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Routines |
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74D8 | LD HL,$E608 | Decrement Sam's main action timer in byte 0x08 of his buffer | ||||||
74DB | DEC (HL) | |||||||
74DC | RET NZ | Return unless it's time to deal with Sam | ||||||
74DD | LD HL,$74F3 | We will continue at 74F3 (below) after calling the routine to handle Sam | ||||||
74E0 | PUSH HL | |||||||
74E1 | LD L,$C6 | HL=74C6 | ||||||
74E3 | LD A,($7FFC) | Pick up Sam's status flags from 7FFC | ||||||
74E6 | INC L | Point HL at one of the entries in the table of Sam-handling routine addresses at 74C8 | ||||||
74E7 | INC L | |||||||
74E8 | RLCA | |||||||
74E9 | JR NC,$74E6 | |||||||
74EB | LD C,(HL) | Collect the routine address into BC | ||||||
74EC | INC L | |||||||
74ED | LD B,(HL) | |||||||
74EE | PUSH BC | Push it onto the stack, ready for an indirect jump | ||||||
74EF | LD HL,$E600 | Point HL at byte 0x00 of Sam's buffer | ||||||
74F2 | RET | Make an indirect jump to the Sam-handling routine | ||||||
We come here after the Sam-handling routine has returned.
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74F3 | LD HL,$7FFC | 7FFC holds Sam's status flags | ||||||
74F6 | LD A,(HL) | Pick them up in A | ||||||
74F7 | AND A | Has Sam finished the action yet? | ||||||
74F8 | RET Z | Return with the zero flag set if so | ||||||
74F9 | LD A,($E608) | Collect Sam's main action timer from byte 0x08 of his buffer | ||||||
74FC | AND A | Did the Sam-handling routine set the action timer to a non-zero value (meaning that the action is still in progress)? | ||||||
74FD | RET NZ | Return with the zero flag reset if so | ||||||
74FE | LD (HL),A | Otherwise clear all of Sam's status flags at 7FFC | ||||||
74FF | RET | Return with the zero flag set |
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