Gyruss: Routines

Address	Description
800C	RST $08
800F	RST $10
8012	RST $18
8015	RST $20
8018	RST $28
801B	RST $30
801E	RST $38
8021	NMI
8024	Entry point
80E8	Main loop
8139	Died
8170	Lose life
81AE	Switch player
81ED	Wait for restart
8212	Init stage
830E	Display player message
832A	Stage completed
83D0	Next stage
8429	Display bonus
8450	Display hits
846B	Perfect bonus
84B1	Update frames and upload sprites
84CB	Upload patterns
84DB	Get stage data address
84ED	Clear rows 9 and 14
8501	Interrupt routine
85E6	Process sprites
8654	Deallocate enemy
865A	Handle sprite type $02
867D	Handle sprite type $04 - $0C
86DE	Handle sprite type $14
86E9	Handle sprite types $12 - $13
870C	Handle sprite type $03
873E	Handle sprite types $15 - $17
8790	Handle sprite types $0E - $11
87D5	Create map entry for enemy sprite
8815	Enemy movement: Return enemy to map
8825	Enemy movement: Move enemy towards viewer
8835	Enemy movement: Determine action when out of screen
885F	Enemy movement: Create enemy shot and move towards player.
8878	Enemy movement: Polar Y of enemy < $22
88A7	Enemy movement: Called with random probability.
88BE	Enemy movement: Called with random probability.
88D4	Enemy movement: Counter is >(=) $40
88F3	Enemy movement: Counter is $41
88FE	Enemy movement: Update sprite path
892B	Enemy movement: Upper nybble >= 1
8936	Enemy movement: Move sprite along path and update sprite type
8986	Enemy movement: Set sprite flags to $18 if ...
8994	Enemy movement: Set sprite flags to $04
8999	Enemy movement: Set sprite flags to $40
899E	Handle sprite types $18 - $1C
89EB	Circular enemy movement: Move sprite along path
8A2D	Circular enemy movement: Move enemy towards viewer
8A3C	Circular enemy movement: Set sprite flags to $04
8A41	Return from sprite handler
8A53	When all sprites have been processed
8A76	Create enemy shot if conditions are met
8AC0	Move towards x
8AE6	Reset enemy sprite types after dying
8B12	Draw background patterns for sprite
8BD9	Manage waves
8C07	Manage wave = 4
8C1E	All waves completed
8C30	Manage wave < 4
8C52	Start new wave
8C68	When wave is initiating
8D21	Reset outcoming enemies
8D50	Create "laser fence" or meteor
8DD7	Create meteor
8E2D	Create or display mines
8E89	Init mine variables
8E9D	Create mines
8F0F	Create mine
8F55	Display mines
8FED	Destroy mine
900E	Create shot from mine
90D6	Start screen
9175	Display planet
91A1	Erase planet
91CC	Display planet name and sprites
920D	Clear name table row 7
921F	Decompress and upload patterns
924E	Write single byte
9255	Read B bits into A
9285	Copy planet patterns
9796	Handle collisions
9845	Create double shot pickup sprite
9861	Handle shot (from ship) collision
9924	Shot hit sprite
9934	Shot hit sprite enemy
9978	Add score when enemy destroyed
99A0	Shot hit center enemy
99B1	Shot hit mine
9A08	Shot hit laser fence
9A1C	Remove shot
9A38	Collision of ship with sprite
9A49	Collision of ship with enemy
9A75	Collision of ship with mine
9A86	Polar x distance
9AB3	Add A to HL (RST $08)
9ABB	Unused routine at 9ABB
9AC3	VDP write byte (RST $10)
9AD0	VDP read byte
9ADE	Init sound
9B0D	Play tune
9B59	Increase attenuation for all tune channels
9B87	Stop tune
9B99	Sound player
9BD9	Handle frequency byte when tune index >= 3
9BF8	Relative jump then tune index >= 3
9BFD	Handle duration byte when tune index >= 3
9C1C	Process tune byte
9C39	Handle absolute or relative jump
9C46	Relative jump then check finished
9C4B	Process normal duration and frequency
9C7E	End of processing sound channel
9C92	Handle relative jump
9CA0	Make a relative jump
9CA8	Play sound FX
9CBF	Copy data from sound_fx_data_table to sound fx channel, and change pointer from sound data to sound fx data
9D3D	Sound fx done
9D67	Execute commands for all sound fx channels
9DA7	Sound FX command 3
9DB9	Sound FX command 6
9DC4	Sound FX command 1,4
9DD7	Sound FX command 2
9DE8	Sound FX command 0
9E01	Sound FX command 5,8
9E5C	Sound FX command 7
9E75	Sound FX command 9
9E91	Call play tune, preserve registers
9EA3	Call play sound, preserve registers
A2BB	Send data for all channels to PSG
A2F3	Send data for noise channel to PSG
A303	Send attenuation or noise control bytes to PSG
A314	Send data for tone channel to PSG
A31D	Send attenuation and frequency bytes to PSG
A33B	Initial game loop
A3E1	Explode
A471	Move explosion dots
A699	Display score
A6C8	Display digit
A6D2	Display lives
A6EC	Add points to score
A73C	Control ship
A7D5	Fire double shot
A805	Clear fire pressed
A808	Display ship background patterns
AA7D	Init center enemies
AAA6	Allocate map entry
AAE3	Deallocate map entry
AAF1	Create enemy sprite from map entry
AB38	Sprite coordinates from map
AB53	Deallocate sprite from map
AB72	Display distant enemies at the center of the screen
ABFF	Update name table to display center enemies
AC32	Erase center enemies
AC47	Plot pixel
ACDF	Init sprite data
ACF9	Upload sprite data to VDP
AD49	Allocate sprite (RST $28)
AD8B	Load sprite pattern (RST $30)
AE54	Handle sprite outside visible screen
AE94	Upload sprite patterns
AF6B	Rotate pattern
AFAE	Flip pattern vertically
AFC2	Flip pattern horizontally
AFFF	Display stars
B023	Display star frame
B1C6	Convert polar to screen coordinates
BFAE	Random number generator (RST $20)