Atari Falcon Hardware Registers
FALCON REGISTERS 1
****************************************************************************
* *
* *
* ===================================================================== *
* A T A R I - F A L C O N - H A R D W A R E - R E G I S T E R S *
* ===================================================================== *
* *
* *
* T R Y O F D O C U M E N T A T I O N B Y *
* *
* A E O N & C H R I S *
* *
* O F A U R A *
* *
* VERSION 0.4 (11.04.93) *
* *
* FIRST OFFICIAL RELEASE *
* *
****************************************************************************
For any questions and donations write to:
AURA
PLK 019200 C
W-7600 OFFENBURG
GERMANY
If you have found some new things about the hardware just contact us.
Don't forget to include international reply coupons if you expect an
answer.
Remember:
Donations will force us to release more informations about the hardware.
signing: AEON/CHRIS OF AURA
----------------------------------------------------------------------------
******: seems to be unused
new : new FALCON-adresses
new<==: perhaps new FALCON registers
<=====: new FALCON registers
****************************************************************************
I D E - P O R T ( F A L C O N )
****************************************************************************
$FFF00000 [R/W] :$?? <=====
: : :
: : :
$FFF0003F [R/W] :$?? <=====
****************************************************************************
M E M O R Y - M A N A G E M E N T ( S T )
****************************************************************************
$FFFF8000 [R/W] :$8F ******
$FFFF8001 [R/W] :$00 Memory-Configuration
****************************************************************************
? ? ?
****************************************************************************
$FFFF8006 [R/W] :$56 76______................................Monitor-Type Hi
||
00 --------- SM124 and compatible
01 --------- SC1435 and compatible
10 --------- VGA and SYNC-monitors
11 --------- TV
$FFFF8007 [R/W] :$65 <=====
$FFFF800C [R/W] :$8F ******
$FFFF800D [R/W] :$00 <=====
****************************************************************************
V I D E O - S Y S T E M ( F A L C O N )
****************************************************************************
$FFFF8200 [R/W] :$8F ******
$FFFF8201 [R/W] :$3F Video-Address Hi
$FFFF8202 [R/W] :$8F ******
$FFFF8203 [R/W] :$82 Video-Address Mi
$FFFF8204 [R/W] :$8F ******
$FFFF8205 [R/W] :$3F Video-Address-Counter Hi
$FFFF8206 [R/W] :$8F ******
$FFFF8207 [R/W] :$AB Video-Address-Counter Mi
$FFFF8208 [R/W] :$8F ******
$FFFF8209 [R/W] :$D2 Video-Address-Counter Lo
$FFFF820A [R/W] :$02 ______10 ..................................... Syncmode
||
|+----- 1: external clock
| 0: internal clock
+------ set to one (ex-50/60 Hz-Bit)
$FFFF820B [R/W] :$00 ******
$FFFF820C [R/W] :$8F ******
$FFFF820D [R/W] :$00 Video-Address Lo
$FFFF820E [R/W] :$00 _______0 ................................. Line-Wide Hi
$FFFF820F [R/W] :$00 76543210 ................................. Line-Wide Lo
This register is used to configure the
worddistanz from the end of one to the
beginning of the next graphic line.
Example: $0050 adds 80 words (160 bytes) after
every line to the Videoaddress.
$FFFF8210 [R/W] :$00 ______10 ............................. Vertical-Wrap Hi
$FFFF8211 [R/W] :$50 76543210 ..............................Vertical-Wrap Lo
This register is used to configure the
wordlengh of one graphic line.
