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→ROM Routines
These routines are defined in ROM:
* SCINIT $ff81 - Initialize and clear the character display
* CHRIN $ffcf - Input one character from keyboard (returns A(that is, the return value will be placed in the Accumulator register))
* CHROUT $ffdw - Outputs one character (A) to the screen at the current cursor position. Screen will wrap/scroll appropriately. Printable characters and cursor codes ($80/$81/$82/$83 for up/right/left/down) as well as RETURN ($0d) are accepted. Printable ASCII codes with the high bit set will be printed in reverse video.
* SCREEN $ffed - Returns the character screen size in the X and Y registers.
