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Routines |
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TEMPS | 03405 | XOR A | A is set to hold 0. | ||||
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 0 and the value in BORDCR instead. | |||||
03416 | LD L,(IY+14) | ||||||
TEMPS_1 | 03419 | LD (23695),HL | Now set ATTR-T and MASK-T. | ||||
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=0). | |||||
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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