Something that controls sound (and other things). AHHHHH. Demo mode ??!
E047
cntTillCred
Coin count till credit (when it reaches the magic value the credit goes up)
E048
Credits
Number of credits in BCD 00 to 99
E049
mE049
Current start buttons (active high)
E04A
mE04A
Current inputs (active high)
E04B
mE04B
Last inputs (active high)
E04C
flipValue
Current flip bits value
E04D
mE04D
Incremented when buggy-held-in-air is done
E04E
isrCNT_1
Bumped up with every IRQ
E04F
isrCNT_16
Bumped up every 16 IRQs
E050
isrCount3
Bumped down every IRQ
E051
isrCount4
Bumped down every IRQ
E052
mE052
E053
coinStart
Holds the current value (active high) of D000. Filled in the ISR.
E054
mE054
E05F
mE05F
E068
mE068
E094
mE094
E096
mE096
E098
mE098
E0D6
mE0D6
E0D8
mE0D8
E0DA
mE0DA
E0DC
mE0DC
E0E4
mE0E4
E0E6
mE0E6
E0E7
mE0E7
Counts command buffers when running them
E0E8
mE0E8
E0E9
splashLSB
Splash screen data cursor LSB
E0EA
splashMSB
Splash screen data cursor MSB
E0EB
splshObjLSB
Pointer to screen for splash object LSB
E0EC
splshObjMSB
Pointer to screen for splash object MSB
E0ED
servCrdCnt
Every 16 ISRs the service-credit is pressed add one credit
E0EE
mE0EE
E0EF
mE0EF
E0F1
mE0F1
E0F3
mystCnt
Bumped every ISR if *unused* bit 3 of DS2 is flipped
E0F4
mE0F4
E0F6
mE0F6
E0F7
mE0F7
E0F9
champColors
If zero then use "beginner" colors. Else use "champ" colors.
E172
mE172
E1A2
mE1A2
E1A6
mE1A6
E1AA
mE1AA
E1AE
mE1AE
E1C0
mE1C0
E1C1
mE1C1
E1C2
mE1C2
E1C3
mE1C3
E1C4
mE1C4
E1C5
mE1C5
E302
mE302
E304
mE304
E305
mE305
E306
mE306
E308
mE308
E309
mE309
E30A
mE30A
E30D
mE30D
E30E
mE30E
E314
mE314
E31A
mE31A
E31C
mE31C
E320
mE320
E322
mE322
E323
mE323
E327
mE327
E32A
mE32A
E32D
mE32D
E32F
mE32F
E372
mE372
E100-E1BF Sprites (48) info copied to hardware by ISR
E100->C840 (0x40 bytes) ?? Enemy rocks and ships
E140->C820 (0x20 bytes)
E160->C8C0 (0x40 bytes)
E1A0->C8A0 (0x20 bytes) ?? Buggy, wheels, forward shot
E1C0-E1CE also used by ISR ??
E1CF
comListHead
the LSB of the first entry in the wrap-around command list at E600..E6FF
E1D0
comListTail
the LSB of the next-available slot in the command list.
E1D3
mE1D3
E1D4
mE1D4
E1D5
mE1D5
E1D6
mE1D6
E1D7
mE1D7
E1D8
mE1D8
E1D9
mE1D9
E1DA
mE1DA
E1DC
mE1DC
E1DD
SndQFront
Next to pull from the sound queue (MSB is #$E0)
E1DE
SndQBack
Next to store in sound queue (MSB is #$E0)
E1DF
mE1DF
E1E0
mE1E0
E1E1
mE1E1
E1E2
mE1E2
E300
buggyHandler
the current handler routine for the moon buggy
E301
buggyObject
LSB of sprite object for buggy
E303
buggyX
X coordinate of the moon buggy
E307
buggyY
Y coordinate of the moon buggy +0A ... count-down jump timer in demo
E310
??Object1??
E330
airShot0
E340
airShot1
E350
airShot2
E360
airShot3
E370
??object7??
E380
??object8??
E390
??object9??
E3A0
??objectA??
E3B0
??objectB??
E3C0
??objectC??
E3D0
??objectD??
E3E0
??objectE??
E3F0
??objectF??
E400
??object10??
E410
??object11??
E420
??object12??
E430
??object13??
E440
??object14??
E450
??object15??
E460
??object16??
E470
??object17??
E480
??object18??
E490
??object19??
E4A0
??object1A??
E4B0
??object1B??
E4C0
??object1C??
E4D0
??object1D??
E4E0
??object1E??
E4F0
??object1F??
