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Routines |
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Used by the routine at BuildRoomObjects.
Flags the room that the player is in as visited, in the bitmap of the rooms at RoomsVisitedBitmap. The bit that is set is chosen by changing the instruction at VisitRoom_Set, which is a SET instruction, by changing the byte that follows it.
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Set the bit of this room in RoomsVisitedBitmap.
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| VisitRoom | D219 | LD A,($5C10) | Fetch the room number. | |
| D21C | LD C,A | Stash it in C. | ||
| D21D | RRCA | Divide it by eight. | ||
| D21E | RRCA | |||
| D21F | RRCA | |||
| D220 | AND %00011111 | Keep the offset of the byte. | ||
| D222 | LD L,A | Stash it in L. | ||
| D223 | LD H,$00 | Clear the high byte of the offset. | ||
| D225 | LD A,C | Fetch the room number. | ||
| D226 | RLCA | Move the low three bits to bits 3 to 5. | ||
| D227 | RLCA | |||
| D228 | RLCA | |||
| D229 | AND %00111000 | Keep them. | ||
| D22B | OR %11000110 | Make them into the second byte of an instruction to set that bit. | ||
| D22D | LD ($D235),A | Put the byte into the instruction at VisitRoom_Set. | ||
| D230 | LD BC,$5BE8 | Point BC at RoomsVisitedBitmap. | ||
| D233 | ADD HL,BC | Add the offset of the byte. | ||
| VisitRoom_Set | D234 | SET 0,(HL) | Set the bit of the room. | |
| D236 | RET | Return. | ||
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View the equivalent code in;
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