Commando

Routines

Address	Description
6400	Block of redirects
6456	Trigger sound effect A into free slot at $6433 (unconfirmed)
6469	Clear 7 bytes at $6433
6474	Sound-effect dispatcher, 7 channels (unconfirmed)
6495	Decay sound-effect counters at $6433 (unconfirmed)
64C7	Play beep tone (pitch $6437, duration loop) (unconfirmed)
64E9	Sound param calc -> $6575 (uses $6438) (unconfirmed)
64F9	Sound param calc -> $6575 (uses $6439) (unconfirmed)
6505	Sound param calc -> $6575 (uses $6436) (unconfirmed)
6533	Routine at 6533
6575	Routine at 6575
6593	Scan $6648 table, call $65A5 for active entries
65A5	Routine at 65A5
65F6	Menu key check, set carry/B=$12 (unconfirmed)
6600	Find free slot in $6648 table
6626	Prepare records and variables at $6648
6751	Set up scrolling string
676B	Shift scroll pattern into left border column (unconfirmed)
679D	Advance scroll-message pointer, copy next char's font row to $681E
6825	Update Score
6896	Convert (H,L) screen coords to attribute address
68A6	Zero screen rows using SP as pointer (B rows)
68CA	Routine at 68CA
6950	Compute row attribute address, call $69B4 (unconfirmed)
6975	Fill status-bar columns down, calling $699A per column (unconfirmed)
699A	Routine at 699A
69B4	Compute attribute address for tile (D,E)
69D2	Routine at 69D2
69F3	Top Score and Main Menu??
6A1E	Redefine Keys
6A8C	Routine at 6A8C
6AE1	Prepare status bar screen: fill, set scroll handler
6B14	Wait key unpress, wait key press
6B21	Clear playfield and status screen/attribute areas
6B4C	Zero rectangle at HL (C rows x B bytes)
6B87	Draw menu box border/frame (unconfirmed)
6BAC	Routine at 6BAC
6BBB	Start Game
6C7A	We've got A more grenades
6C80	Update grenades number on the screen
6C96	Print Area number
6C99	Print 2-digit number A
6CAE	Game Over
6E11	Print table row using $6E34 (unconfirmed)
6E34	Print char with derived attribute (unconfirmed)
6E7B	Routine at 6E7B
6ECD	Routine at 6ECD
6F1D	Routine at 6F1D
6F46	Prepare records at $6FE5
6F52	Look up record in $6FE5 table, mask low bits (unconfirmed)
6F79	Find free record in table at $6FD9
6FC7	Prepare records at $6FD9
6FF5	Look up record entry for door/scroll trigger (unconfirmed)
706E	Unpack $66D1 record, scale coordinate x4 (unconfirmed)
70BD	XOR attribute pattern onto screen, explosion effect (unconfirmed)
70EC	Copy 64 bytes $66D1 to $6711
70F8	Find a place in Top Score table
7143	Select joystick type
71A8	Print string HL
71B6	Routine at 71B6
7251	Check menu keys
725D	Print immediate string checking menu keys
7274	Print Score Table
7357	Game main loop / frame handler
73B7	Read Keyboard
7405	Compute code checksum
7511	XOR AF and AF' with every byte in $F900-F9FF
7547	Read input: joystick or keyboard
75A8	Read keyboard in game mode
75BE	Fill screen rectangle with byte
75D2	Print key entered on Redefine Keys
7615	Print immediate string
7621	Print HL as 4-digit hex/BCD (unconfirmed)
7637	Print Char
7767	Char $02: set spacing/mode ($FDB1) from arg, range 0-3
777A	Char $00: clear screen (attributes + bitmap)
7795	Fill all screen attributes with D
77A4	Char $04: advance format counter by 2, store fill char (unconfirmed)
77AC	Char $0A: increment format counter, abort if it reaches $31
77B8	Char $0B: decrement format counter, abort on underflow
77C2	Char $08: decrement format counter, abort if negative
77CB	Char $09: increment format counter, store fill char once $20 reached
77D5	Char $12: set/clear bit 6 of $FDA0 from arg (0/1)
77EB	Char $19: set/clear flag bit 0 ($FDAF) from arg
77FD	Char $10: set field bits 0-2 of $FDA0 from arg
7811	Char $11: set field bits 3-5 of $FDA0 from arg
7828	Char $16: set print position, 2 bounds-checked args
783E	Char $03: repeat character H, L times
784A	Char $13: set fill char ($FD9F) from arg
7852	Char $14: set tab stop, advance format counter
7866	Char $1A: set Font address ($FDA3) from arg word
786E	Char $0C: print padded field using $FDB0 width
787F	Char $18: set width/column counter ($FDB0) from arg
7887	Char $15: set/clear flag bit 1 ($FDAF) from arg
7896	Char $01: reset print format state
78BF	-> $7A10
78C4	Routine at 78C4
78C7	Routine at 78C7
792C	Prepare at new Area
796A	Prepare New Game
79CA	Routine at 79CA
79E1	Init $FF00 buffer entries (32 slots, unconfirmed)
79FB	Calculate checksums??
