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Routines |
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27110 | LD E,A | E=ASCII code (32-127) | |||||||||||
27111 | LD D,215 | Point DE at the appropriate entry in the table of font character bitmap widths at 55072 | |||||||||||
27113 | LD A,(DE) | A=width of the font character in pixels (1-5) | |||||||||||
27114 | LD B,A | Store this in B | |||||||||||
27115 | INC D | ||||||||||||
27116 | LD A,(DE) | A=bit pattern for one pixel column of the font character | |||||||||||
27117 | CALL 27125 | Slide this into the message buffer | |||||||||||
27120 | DEC C | One fewer pixel column remaining in the message buffer | |||||||||||
27121 | DJNZ 27115 | Jump back until all pixel columns for the font character have been copied into the message buffer | |||||||||||
27123 | DEC C | One fewer pixel column remaining in the message buffer | |||||||||||
This entry point is used by the routine at 27419.
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27124 | XOR A | A=0 (blank pixel column) | |||||||||||
27125 | EXX | ||||||||||||
27126 | PUSH HL | ||||||||||||
27127 | LD C,8 | 8 pixels per column | |||||||||||
27129 | LD B,32 | 32 (during startup) or 8 bytes per pixel row (this instruction is set to LD B,8 before the game starts; see 21408) | |||||||||||
27131 | RRCA | Push a pixel into the carry flag | |||||||||||
27132 | RL (HL) | Drag the pixel into the message buffer and shove the existing pixels one place to the left | |||||||||||
27134 | DEC HL | ||||||||||||
27135 | DJNZ 27132 | ||||||||||||
27137 | DEC C | ||||||||||||
27138 | JR NZ,27129 | Jump back to collect the next pixel up | |||||||||||
27140 | POP HL | Restore the address of the last byte in the message buffer to HL' | |||||||||||
27141 | EXX | ||||||||||||
27142 | RET |
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