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007D: THE 'SKIP-OVER' SUBROUTINE
Used by the routine at GET_CHAR.
The value brought to the subroutine in the A register is tested to see if it is printable. Various special codes lead to HL being incremented once or twice, and CH-ADD amended accordingly.
Input
A Character code
Output
SKIP_OVER 007D CP $21 Return with the carry flag reset if ordinary character code.
007F RET NC
0080 CP $0D Return if the end of the line has been reached.
0082 RET Z
0083 CP $10 Return with codes +00 to +0F but with carry set.
0085 RET C
0086 CP $18 Return with codes +18 to +20 again with carry set.
0088 CCF
0089 RET C
008A INC HL Skip over once.
008B CP $16 Jump forward with codes +10 to +15 (INK to OVER).
008D JR C,SKIPS
008F INC HL Skip over once more (AT and TAB).
SKIPS 0090 SCF Return with the carry flag set and CH-ADD holding the appropriate address.
0091 LD ($5C5D),HL
0094 RET
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