Moon Patrol Sound RAM Use

0080	seqV0	Sequence voice 0 on AY0 (FF for off, count down to 0=process)
0081	seqV0	Sequence voice 1 on AY0 (FF for off, count down to 0=process)
0082	seqV0	Sequence voice 2 on AY1 (FF for off, count down to 0=process)
0083	seqV0	Sequence voice 3
0084:0085	seqPtr1	Sequence pointer voice 0
0086:0087	seqPtr2	Sequence pointer voice 1
0088:0089	seqPtr3	Sequence pointer voice 2
008A:008B	seqPtr4	Sequence pointer voice 3
008C	seq1CmdType	Type of command being processed on sequencer 1
008D	seq2CmdType	Type of command being processed on sequencer 2
008E	seq3CmdType	Type of command being processed on sequencer 3
008F	seq4CmdType	Type of command being processed on sequencer 4
0090	cmdCnt	Count of commands of the current type (if not 0). Resets to type 0 when done.
0091	m0091
0092	m0092
0093	m0093

These eight bytes (2 per sequencer) are parameters for any complex commands. The actual content depends on which complex command is being played.

0094:0097	modeParams1	Mode parameters (number 1)
0098:009B	modeParams2	Mode parameters (number 2)
009C	msbRetSeq1	MSB of return address for script sequencer 0
009D	msbRetSeq2	MSB of return address for script sequencer 1
009E	msbRetSeq3	MSB of return address for script sequencer 2
009F	msbRetSeq4	MSB of return address for script sequencer 3
00A0	lsbRetSeq1	LSB of return address for script sequencer 0
00A1	lsbRetSeq2	LSB of return address for script sequencer 1
00A2	lsbRetSeq3	LSB of return address for script sequencer 2
00A3	lsbRetSeq4	LSB of return address for script sequencer 3
00A4	cmdSeq1	Sound command running on sequencer 0
00A5	cmdSeq2	Sound command running on sequencer 1
00A6	cmdSeq3	Sound command running on sequencer 2
00A7	cmdSeq4	Sound command running on sequencer 3
00A8	volDec00	not-zero to decrement volume on AY0-0
00A9	volDec01	not-zero to decrement volume on AY0-1
00AA	volDec02	not-zero to decrement volume on AY0-2
00AB	volDec10	not-zero to decrement volume on AY1-0
00AC	volDec11	not-zero to decrement volume on AY1-1
00AD	volDec12	not-zero to decrement volume on AY1-2
00AE	volCnt00	counter to decrement volume on AY0-0
00AF	volCnt01	counter to decrement volume on AY0-1
00B0	volCnt02	counter to decrement volume on AY0-2
00B1	volCnt10	counter to decrement volume on AY1-0
00B2	volCnt11	counter to decrement volume on AY1-1
00B3	volCnt12	counter to decrement volume on AY1-2
00B4	volRel00	reload for decrement volume on AY0-0
00B5	volRel01	reload for decrement volume on AY0-1
00B6	volRel02	reload for decrement volume on AY0-2
00B7	volRel10	reload for decrement volume on AY1-0
00B8	volRel11	reload for decrement volume on AY1-1
00B9	volRel12	reload for decrement volume on AY1-2
00BA	curMix0	current mixer value for AY0
00BB	curMix1	current mixer value for AY1
00BC	sndCmd	sound command (FF for none)
00BD	nmiTick	NMI tick counter for non-NMI users
00BE	strmStatus	status of sample streamers. 000000_AB A=801 (1=stopped), B=802 (1=stopped)
00BF	nmiTick2	NMI tick counter
00C0	sndProcTmr	timer for AY sound processing (0 means not time)
00C1	curSamp801	current value of sampler 801
00C2	curSamp802	current value of sampler 802
00C3:00C4	byteCnt801	counter to bytes to play out 801
00C5:00C6	byteCnt802	counter to bytes to play out 802
00C7:00C8	ptr801	pointer to bytes to play out 801
00C9:00CA	ptr802	pointer to bytes to play out 802
00CB	lastCmd	last requested sound command
00CC	m00CC	Not used
00CD:00CE	curSeqPtr	temporary storage: current sequence pointer
00CF:00D0	tmpFreq	temporary storage: used in frequency sweeper
00D1:00D2	curVoice	temporary storage: current voice for sequence processing
00D3:00D7	m00D3	Not used
00D8	brdStatus	board status to return to main board. Set to $13 at start. Bit 0 is the status of the sample player.

80 - CF cleared at startup (doesn't get all temporaries)

Stack builds to lower memory from FF