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Routines |
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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.
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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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