Routines
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42821: DrawShipMap
Draws the Nostromo ship overview map and handles game-mode selection. Sets border green, fills attributes (32), clears display, then blits the deck plan as tile blocks at fixed screen positions. After drawing, prints the crew names via 31690 (one name per corridor segment) and the four-line menu ("1: Short Game", "2: Long Game", "3: Introduction", "4: Select") from the text table at 43141 (43141).
Input
Key input loop reads port $F7FE:
Key 1 — highlight "Short Game" (selection 0)
Key 2 — highlight "Long Game" (selection 1)
Key 3 — highlight "Introduction" (selection 2)
Key 4 — confirm: dispatch through 3-word table at 43135 (43135)
to the handler for the highlighted mode, then return
"4: Select" is a confirm key, not a fourth game mode. Used by the routine at 36457.
42821 LD A,4 A = 4 (green border)
42823 OUT (254),A set border green
42825 LD A,32 attribute 32 = green ink on black paper
42827 CALL 42515 FillAttributes(32)
42830 CALL 42501 ClearDisplay
42833 CALL 44109 wait for display to stabilise
42836 LD DE,30216
42839 LD HL,16452
42842 LD B,4
42844 PUSH BC
42845 PUSH HL
42846 PUSH DE
42847 CALL 33539
42850 POP DE
42851 LD HL,72
42854 ADD HL,DE
42855 EX DE,HL
42856 POP HL
42857 LD BC,7
42860 ADD HL,BC
42861 POP BC
42862 DJNZ 42844
42864 LD HL,18439
42867 LD B,3
42869 PUSH BC
42870 PUSH HL
42871 PUSH DE
42872 CALL 33539
42875 POP DE
42876 LD HL,72
42879 ADD HL,DE
42880 EX DE,HL
42881 POP HL
42882 LD BC,7
42885 ADD HL,BC
42886 POP BC
42887 DJNZ 42869
42889 LD HL,16579
42892 LD A,1
42894 LD (31257),HL
42897 CALL 31690
42900 LD HL,16587
42903 LD (31257),HL
42906 LD A,2
42908 CALL 31690
42911 LD HL,16593
42914 LD (31257),HL
42917 LD A,3
42919 CALL 31690
42922 LD HL,16601
42925 LD (31257),HL
42928 LD A,4
42930 CALL 31690
42933 LD HL,18565
42936 LD (31257),HL
42939 LD A,5
42941 CALL 31690
42944 LD HL,18573
42947 LD (31257),HL
42950 LD A,6
42952 CALL 31690
42955 LD HL,18581
42958 LD (31257),HL
42961 LD A,7
42963 CALL 31690
42966 LD DE,43141
42969 LD HL,18665
42972 LD (31257),HL
42975 PUSH DE
42976 XOR A
42977 CALL 31693
42980 LD HL,20521
42983 LD (31257),HL
42986 POP DE
42987 PUSH DE
42988 LD A,1
42990 CALL 31693
42993 LD HL,20585
42996 LD (31257),HL
42999 POP DE
43000 PUSH DE
43001 LD A,2
43003 CALL 31693
43006 LD HL,20649
43009 LD (31257),HL
43012 POP DE
43013 PUSH DE
43014 LD A,3
43016 CALL 31693
43019 LD HL,20710
43022 LD (31257),HL
43025 POP DE
43026 LD A,4
43028 CALL 31693
43031 XOR A
43032 LD (33683),A
43035 CALL 43216
43038 LD BC,63486
43041 IN A,(C)
43043 BIT 0,A
43045 JR Z,43061
43047 BIT 1,A
43049 JR Z,43079
43051 BIT 2,A
43053 JR Z,43099
43055 BIT 3,A
43057 JR Z,43119
43059 JR 43038
43061 LD A,(33683)
43064 AND A
43065 JR Z,43038
43067 CALL 43216
43070 XOR A
43071 LD (33683),A
43074 CALL 43216
43077 JR 43038
43079 LD A,(33683)
43082 CP 1
43084 JR Z,43038
43086 CALL 43216
43089 LD A,1
43091 LD (33683),A
43094 CALL 43216
43097 JR 43038
43099 LD A,(33683)
43102 CP 2
43104 JR Z,43038
43106 CALL 43216
43109 LD A,2
43111 LD (33683),A
43114 CALL 43216
43117 JR 43038
43119 LD A,(33683)
43122 ADD A,A
43123 LD HL,43135
43126 LD E,A
43127 LD D,0
43129 ADD HL,DE
43130 LD A,(HL)
43131 INC HL
43132 LD H,(HL)
43133 LD L,A
43134 JP (HL)
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