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Routines |
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Used by the routines at KeepOnlyBitsThatAreSet and PlotPixel.
Asks the ROM for the display address of this pixel and builds the bit mask for it. E is counted up from the bottom of the screen, and the ROM turns that into the screen row.
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| PixelAddress | 62971 | PUSH BC | Call PIXEL_ADD. | |
| 62972 | LD B,E | |||
| 62973 | LD C,D | |||
| 62974 | CALL 8874 | |||
| 62977 | LD B,A | Take the column the ROM returned, count one further, and start the mask at 1. | ||
| 62978 | INC B | |||
| 62979 | LD A,1 | |||
| PixelAddress_Loop | 62981 | RRC A | Shift the pixel mask until it covers this column. | |
| 62983 | DJNZ PixelAddress_Loop | |||
| 62985 | POP BC | |||
| 62986 | RET | Return. | ||
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