Commando: Memory map

Page	Byte	Address	Description
91	0	5B00	Data block at 5B00
91	17	5B11	Object records, 20 bytes wide
91	217	5BD9	Data block at 5BD9
100	0	6400	Block of redirects
100	51	6433	Sound channel counters (7 slots), decay rates follow at $6441
100	86	6456	Trigger sound effect A (copy its parameter into slot A)
100	105	6469	Clear 7 bytes at $6433
100	116	6474	Sound-effect dispatcher, 7 channels
100	149	6495	Decay sound-effect counters at $6433
100	171	64AB	Play a two-stage sound stepped by counter $6434
100	199	64C7	Play beep tone (pitch $6437, duration loop)
100	233	64E9	Play a beep with pitch derived from $6438
100	249	64F9	Play a beep with pitch derived from $6439
101	5	6505	Play a beep with pitch derived from $6436
101	15	650F	Play a banded sound stepped by counter $6435
101	51	6533	Play a sound-effect tone (pitch from $6433)
101	80	6550	Unreferenced duplicate of the beeper loop at 6575
101	117	6575	Sound a square-wave beep
101	147	6593	Scan $6648 table, call $65A5 for active entries
101	165	65A5	Tick an object's timer; when it runs out, rebuild its work record
101	246	65F6	Menu key check, set carry/B=$12 (unconfirmed)
102	0	6600	Find free slot in $6648 table
102	38	6626	Prepare records and variables at $6648
102	72	6648	Effect slot table, 5 records of 5 bytes
102	209	66D1	Packed tile records, unpacked into the $6711 buffer by 706E
103	81	6751	Set up scrolling string
103	107	676B	Scroll the message banner one pixel left
103	157	679D	Advance scroll-message pointer, copy next char's font row to $681E
103	206	67CE	Scrolling title message, $1F ends it
104	27	681B	Scroll state: message pointer, step timer and the font-row buffer
104	37	6825	Update Score
104	150	6896	Convert (H,L) screen coords to screen address
104	166	68A6	Zero screen rows using SP as pointer (B rows)
104	202	68CA	Screen wipe/reveal transition, paced by $FDBC
105	80	6950	Compute row attribute address, call $69B4
105	117	6975	Fill status-bar columns down, calling $699A per column
105	154	699A	Compute attribute address for fixed tile row
105	180	69B4	Compute attribute address for tile (D,E)
105	210	69D2	Set up attract/menu mode, then fall into the main menu
105	243	69F3	Main menu: show score table, dispatch menu key
106	30	6A1E	Redefine Keys
106	140	6A8C	Check if a key code is already assigned (Redefine Keys)
106	163	6AA3	Messages to use in Redefine Keys
106	225	6AE1	Prepare status bar screen: fill, set scroll handler
107	20	6B14	Wait key unpress, wait key press
107	33	6B21	Clear playfield and status screen/attribute areas
107	76	6B4C	Zero rectangle at HL (C rows x B bytes)
107	103	6B67	Letters to select from entering Top Score
107	135	6B87	Draw menu box border/frame
107	172	6BAC	Scroll the Area in, up to $5C steps or until it arrives
107	187	6BBB	Start Game
108	122	6C7A	We've got A more grenades
108	128	6C80	Update grenades number on the screen
108	150	6C96	Print Area number
108	153	6C99	Print 2-digit number A
108	174	6CAE	Game Over
110	8	6E08	Name entry finished: wait for the key to lift, clear the screen and return to the menu
110	17	6E11	Print table row using $6E34
110	52	6E34	Print char with derived attribute
110	123	6E7B	Update the Top Score name-entry selectors
110	205	6ECD	Draw/move the Top Score name-entry cursor
111	29	6F1D	Name-entry outro: draw selectors, animate, clear
111	70	6F46	Prepare records at $6FE5
111	82	6F52	Look up record in $6FE5 table, mask low bits
111	121	6F79	Find free record in table at $6FD9
111	199	6FC7	Prepare records at $6FD9
