Check output device is a terminal: Difference between revisions
Check output device is a terminal (view source)
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=={{header|6502 Assembly}}==
{{works with|Commodore 64}}
<lang 6502asm>LDA $D011 ;screen control register 1
AND #%00100000 ;bit 5 clear = text mode, bit 5 set = gfx mode
BEQ isTerminal</lang>
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