E500 - E517 is current player
E518
mE518
E52F
mE52F
is other player (swapped at 60A)
E500
curScore
Score for current player 3-byte (6-digit)
E501
curScore1
Score for current player 3-byte (6-digit)
E502
curScore2
Score for current player 3-byte (6-digit)
E503
mE503
E504
mE504
E505
mE505
E506
mE506
E507
mE507
E508
mE508
E509
mE509
E50A
mE50A
E50B
mE50B
E50C
mE50C
E50D
mE50D
E50E
curPoint
Current passed point
E50F
??E50F??
cleared when course number is incremented
E510
courseNum
Course number (0=beginner, 1.. champion)
E511
mE511
E512
mE512
E513
mE513
E514
mE514
E515
mE515
E516
mE516
E517
mE517
E518
othScore
Score for "other" player 3-byte (6-digit)
E519
othScore1
Score for "other" player 3-byte (6-digit)
E51A
othScore2
Score for "other" player 3-byte (6-digit)
E51B
mE51B
E51C
mE51C
E51D
mE51D
E51E
mE51E
E51F
mE51F
E520
mE520
E521
mE521
E522
mE522
E523
mE523
E524
mE524
E525
mE525
E526
mE526
E527
mE527
E528
mE528
E529
mE529
E52A
mE52A
E52B
mE52B
E52C
mE52C
E52D
mE52D
E52E
mE52E
E52F
mE52F
E700
mE700
E701
menuRow
The current main menu row number (3-8)
E702
keyValue
During up/down in menu ... the input value that triggered delta
E703
stopRow
During up/down in menu ... stop value for delta (3 or 8)
E704
rowDelta
During up/down in menu ... row delta (1 or -1)
E705
sndNumber
Current row number in sound menu
E706
sndLastRow
Last row in sound menu (14)
E707
sndFirstRow
First row in sound menu (1)
E708
sndValue
During snd left/right ... the input value that triggered delta
E709
sndStop
During snd left/right ... the stop value for delta (1 or 14)
E80A
sndDelta
During snd left/right ... row delta (1 or -1)
E70B
sndTable
Table of offsets to sounds in sound menu
E70C
UN_E70C
Unused
E70D
isrCntM
MSB of 4-digit BCD ISR counter
E70E
isrCntL
LSB of 4-digit BCD ISR counter
E70F
isrCVal
Current value of upper 2 bits of ISR (changes every 1.1 secs)
E710
lrButtons
L/R buttons toggle bits for debouncing
E711
startButtons
Start buttons toggle bits for debouncing
E712
colorScreen
Number of color-screen in the color menu
Stack builds down from end of RAM (E800)
E000-E6FF is cleared at startup. Stack is probably reserved from E700-E800. That's huge.
I captured RAM access for a typical run through MAME and found the stack builds down
to E7E0. It has a long way to go still!
E000 Sound effects queue buffer
These are read once at power-up
>011E bit 0 clear
>01D4 00
>0567 80 or 90
>0609 toggle bit 3 (swap players)
>0C7F bit 0 set
>27C0 bit 0 cleared
0 1=run game objects in ISR in game mode, 0=skip @00F2
1 1=skip pause cheat, 0=check pause cheat in ISR (00AB) and (00DD) >0104
2 @00E7
3 0=player 1's game, 1=player 2's game @015D @061C @0D41
4 0=single player, 1 = multi ?? @0136 @0153 @0CF6
5
6
7 1=??Demo mode?? 1=don't register score @062C, @00D9, @047A, @062C @0D76
There are 32 objects that are processed with each ISR interrupt. All 32 are processed
every ISR. Each object is a 16 byte structure. The first byte selects the code to run
for the object when the ISR fires. This value is an offset in a jump table with 1 being
the first entry. A value of 0 means do nothing (the object is inactive or available).
Unlike the "text" objects processed in the main-loop, these objects are fixed. Object 0
is always the moon-buggy. Object 2 is always the player's forward shot. Objects 3..6
are always the four player-air-shots.
E300 ISRobjects Start of ISR game object structures
E300 ... E4FF 32 object slots (16 bytes each)
00 Command number to execute (0 means none)
01 LSB of object pointer E1xx (4 bytes each)
02
03 X coordinate
05
06
07 Y coordinate
08
09
0A count-down timer (number of movements for forward shot)
0B
0C
0D
0E
0F
E600..E6FF contains a list of ??text??game commands to execute.
E1CF contains the LSB of the first command.
E1D0 contains the LSB of the next-available command.
The loop at 0283 starts with the pointer E1CF and runs commands until
it reaches E1D0 (the list wraps back around as the LSB wraps).
The code at 02C2 adds new commands to the list. There is no checking to
see if the list overflows.
The code at 029C advances the list's "head" over an inactive command. All
commands eventually become inactive thus they eventually all get removed
from the front of the list.
The format of these commands:
00 Command number (00=none)
01 ?? ISR value for next execution (@0325) --
02 Text script LSB
03 Text script MSB