111	217	6FD9	Name-entry selector records, 4 of 3 bytes
111	229	6FE5	Name-entry letter records, 8 of 2 bytes
111	245	6FF5	Advance strip position, scroll the $6711 tile buffer
112	110	706E	Unpack $66D1 record, scale coordinate x4
112	154	709A	Feature codes for the name-entry strip, indexed by column
112	189	70BD	XOR attribute pattern onto screen, explosion effect
112	236	70EC	Copy 64 bytes $66D1 to $6711
112	248	70F8	Find a place in Top Score table
113	67	7143	Select joystick type
113	168	71A8	Print string HL
113	178	71B2	Screen attributes, 4 bytes
113	182	71B6	Print credits screen, scroll text into $5923 area
114	81	7251	Check menu keys
114	93	725D	Print immediate string checking menu keys
114	116	7274	Print Score Table
114	178	72B2	Score table
115	87	7357	Game main loop / frame handler
115	183	73B7	Read Keyboard
116	5	7405	Compute code checksum
117	17	7511	XOR AF and AF' with every byte in $F900-F9FF
117	71	7547	Read input: joystick or keyboard
117	99	7563	Read the Kempston joystick from port $1F
117	105	7569	Read Interface II: scan its port and mask list
117	122	757A	Read the Fuller joystick from port $7F
117	135	7587	Read the cursor keys: scan their port and mask list
117	152	7598	Keyboard ports and bit masks - keys to read in game mode
117	168	75A8	Read keyboard in game mode
117	190	75BE	Fill screen rectangle with byte
117	210	75D2	Print key entered on Redefine Keys
118	21	7615	Print immediate string
118	33	7621	Print HL as 4-digit hex/BCD
118	55	7637	Print Char
119	95	775F	Spacing-mode handler addresses, indexed by the mode in $FDB1
119	103	7767	Char $02: set spacing/mode ($FDB1) from arg, range 0-3
119	122	777A	Char $00: clear screen (attributes + bitmap)
119	149	7795	Fill all screen attributes with D
119	164	77A4	Char $04: advance format counter by 2, store fill char
119	168	77A8	Char $0D: store the fill char at HL
119	172	77AC	Char $0A: increment format counter, abort if it reaches $31
119	184	77B8	Char $0B: decrement format counter, abort on underflow
119	194	77C2	Char $08: decrement format counter, abort if negative
119	203	77CB	Char $09: increment format counter, store fill char once $20 reached
119	213	77D5	Char $12: set/clear bit 6 of $FDA0 from arg (0/1)
119	235	77EB	Char $19: set/clear flag bit 0 ($FDAF) from arg
119	253	77FD	Char $10: set field bits 0-2 of $FDA0 from arg
120	17	7811	Char $11: set field bits 3-5 of $FDA0 from arg
120	40	7828	Char $16: set print position, 2 bounds-checked args
120	62	783E	Char $03: repeat character H, L times
120	74	784A	Char $13: set fill char ($FD9F) from arg
120	82	7852	Char $14: set tab stop, advance format counter
120	102	7866	Char $1A: set Font address ($FDA3) from arg word
120	110	786E	Char $0C: print padded field using $FDB0 width
120	127	787F	Char $18: set width/column counter ($FDB0) from arg
120	135	7887	Char $15: set/clear flag bit 1 ($FDAF) from arg
120	150	7896	Char $01: reset print format state
120	191	78BF	-> $7A10
120	194	78C2	Print opcode exit: drop two saved register pairs
120	196	78C4	Print opcode exit: drop the saved state and return
120	199	78C7	Print opcode exit: drop the saved registers and return
120	204	78CC	Table to map special char $00..$1F to types $00..$02
120	236	78EC	Address map to print chars $00..$1F - 32 addresses
121	44	792C	Prepare at new Area
121	106	796A	Prepare New Game
121	202	79CA	System init: interrupt table, screen-line table, checksums
121	225	79E1	Init $FF00 buffer entries (32 slots, unconfirmed)
121	251	79FB	Build the $FA00 column-checksum table
122	16	7A10	Abort: restore stack and interrupts, return to frame loop
