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Routines |
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Used by the routine at 30042. Slides the current contents of a row of the graphic buffer (at 60160, 60416 or 60672) one pixel to the left, and places the new pixel column into the slot freed up on the right.
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30097 | PUSH DE | |||||
30098 | EXX | |||||
30099 | POP HL | HL'=graphic buffer address | ||||
30100 | LD C,8 | There are 8 pixels to insert into the column | ||||
30102 | LD B,8 | There are 8 bytes per row in the buffer | ||||
30104 | RRCA | Push a pixel into the carry flag | ||||
30105 | RL (HL) | Drag the pixel from the carry flag into the buffer, and slide all the other pixels in the row one to the left | ||||
30107 | DEC HL | |||||
30108 | DJNZ 30105 | |||||
30110 | DEC C | Next pixel | ||||
30111 | JR NZ,30102 | Jump back until all 8 pixels have been inserted | ||||
30113 | EXX | |||||
30114 | RET |
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