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millfork/include/vic20_kernal.mfk

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// Routines from C16 and Plus/4 KERNAL ROM
#if not(CBM_VIC)
#warn vic20_kernal module should be only used on VIC-20 targets
#endif
// CHROUT. Write byte to default output. (If not screen, must call OPEN and CHKOUT beforehands.)
// Input: A = Byte to write.
asm void putchar(byte a) @$FFD2 extern