122	30	7A1E	Set up interrupt vector table at $FB00
122	66	7A42	Game main loop / frame handler (redirect)
122	69	7A45	Prepare $FE00 table - addresses for every even screen line
122	92	7A5C	Delay by BC HALTs
122	99	7A63	Data block at 7A63
126	160	7EA0	Font
128	0	8000	Entry point: jump to the redirect block, and the base of the checksummed region
128	3	8003	Advance level scroll: walk $FF00 buffer, process sequence record (redirect)
128	6	8006	Clear the draw-mode flag (R bit 7), enter $9193 (redirect)
128	9	8009	Redirect: jump to the level-1 sequence table
128	12	800C	Multiply HL by 10, add DE (redirect)
128	15	800F	Mark map cells for object IX, direction-aware (redirect)
128	18	8012	Scenery handler addresses, indexed by the level record code minus one (see 9193); the level data at $9236 names what each code places
128	98	8062	End of the enemy run with rocket launchers
128	107	806B	Mark map cells for object IX, direction-aware
128	228	80E4	Mark 3 cells in $1600 map, B=1 (entry to $80ED)
128	234	80EA	Mark 3 cells in $1600 map, B=C (entry to $80ED)
128	251	80FB	Mark cells in $1600 map, B=1 (entry to $8104)
129	1	8101	Mark cells in $1600 map, B=C (entry to $8104)
129	34	8122	Set/test flag in $1600 map at tile (D,E)
129	88	8158	Turn the alarm on: sound it, then draw
129	100	8164	Draw a trench, right-hand side
129	105	8169	Draw a trench, left-hand side
129	120	8178	Draw a trench, middle
129	135	8187	Spawn point marker: the Area replays from here
129	143	818F	Draw the fortress gates
130	43	822B	Move and draw a prisoner of war
130	180	82B4	Data 13 bytes to copy at $FDCF
130	193	82C1	Set object state flags, call $806B
130	225	82E1	Advance/rotate object buffer pointer
131	1	8301	Draw a small hut
131	47	832F	Draw the cave body
131	63	833F	Draw a cave top edge
131	68	8344	Draw a cave bottom edge
131	75	834B	Draw sprite HL
131	164	83A4	Spawn the Jeep: seed its record at $FDCB
131	184	83B8	Update and draw the Jeep sprite
132	88	8458	Set the type of the next motorbike
132	113	8471	Run both motorbikes: prepare, animate and draw
132	151	8497	Animate and draw a motorbike
133	0	8500	Prepare the motorbike sprite: reload or shift one pixel
133	74	854A	Sprite draw dispatch: clip and compute screen address
133	148	8594	Draw the truck
133	171	85AB	Update and draw the Truck(s)
134	24	8618	Draw two-part sprite from record at HL
134	124	867C	Clip sprite rectangle against screen edge (vertical)
134	184	86B8	Get Truck sprite to $6300 buffer and shift it if needed
134	245	86F5	Draw a bunker
135	47	872F	Draw the road surface on a bridge
135	110	876E	Draw a wall
135	241	87F1	Draw a bridge section
136	229	88E5	Two-tone structure graphic, drawn by 87F1
136	253	88FD	Draw a barracks
137	20	8914	Draw a tunnel
137	109	896D	Get attributes address for the screen line
137	127	897F	Draw a log crossing
137	158	899E	Compute screen draw address for sprite, save state to buffer
137	243	89F3	Set attribute color for B cells at HL
138	3	8A03	Set attribute INK=1 for B cells at HL (variant of $89F3)
138	20	8A14	Sprite draw dispatch variant, C=4
138	123	8A7B	Sprite draw dispatch: clip and compute screen address, C=$08
138	195	8AC3	Sprite draw dispatch: clip and compute screen address, C=$0C
139	75	8B4B	Sprite draw dispatch: clip and compute screen address, C=$10
139	231	8BE7	Sprite draw dispatch: clip and compute screen address, C=$14
140	201	8CC9	Clip sprite, then AND/OR-mask blit rows via SP into screen
141	88	8D58	Draw water strip 1
141	93	8D5D	Draw water strip 2