7A10	Abort: restore stack and interrupts, return to frame loop
7A1E	Set up interrupt vector table at $FB00 (unconfirmed)
7A42	Game main loop / frame handler (redirect)
7A45	Prepare $FE00 table - addresses for every even screen line
7A5C	Delay by BC HALTs
8003	Advance level scroll: walk $FF00 buffer, process sequence record (redirect)
8006	Reset R register (random seed), inside $9193 (redirect)
800C	Multiply HL by 10, add DE (redirect)
800F	Mark map cells for object IX, direction-aware (redirect)
806B	Mark map cells for object IX, direction-aware
80E4	Mark 3 cells in $1600 map, B=1 (entry to $80ED)
80EA	Mark 3 cells in $1600 map, B=C (entry to $80ED)
80FB	Mark cells in $1600 map, B=1 (entry to $8104)
8101	Mark cells in $1600 map, B=C (entry to $8104)
8122	Set/test flag in $1600 map at tile (D,E)
822B	Update vehicle position/state, drift toward player (unconfirmed)
82C1	Set object state flags, call $806B (unconfirmed)
82E1	Advance/rotate object buffer pointer (unconfirmed)
834B	Draw sprite HL
83B8	?? Smth about Jeep
8458	Update Motorbike/Jeep type state (unconfirmed)
8471	?? Smth about Motorbike
8497	Get pseudo-random value / update counter at (HL) (unconfirmed)
8500	?? Smth with Motorbike sprite
854A	Sprite draw dispatch: clip and compute screen address
85AB	?? Smth about Truck
8618	Draw two-part sprite from record at HL (unconfirmed)
867C	Clip sprite rectangle against screen edge (vertical)
86B8	Get Truck sprite to $6300 buffer and shift it if needed
86F5	Routine at 86F5
872F	Fill attribute cells below sprite via SP push (unconfirmed)
876E	Draw walls??
87F1	Routine at 87F1
8914	Draw sprite at ($C006), then fill $1600 map tiles it covers
896D	Get attributes address for the screen line
899E	Compute screen draw address for sprite, save state to buffer
89F3	Set attribute color for B cells at HL
8A03	Routine at 8A03
8A14	Sprite draw dispatch variant, C=4 (unconfirmed)
8A7B	Sprite draw dispatch: clip and compute screen address, C=$08
8AC3	Sprite draw dispatch: clip and compute screen address, C=$0C
8CC9	Clip sprite, then AND/OR-mask blit rows via SP into screen
8E83	Routine at 8E83
8E92	Multiply HL by 10, add DE (unconfirmed)
8EB5	Routine at 8EB5
8EE3	Grenade-crate pickup: draw, on collect award grenades/score/sound
8F17	Draw scenery sprite ($C016) if row on-screen (unconfirmed)
8F26	Draw scenery sprite ($C018) if row on-screen (unconfirmed)
8F35	Draw scenery sprite ($C01A) if row on-screen (unconfirmed)
9014	Routine at 9014
903E	Routine at 903E
904D	Routine at 904D
90A1	Adjust and clip sprite draw, calls $8A14 (unconfirmed)
90AC	Routine at 90AC
9132	Decrement Land space or process next record in the sequence
917C	Walk $FF00 buffer chain (offset $FD88), increment field at +4
9193	Advance level scroll: walk $FF00 buffer, process sequence record
91E3	Routine at 91E3
9204	Process record codes $01-28, not $22
921F	Insert entry into $FF00 buffer chain (unconfirmed)
98D0	Update object IX position, clip to screen, dispatch sprite draw (redirect)
98D3	HL = HL + A (redirect)
98D6	(HL) -> HL (redirect)
98D9	Convert row number to screen line address (redirect)
98DC	DOWN HL (redirect)
98DF	UP HL (redirect)
98EA	HL = HL + A
98F0	(HL) -> HL
98F5	Convert row number to screen line address (via $FE00 table)
