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Routines |
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Used by the routines at COLOUR_PANEL and EXTRA_LIFE.
LIVES as two BCD digits into the buffer at pixel x 128, y 7, on the panel. Called when the panel is drawn (COLOUR_PANEL) and when an extra life is taken (EXTRA_LIFE), which then copies the two characters to the screen (BLIT_2X8).
LIVES counts in binary (START sets 5, NEW_LIFE takes one, EXTRA_LIFE adds one), so the display is right only while he has fewer than ten -- as in Knight Lore.
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| PRINT_LIVES | BA57 | LD DE,LIVES | one byte, LIVES, into the buffer at pixel row 7, byte column 16 | |
| BA5A | LD B,$01 | |||
| BA5C | LD HL,$D2F0 | |||
| BA5F | JP PRINT_BCD_NUMBER | |||
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This entry point is used by the routine at PRINT_CHAMBERS.
Print B bytes of BCD from DE into the buffer at HL, two digits each, the high digit first. Also used by PRINT_CHAMBERS for the chambers activated.
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| PRINT_BCD_NUMBER | BA62 | PUSH HL | the font itself as FONT_BASE: digits are codes 0 to 9 | |
| BA63 | LD HL,FONT | |||
| BA66 | LD (FONT_BASE),HL | |||
| BA69 | POP HL | |||
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This entry point is used by the routine at PRINT_SUMMARY_COUNTS.
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| PRINT_BCD_BYTE | BA6A | LD A,(DE) | the high digit | |
| BA6B | RRCA | |||
| BA6C | RRCA | |||
| BA6D | RRCA | |||
| BA6E | RRCA | |||
| BA6F | AND $0F | |||
| BA71 | CALL PRINT_CHAR | |||
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This entry point is used by the routine at PRINT_SUMMARY_COUNTS.
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| PRINT_BCD_LSD | BA74 | LD A,(DE) | the low digit; coming in here prints only the low digit of the first byte (PRINT_SUMMARY_COUNTS) | |
| BA75 | AND $0F | |||
| BA77 | CALL PRINT_CHAR | |||
| BA7A | INC DE | the next byte | ||
| BA7B | DJNZ PRINT_BCD_BYTE | |||
| BA7D | RET | |||
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