141	141	8D8D	Draw the structure's extra segment when the sub-row index calls for it
141	158	8D9E	Draw one segment of the structure and colour the row beneath it
141	204	8DCC	Draw water
142	53	8E35	Fill a block of screen rows with the DE and BC patterns through the stack
142	81	8E51	Fold the screen address into the attribute area and colour the cells
142	116	8E74	Draw a left mortar
142	131	8E83	Draw a right mortar
142	146	8E92	Shift-add multiply: 8 bits of H, adding DE per set bit
142	181	8EB5	A single grenade pickup
142	204	8ECC	A triple grenade pickup
142	227	8EE3	A quintuple grenade pickup
143	23	8F17	Draw sandbags, left-hand side
143	38	8F26	Draw sandbags, middle
143	53	8F35	Draw sandbags, right-hand side
143	66	8F42	Draw the road bottom edging
143	73	8F49	Draw the road top edging
144	5	9005	Draw a road marking
144	20	9014	Draw a tree
144	62	903E	Draw a boulder
144	77	904D	Draw a cliff edge
144	161	90A1	Adjust and clip sprite draw, calls $8A14
144	172	90AC	Draw a mirrored cliff
145	36	9124	Cliff attribute palette, indexed by column
145	50	9132	Decrement Land space or process next record in the sequence
145	118	9176	Level record: abort the sequence through the redirect block
145	124	917C	Walk $FF00 buffer chain (offset $FD88), increment field at +4
145	147	9193	Advance level scroll: walk $FF00 buffer, process sequence record
145	227	91E3	Link record entry into the $FF00 buffer chain, continue
146	4	9204	Process record codes $01-28, not $22
146	31	921F	Insert entry into $FF00 buffer chain
146	54	9236	Level 1
147	64	9340	Level 2
148	24	9418	Level 3
148	232	94E8	Level 4
149	152	9598	Level 5
150	148	9694	Level 6
151	142	978E	Level 7
152	24	9818	Level 8
152	208	98D0	Update object IX position, clip to screen, dispatch sprite draw (redirect)
152	211	98D3	HL = HL + A (redirect)
152	214	98D6	(HL) -> HL (redirect)
152	217	98D9	Convert row number to screen line address (redirect)
152	220	98DC	DOWN HL (redirect)
152	223	98DF	UP HL (redirect)
152	226	98E2	Offsets in $A000 sprites block, lo byte
152	234	98EA	HL = HL + A
152	240	98F0	(HL) -> HL
152	245	98F5	Convert row number to screen line address (via $FE00 table)
153	4	9904	DOWN HL - move HL to the next screen line
153	19	9913	UP HL
153	34	9922	Update object IX position, clip to screen, dispatch sprite draw
154	70	9A46	Blit continuation: draw remaining sprite width
154	110	9A6E	Clip sprite edge, dispatch to masked blit
154	230	9AE6	Clip wide sprite edge, dispatch to masked blit
155	5	9B05	Masked blit: four-column band, serpentine
155	97	9B61	Set up sprite erase, dispatch to erase-blit variant
155	151	9B97	Second pass: redraw sprite via unmasked-OR blit
155	203	9BCB	Set up sprite erase (positive path), dispatch to erase-blit
155	245	9BF5	Second pass (positive path): redraw via unmasked-OR blit
156	35	9C23	Compute screen address for sprite row via IX object
156	107	9C6B	Erase sprite: AND-mask bytes off screen, SP walks data as pointer
156	177	9CB1	Erase sprite: AND-mask bytes off screen, SP walks data as pointer
156	237	9CED	Erase sprite variant: AND-mask 2 bytes per column via SP
157	31	9D1F	Erase sprite: AND-mask bytes off screen, SP walks data as pointer
157	91	9D5B	Erase sprite variant: AND-mask row bytes via SP
157	141	9D8D	Unmasked-OR blit variant, draws opaque sprite row across screen thirds
157	204	9DCC	Unmasked-OR blit variant: 2 bytes per column via SP
158	3	9E03	Unmasked-OR blit variant: one column, 2 lines per pass
158	50	9E32	Unmasked-OR blit variant: two columns, serpentine
158	105	9E69	Unmasked-OR blit variant: alternating columns via SP
