Routines
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C6CC: Mark the player's room as seen
Used by the routine at ENTER_ROOM.
Sets the room's bit in ROOMS_SEEN: byte room/8, bit 7 minus room mod 8, so room 0 is bit 7 of the first byte. The 31 bytes have room for 248 rooms. PERCENTAGE counts them.
Input
IX The player's legs
MARK_ROOM_SEEN C6CC LD A,(IX+$08) E = the byte: the room number divided by 8
C6CF RRA
C6D0 RRA
C6D1 RRA
C6D2 AND $1F
C6D4 LD E,A
C6D5 LD A,(IX+$08) A = the bit: a carry rotated in from the top, as far as the room number's low three bits say
C6D8 AND $07
C6DA LD B,A
C6DB INC B
C6DC XOR A
C6DD SCF
MARK_ROOM_SEEN_0 C6DE RRA
C6DF DJNZ MARK_ROOM_SEEN_0
C6E1 LD D,$00 Set it in the map
C6E3 LD HL,ROOMS_SEEN
C6E6 ADD HL,DE
C6E7 OR (HL)
C6E8 LD (HL),A
C6E9 RET
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