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Routines |
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Used by the routines at police, police_approach, police_exit_step1, police_face_left, oldwoman_approach, oldwoman_exit, oldwoman_rape, thief_enter_door, thief_escape_cleanup and thief_shot.
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Sets PAPER=1, then loops 17 ($11) times: PRINT AT D,10 + 7 space chars ($80). D starts at 0 and increments each row. Effectively blanks a vertical strip at column 10 — used to erase the police/thief/old-woman sprite after it has moved or been replaced.
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| erase_sprite_col | BDA0 | LD C,$11 | Set PAPER=1, D=0, E=$0A (col 10), outer loop C=$11 (17 rows) | |
| BDA2 | LD D,$00 | |||
| BDA4 | LD E,$0A | |||
| BDA6 | LD A,$11 | |||
| BDA8 | RST $10 | |||
| BDA9 | LD A,$01 | |||
| BDAB | RST $10 | |||
| erase_sprite_col_0 | BDAC | LD B,$07 | Inner: PRINT AT D,E + 7× space ($80) via DJNZ, INC D, DEC C, loop | |
| BDAE | LD A,$16 | |||
| BDB0 | RST $10 | |||
| BDB1 | LD A,D | |||
| BDB2 | RST $10 | |||
| BDB3 | LD A,E | |||
| BDB4 | RST $10 | |||
| erase_sprite_col_1 | BDB5 | LD A,$80 | ||
| BDB7 | RST $10 | |||
| BDB8 | DJNZ erase_sprite_col_1 | |||
| BDBA | INC D | |||
| BDBB | DEC C | |||
| BDBC | JR NZ,erase_sprite_col_0 | |||
| BDBE | RET | |||
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