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27 March 2010
Posted in
Document Library -
Atari Memos and Documents
Memory Map for Firefox Main PCB - Main Processor
Jed Margolin
1/9/84
-------------------------------------------------------------------------------
0000 - 07FF R/W RAM 0 (not)
0800 - 0FFF R/W RAM 1 (not)
-------------------------------------------------------------------------------
1000 - 1FFF R/W ALPHA (not) Graphics Alphanumerics
2000 - 2FFF R/W MOTION (not) Graphics Motion Objects
-------------------------------------------------------------------------------
3000 - 3FFF R TABLE (not) Table Rom, (32) 4K segments
selected by WRTREG
-------------------------------------------------------------------------------
4000 - 40FF R/W NOVRAM (not)
-------------------------------------------------------------------------------
4100 - 41FF R INPUTS (not)
4100 R RDIN 0 (not) 0 = active
D7 - Left Fire
D6 - Right Fire
D5 - Left Thumb
D4 - Right Thumb
D3 - Slam
D2 - Self-Test
D1 - Spare
D0 - unused
4101 R RDIN 1 (not)
D7 - MAIN FLAG (Sound processor)
D6 - SOUNDFLAG (Sound Processor)
D5 - VBLANK
D4 - Diagnostic (0 = active)
D3 - unused
D2 - COIN AUX (0 = active)
D1 - COIN LEFT (0 = active)
D0 - COIN RIGHT (0 = active)
4102 R RDIN 2 (not)
D7 - DSK DAV
D6 - DSK FULL
D5 - DISK OPR
4103 R OPT 0 (not) Option Switch 0
4104 R OPT 1 (not) Option Switch 1
4105 R DREAD (not) Disc Interface: Read Input Data,
(Resets RD DSK Line)
4106 R RDSOUND(not) Sound Interface: Read Input Data,
(Resets Sound Flag)
4107 R ADC (not) A/D Converter Output
-------------------------------------------------------------------------------
4200 - 4238 W OUTPUTS (not) Strobed by 6809 Store Instructions,
No Data Required
4200 W RSTIRQ(not) Reset IRQ Latch
4208 W RSTFIRQ(not) Reset FIRQ Latch
4210 W WDCLR(not) Reset Watchdog Timer (32 ms timeout)
4218 W DSKREAD(not) Disc Interface, set up for DREAD(not)
4220 W ADCSTART(not) Start A/D Converter, Channel 0;
Do STA, NOP, STA.
4221 W ADCSTART(not) Start A/D Converter, Channel 1
Do STA, NOP, STA.
4228 W unused
4230 W AMUCK(not) Causes Hardware RESET when 6809 runs amuck.
4238 W unused
-------------------------------------------------------------------------------
4280 - 4287 W Latched output bits, D7 = Latched Data Bit
4280 W NVRECALL Recall NOVRAM, 1=Recall
4281 W RSTSOUND Reset Sound Processor, 1=Reset
4282 W NVRSTORE Store NOVRAM, 1 = Store
4283 W LOCK(not) 0=Disc Lock, 1=Graphics Board Lock
4284 W SWDSKR Right Disk Audio Enable, 1=on
4285 W SWDSKL Left Disk Audio Enable, 1=on
4286 W RSTDSK(not)
4287 W WRDSK(not) 0 = Set up Disc Interface to do Write
4288 - 428F W Latched output bits, D7 = Latched Data Bit
4288 W COIN COUNTER 2, 1=on
4289 W COIN COUNTER 1, 1=on
428A W unused
428B W unused
428C W LED 1, 0=on
428D W LED 2, 0=on
428E W LED 3, 0=on
428F W LED 4, 0=on
-------------------------------------------------------------------------------
4290 - 42B8 W OUTPUTS (not) Strobed by 6809 Store Instructions,
No Data Required
4290 W WRTREG Write Table Register, D0-D4
4298 W WRSOUND Write Sound Interface Register
42A0 W DSKLATCH Write to Disc Interface Latch
42A8 W unused
42B0 W unused
42B8 W unused
-------------------------------------------------------------------------------
4300 - 43FF R/W unused
-------------------------------------------------------------------------------
4400 - 7FFF R ROM 0 (15K)
8000 - BFFF R ROM 1 (16K)
C000 - FFFF R ROM 2 (16K)
-------------------------------------------------------------------------------
Notes:
1. When using A/D Converter, only one channel can be used at a time.
To start it, use two 6809 store instructions, separated by a NOP.
Example: STA ADCSTART+1
NOP
STA ADCSTART+1
2. To Read the Disc Interface: Set the DSKREAD Line (to turn on the
Disc's Latch output), then read DREAD. (This will Reset DSKREAD.
Example:
STA DSKREAD
LDA DREAD
ACCA contains input data
3. To Write to the Disc Interface: Write the Data to the DSKLATCH,
make WRDSK Low, then make WRDSK high. (This must be done with
minimal delay.)
Example:
ACCA contains Data
STA DSKLATCH
CLRA
LDB #0FF
STA WRDSK
STB WRDSK
Memory Map for Firefox Main PCB - Sound Processor
0000 - 07FF R/W SRAM (not) Sound Processor Program RAM
-------------------------------------------------------------------------------
0800 - 087F R/W PIA (RAM)
0880 R/W PIA (PORT A DATA)
0881 R/W PIA (PORT A DIR)
0882 R/W PIA (PORT B DATA)
0883 R/W PIA (PORT B DIR)
0884-089F R/W PIA (CONTROL)
-------------------------------------------------------------------------------
1000 R SI (not) Read interface input latch
1800 W SO (not) Write to interface output latch
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2000-2007 R/W CIO-0 (SOUND)
2008-200F R/W CIO-0 (CONTROL)
2800-2807 R/W CIO-1 (SOUND)
2808-280F R/W CIO-1 (CONTROL)
3000-3007 R/W CIO-2 (SOUND)
3008-300F R/W CIO-2 (CONTROL)
3800-3807 R/W CIO-3 (SOUND)
3808-380F R/W CIO-3 (CONTROL)
-------------------------------------------------------------------------------
4000 - 7FFF R SROM 0 (not) (16K)
8000 - BFFF R SROM 1 (not) (16K)
C000 - FFFF R SROM 2 (not) (16K)
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