9904	DOWN HL - move HL to the next screen line
9913	UP HL
9922	Update object IX position, clip to screen, dispatch sprite draw
9A46	Routine at 9A46
9A6E	Clip sprite edge, dispatch to masked blit
9AE6	Routine at 9AE6
9B05	Masked-OR blit variant, draws sprite row across screen thirds
9B61	Routine at 9B61
9B97	Routine at 9B97
9BCB	Routine at 9BCB
9BF5	Routine at 9BF5
9C23	Compute screen address for sprite row via IX object (unconfirmed)
9C6B	Erase sprite: AND-mask bytes off screen, SP walks data as pointer
9CB1	Erase sprite: AND-mask bytes off screen, SP walks data as pointer
9CED	Erase sprite variant: AND-mask 2 bytes per column via SP
9D1F	Erase sprite: AND-mask bytes off screen, SP walks data as pointer
9D5B	Erase sprite variant: AND-mask row bytes via SP
9D8D	Unmasked-OR blit variant, draws opaque sprite row across screen thirds
9DCC	Unmasked-OR blit variant: 2 bytes per column via SP
9E03	Unmasked-OR blit variant: 2 bytes per column via SP
9E32	Unmasked-OR blit variant: 2 bytes per column via SP
9E69	Unmasked-OR blit variant: alternating columns via SP
9E98	Masked-OR blit variant, draws sprite row across screen thirds
9EDF	Unmasked-OR blit, draws opaque sprite row across screen thirds
9F1D	Off-screen sprite draw: clip, compute address, dispatch blit
9FDE	Routine at 9FDE
9FF5	Routine at 9FF5
DC83	Get random byte?? (redirect)
DC86	Entry E=0, dispatch bullet/collision handler via $DF39 (redirect)
DC89	Initialization and go to game main loop (redirect)
DC8C	Check IX flag and column bound, dispatch (redirect)
DC8F	Check screen brightness threshold, inside $DD8D (redirect)
DC92	Entry E=2, dispatch bullet/collision handler via $DF39 (redirect)
DC95	Routine at DC95
DCAF	Routine at DCAF
DCDF	Initialization and go to game main loop
DD71	Process object records at $5B11
DD89	Process Player's object record
DD8D	Process object IX??
DE91	Game's main loop, Part 1
DEEF	Game's main loop, Part 2
DF16	Get random byte??
DF33	Entry E=2, dispatch bullet/collision handler via $DF39
DF37	Entry E=0, dispatch bullet/collision handler via $DF39
DF67	Routine at DF67
DF6D	Routine at DF6D
DF71	Routine at DF71
DF7B	Bullet collision check, carry set on hit
E01B	Check IX flag and column bound, dispatch (unconfirmed)
E100	Set up player object pointers (IX=$5BDA) (redirect)
E103	Check fire button and joystick input (redirect)
E106	Update boss/enemy state via IX=$5B11 (redirect)
E109	Rebuild active-object list at $F900 from $FF00 buffer (redirect)
E10C	Decrement Enemy delay ($FDDD), spawn enemy by Area ($FDE5) when due (redirect)
E10F	Find free enemy slot in $5B11 table, inside $E01B (redirect)
E112	Common enemy-object init helper (redirect)
E1AC	Common enemy-object init helper (unconfirmed)
E1B5	Routine at E1B5
E1D1	Check pickup/collision near object, award score
E224	Routine at E224
E2DD	Init enemy object (BC=$0806, type $07) (unconfirmed)
E2EA	Decrement Enemy delay ($FDDD), spawn enemy by Area ($FDE5) when due
E4FC	Set up player object pointers (IX=$5BDA)
E5B8	Convert direction code (masked 0-15) to E delta (unconfirmed)
E5DB	Move enemy toward target, clamp to bounds (unconfirmed)
E628	Routine at E628
E648	Move right: check keys/state, advance E and wrap
E679	Move left: check keys/state, advance E and wrap
E6A8	Routine at E6A8
