there be a limit to how many missiles and enemy missiles coul...