Keyboard input/Keypress check: Difference between revisions
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If no key has been pressed, the program should continue without waiting.
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=={{header|6502 Assembly}}==
{{works with|https://skilldrick.github.io/easy6502/ Easy6502}}
Easy6502 uses zero page address FF as a memory-mapped port for keyboard input. The ASCII value of the last key you pressed is stored in this address, independent of the program's current execution state.
<lang 6502asm>define sysLastKey $ff
main:
jsr getKeyPress
jsr delay
jmp main
getKeyPress:
lda $ff
sta $00
rts
delay:
nop
nop
dex
bne delay
rts</lang>
{{out}}
<pre>
Pressing various keys results in the following:
0000: 73 ;lower case "s"
0000: 31 ;"1"
0000: 20 ;spacebar
</pre>
=={{header|Ada}}==
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