E6DB	Move up/down: check states, adjust row (unconfirmed)
E6FE	Update boss/enemy state via IX=$5B11 (unconfirmed)
E77C	Scan object table for entry near position (unconfirmed)
E794	Routine at E794
E86B	Routine at E86B
E881	Routine at E881
E8A0	Routine at E8A0
E90A	Routine at E90A
E972	Dispatch enemy AI by state (IX+$12)
EB13	Set enemy AI delay/direction by Area number ($FDE5)
EB68	Routine at EB68
EB7B	Routine at EB7B
EB96	Routine at EB96
EBE1	Compute direction bits toward player position (unconfirmed)
EC1B	Check enemy position on-screen, trigger action (unconfirmed)
EC58	Set enemy sub-state (IX+$0C) by threshold, reset delay/target
ECC1	Check fire button and joystick input
ED31	Look up entry in table at $EC81 (unconfirmed)
ED52	Rebuild active-object list at $F900 from $FF00 buffer
EDC8	Routine at EDC8
EDD6	Init object timer field via $EDC8 (unconfirmed)
EE11	Routine at EE11
EE15	Routine at EE15
EF37	Init object record via $EDC8, entry size $0E
EF7C	Init two-part record via $EDC8, check record type (unconfirmed)
EFDD	Check active count vs limit, reset counter/state (unconfirmed)
F076	Routine at F076
F114	Shift object table entry, mark boundary $81 (unconfirmed)
F126	Shift object table entry, mark boundary bytes $81 (unconfirmed)
F14C	Spawn enemy from record, check readiness timer (unconfirmed)
F180	Update enemy state timer, check row threshold (unconfirmed)
F1BB	Check position bounds, set flags (unconfirmed)
F200	Scan object table (IX,$0E stride), compute and store motion vector (redirect)
F203	Set up primary projectile/vehicle table $F73C, process motion (redirect)
F206	Scan explosion-effect table $F856, entry stride $14 (redirect)
F209	Scan player-bullet table at $F82D, init $F8ED marker (redirect)
F20C	Scan player-bullet table at $F82D, entry stride 5 (redirect)
F20F	Select secondary projectile/vehicle table $F7C9 (spawn entry, redirect)
F212	Set up grenade table $F81E, dispatch (redirect)
F21B	Select grenade table $F81E (spawn entry, redirect)
F21E	Clamp/check coordinate H (redirect)
F221	Routine at F221
F237	Clear/init table records (entry size $0E)
F23B	Routine at F23B
F24A	Scan player-bullet table at $F82D, entry stride 5
F26E	Scan player-bullet table at $F82D, init $F8ED marker
F34F	Clamp/check coordinate H (unconfirmed)
F36D	Set up grenade table $F81E, dispatch
F37B	Set up secondary projectile/vehicle table $F7C9, dispatch (unconfirmed)
F381	Set up primary projectile/vehicle table $F73C, process motion (unconfirmed)
F4E3	Select grenade table $F81E (spawn entry)
F4E9	Select secondary projectile/vehicle table $F7C9 (spawn entry)
F4F6	Scan object table (IX,$0E stride), compute and store motion vector
F582	Generate rotated bit-mask pattern A (unconfirmed)
F5A0	Generate rotated bit-mask pattern A, variant (unconfirmed)
F5BF	Routine at F5BF
F5C6	Routine at F5C6
F5CD	Check row/column bounds (used by $F582/$F5A0)
F5DD	Set explosion/effect buffer values from object IX (unconfirmed)
F68A	Decompose position into sub-pixel fields ($F8CF-$F8D1) (unconfirmed)
F6C2	Scan explosion-effect table $F856, find/init free entry (unconfirmed)
F707	Scan explosion-effect table $F856, entry stride $14 (unconfirmed)
FCFC	Game main loop / frame handler (redirect)
FD91	Delay by BC-1 HALTs (redirect)