158	152	9E98	Masked-OR blit variant, draws sprite row across screen thirds
158	223	9EDF	Unmasked-OR blit, draws opaque sprite row across screen thirds
159	29	9F1D	Off-screen sprite draw: clip, compute address, dispatch blit
159	222	9FDE	Finish sprite off-screen: commit pending fields
159	245	9FF5	Blit finish: commit Y position, restore SP
160	0	A000	Sprites of Player and troopers; width 3 height 21
192	0	C000	Sprite addresses
192	80	C050	Sprite ???; width 2
192	160	C0A0	Sprite ???; width 2
192	240	C0F0	Sprite Cliff bottom left; width 6
193	224	C1E0	Sprite Cliff top left; width 6
194	112	C270	Sprite ???; width 2
194	196	C2C4	Sprite ???; width 2
195	24	C318	Sprite Cliff edge left; width 2
195	80	C350	Sprite Cliff edge right; width 2
195	136	C388	Sprite Cliff bottom right; width 6
196	120	C478	Sprite Cliff top right; width 6
197	8	C508	Sprite Cave, exit to the right; width 6
197	248	C5F8	Sprite Cave, exit to the left; width 6
198	232	C6E8	Sprite Cave top edge; width 6
199	24	C718	Sprite Cave bottom edge; width 6
199	72	C748	Sprite Truck; width 8
200	72	C848	Sprite ???; width 2?
200	144	C890	Sprite Hut; width 6
201	128	C980	Sprite Jeep; width 4
202	0	CA00	Sprite Motorbike; width 6
202	144	CA90	Sprite ???; width ?
202	192	CAC0	Sprite ???; width ?
203	32	CB20	Sprite ???; width ?
203	80	CB50	Sprite Wall; width 4
204	24	CC18	???
207	56	CF38	Sprite ???
207	120	CF78	Sprite for the scenery drawn by 8ECC
207	252	CFFC	Sprite for the grenade crate (8EE3)
208	128	D080	Sprite for the scenery drawn by 8E74
208	192	D0C0	Sprite for the scenery drawn by 8E83
209	0	D100	Sprite for the tall scenery drawn by 897F
209	160	D1A0	Sprite for the scenery drawn by 903E
210	36	D224	Sprite for the scenery drawn by 8F17
210	108	D26C	Sprite for the scenery drawn by 8F26
210	216	D2D8	Sprite for the scenery drawn by 8F35
211	32	D320	Lower half of the two-part scenery object (9014)
211	128	D380	Sprite for the scenery drawn by 88FD
214	20	D614	Upper half of the two-part scenery object (9014)
214	68	D644	Truck sprite variant used by 86F5
217	68	D944	Truck sprite variant used by 86F5
220	131	DC83	Get random byte (redirect)
220	134	DC86	Entry E=0, dispatch bullet/collision handler via $DF39 (redirect)
220	137	DC89	Initialization and go to game main loop (redirect)
220	140	DC8C	Check IX flag and column bound, dispatch (redirect)
220	143	DC8F	Check screen brightness threshold, inside $DD8D (redirect)
220	146	DC92	Entry E=2, dispatch bullet/collision handler via $DF39 (redirect)
220	149	DC95	Scroll level and shift all objects down
220	175	DCAF	Periodically spawn a new enemy from the edge
220	223	DCDF	Initialization and go to game main loop
221	63	DD3F	Sprite frame table, indexed by object state and direction
221	113	DD71	Process object records at $5B11
221	137	DD89	Process Player's object record
221	141	DD8D	Draw object IX: select sprite frame, clip, blit
222	145	DE91	Game's main loop, Part 1
222	221	DEDD	Wait for the pause key to be released, pressed and released again
222	239	DEEF	Game's main loop, Part 2
223	22	DF16	Random number generator: step the 32-bit register at $FD9B
223	51	DF33	Entry E=2, dispatch bullet/collision handler via $DF39
223	55	DF37	Entry E=0, dispatch bullet/collision handler via $DF39
223	103	DF67	Collision scan exit: restore SP and report no hit
223	109	DF6D	Collision scan: drop this entry and take the next
223	113	DF71	Collision hit on the player: flag them dead and mark the object
223	123	DF7B	Bullet collision check, carry set on hit
224	27	E01B	Check IX flag and column bound, dispatch
