PART FOUR - FIRST EXAMPLE |
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| LD HL, 16384 | 210040 | HL = Display File start |
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| LD BC, 6144 | 010018 | Bytes in display file |
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LOOP |
LD A, (HL) | 7E | Transfer bytes to A |
| XOR 255 | EEFF | Invert bits |
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| LD (HL), A | 77 | Put byte back |
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| INC HL | 23 | Next byte |
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| DEC BC | 0B | Decrement counter |
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| LD A, B | 78 | Test if 0 |
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| OR C | B1 | ||
| JR NZ, LOOP | 20F6 | If not, repeat |
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| RET | C9 | Else return to BASIC |
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