| Spectrum ROM | Routines |
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| TEMPS | 03405 | XOR A | A is set to hold +00. | ||||
| 03406 | LD HL,(23693) | The current values of ATTR-P and MASK-P are fetched. | |||||
| 03409 | BIT 0,(IY+2) | Jump forward if handing the main part of the screen (bit 0 of TV-FLAG reset). | |||||
| 03413 | JR Z,TEMPS_1 | ||||||
| 03415 | LD H,A | Otherwise use +00 and the value in BORDCR instead. | |||||
| 03416 | LD L,(IY+14) | ||||||
| TEMPS_1 | 03419 | LD (23695),HL | Now set ATTR-T and MASK-T. | ||||
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Next P-FLAG is considered.
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| 03422 | LD HL,23697 | This is P-FLAG. | |||||
| 03425 | JR NZ,TEMPS_2 | Jump forward if dealing with the lower part of the screen (A=+00). | |||||
| 03427 | LD A,(HL) | Otherwise fetch the value of P-FLAG and move the odd bits to the even bits. | |||||
| 03428 | RRCA | ||||||
| TEMPS_2 | 03429 | XOR (HL) | Proceed to copy the even bits of A to P-FLAG. | ||||
| 03430 | AND %01010101 | ||||||
| 03432 | XOR (HL) | ||||||
| 03433 | LD (HL),A | ||||||
| 03434 | RET | ||||||
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