224	191	E0BF	Map-scan tails: step to the next row, or set the Area flag and return
225	0	E100	Set up player object pointers (IX=$5BDA) (redirect)
225	3	E103	Check fire button and joystick input (redirect)
225	6	E106	Check player shots against every enemy in $5B11 (redirect)
225	9	E109	Rebuild active-object list at $F900 from $FF00 buffer (redirect)
225	12	E10C	Decrement Enemy delay ($FDDD), spawn enemy by Area ($FDE5) when due (redirect)
225	15	E10F	Find free enemy slot in $5B11 table, inside $E01B (redirect)
225	18	E112	Draw a small random offset (-1, 0 or +1) (redirect)
225	21	E115	Data block at E115
225	136	E188	Enemy AI state handler addresses, indexed by the state byte (+$12) from E972
225	168	E1A8	Tail of the AI table block: drop the return address and abort
225	172	E1AC	Draw a small random offset (-1, 0 or +1)
225	181	E1B5	Service the two bomb/explosion slots
225	209	E1D1	Check pickup/collision near object, award score
226	36	E224	Jeep hit check, kill/score, spawn next enemy (unconfirmed)
226	221	E2DD	Init enemy object (BC=$0806, type $07)
226	234	E2EA	Decrement Enemy delay ($FDDD), spawn enemy by Area ($FDE5) when due
228	242	E4F2	Direction codes read by EBE1 as $E4F1 + the direction bits; index 0 is never used, so the base byte is the RET above
228	252	E4FC	Set up player object pointers (IX=$5BDA)
229	184	E5B8	Convert direction code (masked 0-15) to E delta
229	219	E5DB	Move enemy toward target, clamp to bounds
230	40	E628	Dispatch by direction, clear draw-active if off-screen
230	72	E648	Move right: check keys/state, advance E and wrap
230	121	E679	Move left: check keys/state, advance E and wrap
230	168	E6A8	Move enemy up one row if states/flags allow
230	219	E6DB	Move up/down: check states, adjust row
230	254	E6FE	Check player shots against every enemy in $5B11
231	124	E77C	Scan object table for entry near position
231	148	E794	Enemy melee/contact check vs player, kill if close
232	107	E86B	Enemy AI pause: reload short action timer
232	129	E881	Enemy AI: re-aim at player, random fire
232	160	E8A0	Enemy wandering AI: timed re-aim, random fire and step
233	10	E90A	Enemy AI: check row range, transition to attack state
233	114	E972	Dispatch enemy AI by state (IX+$12)
233	199	E9C7	Enemy AI state: clear the turn flag, reset the state and wander
233	210	E9D2	Enemy AI state: clear the turn flag, wait $30 frames
233	221	E9DD	Enemy AI state: pick a heading by row band, or fire
234	142	EA8E	Enemy AI state: count the turn timer down, then steer
235	19	EB13	Set enemy AI delay/direction by Area number ($FDE5)
235	104	EB68	Enter enemy AI state $01 with heading $08
235	123	EB7B	Enemy patrol AI: walk N steps then reverse
235	150	EB96	Enemy AI: wander or chase player by aggressive flag
235	225	EBE1	Compute direction bits toward player position
236	27	EC1B	Check enemy position on-screen, trigger action
236	88	EC58	Set enemy sub-state (IX+$0C) by threshold, reset delay/target
236	129	EC81	Per-direction shot offsets and sizes, read by ED31
236	193	ECC1	Check fire button and joystick input
237	49	ED31	Look up entry in table at $EC81
237	82	ED52	Rebuild active-object list at $F900 from $FF00 buffer
237	200	EDC8	Populate object record fields from A/B and a source byte
237	214	EDD6	Init object timer field via $EDC8
238	17	EE11	Read the scroll value from the record and store it
238	21	EE15	Seed the scroll position from the record when it is unset
238	36	EE24	Advance the record fields and stamp the object onto the map
239	55	EF37	Init object record via $EDC8, entry size $0E