Spectrum ROM | 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 | 00125 | CP 33 | Return with the carry flag reset if ordinary character code. | ||||
00127 | RET NC | ||||||
00128 | CP 13 | Return if the end of the line has been reached. | |||||
00130 | RET Z | ||||||
00131 | CP 16 | Return with codes +00 to +0F but with carry set. | |||||
00133 | RET C | ||||||
00134 | CP 24 | Return with codes +18 to +20 again with carry set. | |||||
00136 | CCF | ||||||
00137 | RET C | ||||||
00138 | INC HL | Skip over once. | |||||
00139 | CP 22 | Jump forward with codes +10 to +15 (INK to OVER). | |||||
00141 | JR C,SKIPS | ||||||
00143 | INC HL | Skip over once more (AT and TAB). | |||||
SKIPS | 00144 | SCF | Return with the carry flag set and CH-ADD holding the appropriate address. | ||||
00145 | LD (23645),HL | ||||||
00148 | RET |
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