|
Routines |
| Prev: A1AF | Up: Map | Next: A20C |
|
Used by the routines at FollowRecordPointer, MatchWordAgainstEarlierClause, ProcessTextTokenStream, FollowLinkPointer, CopyLinkAhead, CopyPointerToStack, DispatchCharacterScript, GetScriptPointer, ReleaseNextDisplayRecord and CopyClockLink.
Follows one linked record, stores its link, and clears the marker after that link.
|
||||
| ProcessMemoryEntry | A1C7 | PUSH HL | Save the pointer, the source and the character record. | |
| A1C8 | PUSH DE | |||
| A1C9 | PUSH IX | |||
| A1CB | POP HL | Step back over the block header and point IX at the free-space list (9FE3). | ||
| A1CC | DEC HL | |||
| A1CD | DEC HL | |||
| A1CE | DEC HL | |||
| A1CF | LD IX,$9FE3 | |||
| ProcessMemoryEntry_Loop | A1D3 | LD E,(IX+$00) | Read the record's flag byte and read the moved marker. | |
| A1D6 | LD D,(IX+$01) | |||
| A1D9 | LD A,D | Jump ahead to ProcessMemoryEntry_Next if the pointer is zero. | ||
| A1DA | OR E | |||
| A1DB | JR Z,ProcessMemoryEntry_Next | |||
| A1DD | PUSH HL | Compare HL with DE, keeping a copy of HL. | ||
| A1DE | AND A | |||
| A1DF | SBC HL,DE | |||
| A1E1 | POP HL | Restore HL from the stack. | ||
| A1E2 | JR C,ProcessMemoryEntry_Next | Jump ahead to ProcessMemoryEntry_Next if HL was below DE. | ||
| A1E4 | INC DE | Step the source on two bytes, copy it into the record, and go to ProcessMemoryEntry_Loop. | ||
| A1E5 | INC DE | |||
| A1E6 | PUSH DE | |||
| A1E7 | POP IX | |||
| A1E9 | JR ProcessMemoryEntry_Loop | |||
|
Stores the link in the record flag, clears the marker after that link, and stores the source address.
|
||||
| ProcessMemoryEntry_Next | A1EB | LD (IX+$00),L | Store the record's flag byte and store the moved marker. | |
| A1EE | LD (IX+$01),H | |||
| A1F1 | INC HL | |||
| A1F2 | LD (HL),$00 | Clear the marker after the link. | ||
| A1F4 | INC HL | Call CalculatePointerOffset to calculate pointer offset. | ||
| A1F5 | LD (HL),E | |||
| A1F6 | INC HL | |||
| A1F7 | LD (HL),D | |||
| A1F8 | CALL CalculatePointerOffset | |||
| A1FB | JR Z,ProcessMemoryEntry_Call | Go to ProcessMemoryEntry_Call if the offset meets this pointer. | ||
| A1FD | LD L,(IX+$00) | Read the link word. | ||
| A200 | LD H,(IX+$01) | |||
| A203 | PUSH HL | Copy the link word from HL into IX. | ||
| A204 | POP IX | |||
| ProcessMemoryEntry_Call | A206 | CALL CalculatePointerOffset | Call CalculatePointerOffset to calculate pointer offset. | |
| A209 | POP DE | |||
| A20A | POP HL | |||
| A20B | RET | Return. | ||
| Prev: A1AF | Up: Map | Next: A20C |