Routines |
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TEMPS | 0D4D | XOR A | A is set to hold +00. | |
0D4E | LD HL,($5C8D) | The current values of ATTR-P and MASK-P are fetched. | ||
0D51 | BIT 0,(IY+$02) | Jump forward if handing the main part of the screen (bit 0 of TV-FLAG reset). | ||
0D55 | JR Z,TEMPS_1 | |||
0D57 | LD H,A | Otherwise use +00 and the value in BORDCR instead. | ||
0D58 | LD L,(IY+$0E) | |||
TEMPS_1 | 0D5B | LD ($5C8F),HL | Now set ATTR-T and MASK-T. | |
Next P-FLAG is considered.
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0D5E | LD HL,$5C91 | This is P-FLAG. | ||
0D61 | JR NZ,TEMPS_2 | Jump forward if dealing with the lower part of the screen (A=+00). | ||
0D63 | LD A,(HL) | Otherwise fetch the value of P-FLAG and move the odd bits to the even bits. | ||
0D64 | RRCA | |||
TEMPS_2 | 0D65 | XOR (HL) | Proceed to copy the even bits of A to P-FLAG. | |
0D66 | AND %01010101 | |||
0D68 | XOR (HL) | |||
0D69 | LD (HL),A | |||
0D6A | RET |
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