Example: ST-Low : $0050= 80 words
256 Colors/640x200: $0140=320 words
True-Color/320x400: $0140=320 words
$FFFF8212 [R/W] :$8F ******
: : : :
: : : :
$FFFF823F [R/W] :$6A ******
$FFFF8240 [R/W] :$0F ST Color $00 Hi
$FFFF8241 [R/W] :$0F Lo
$FFFF8242 [R/W] :$0F ST Color $01 Hi
$FFFF8243 [R/W] :$0F Lo
$FFFF8244 [R/W] :$00 ST Color $02 Hi
$FFFF8245 [R/W] :$00 Lo
$FFFF8246 [R/W] :$00 ST Color $03 Hi
$FFFF8247 [R/W] :$00 Lo
$FFFF8248 [R/W] :$00 ST Color $04 Hi
$FFFF8249 [R/W] :$00 Lo
$FFFF824A [R/W] :$0F ST Color $05 Hi
$FFFF824B [R/W] :$0F Lo
$FFFF824C [R/W] :$00 ST Color $06 Hi
$FFFF824D [R/W] :$00 Lo
$FFFF824E [R/W] :$0D ST Color $07 Hi
$FFFF824F [R/W] :$0D Lo
$FFFF8250 [R/W] :$04 ST Color $08 Hi
$FFFF8251 [R/W] :$04 Lo
$FFFF8252 [R/W] :$05 ST Color $09 Hi
$FFFF8253 [R/W] :$05 Lo
$FFFF8254 [R/W] :$00 ST Color $0A Hi
$FFFF8255 [R/W] :$00 Lo
$FFFF8256 [R/W] :$05 ST Color $0B Hi
$FFFF8257 [R/W] :$05 Lo
$FFFF8258 [R/W] :$00 ST Color $0C Hi
$FFFF8259 [R/W] :$00 Lo
$FFFF825A [R/W] :$05 ST Color $0D Hi
$FFFF825B [R/W] :$05 Lo
$FFFF825C [R/W] :$00 ST Color $0E Hi
$FFFF825D [R/W] :$00 Lo
$FFFF825E [R/W] :$00 ST Color $0F Hi
$FFFF825F [R/W] :$00 Lo
$FFFF8260 [R/W] :$01 ______10 ..................................... ST-Shift
||
00---- ST-Lowres
01---- ST-Medres
10---- ST-Highres
11---- not defined
$FFFF8261 [R/W] :$00 ******
$FFFF8262 [R/W] :$00 ******
$FFFF8263 [R/W] :$00 ******
$FFFF8264 [R/W] :$00 ________ ..........................Horizontal-Scroll Hi
$FFFF8265 [R/W] :$00 ____3210 ..........................Horizontal-Scroll Lo
||||
++++---- 0-15: left shifted pixel
$FFFF8266 [R/W] :$00 _____2_0 .............................. Falcon-Shift Hi
| |
| +---- 1: True-color mode
+------ 1: 2-color mode
$FFFF8267 [R/W] :$00 _654____ ...............................Falcon-Shift Lo
|||
||+-------- 1: 256-color mode
|+--------- 0: internal vertical sync
| 1: external vertical sync
+---------- 0: internal horizontal sync
1: external horizontal sync
$FFFF8268 [R/W] :$00 ******
: : : :
: : : :
$FFFF827F [R/W] :$00 ******
$FFFF8280 [R/W] :$00 ______10 ................... Horizontal-hold-counter Hi
$FFFF8281 [R/W] :$0F 76543210 ................... Horizontal-hold-counter Lo
You can only read this register.
$FFFF8282 [R/W] :$00 ______10 ..................... Horizontal-hold-timer Hi
$FFFF8283 [R/W] :$00 76543210 ..................... Horizontal-hold-timer Lo
$FFFF8284 [R/W] :$00 ______10 ................... Horizontal-border-begin Hi
$FFFF8285 [R/W] :$00 76543210 ................... Horizontal-border-begin Lo
$FFFF8286 [R/W] :$00 ______10 ..................... Horizontal-border-end Hi
$FFFF8287 [R/W] :$00 76543210 ..................... Horizontal-border-end Lo
$FFFF8288 [R/W] :$02 ______10 .................. Horizontal-display-begin Hi
$FFFF8289 [R/W] :$02 76543210 .................. Horizontal-display-begin Lo
$FFFF828A [R/W] :$00 ______10 .................... Horizontal-display-end Hi
$FFFF828B [R/W] :$00 76543210 .................... Horizontal-display-end Lo
$FFFF828C [R/W] :$00 ______10 ............................. Horizontal-SS Hi
$FFFF828D [R/W] :$00 76543210 ............................. Horizontal-SS Lo
$FFFF828E [R/W] :$00 _______0 ............................. Horizontal-FS Hi
$FFFF828F [R/W] :$00 76543210 ............................. Horizontal-FS Lo
$FFFF8290 [R/W] :$00 _______0 ............................. Horizontal-HH Hi
$FFFF8291 [R/W] :$00 76543210 ............................. Horizontal-HH Lo
$FFFF8292 [R/W] :$00 ******
: : : :
: : : :
$FFFF829F [R/W] :$00 ******
$FFFF82A0 [R/W] :$01 _____210 ................. Vertical-frequenz-counter Hi
$FFFF82A1 [R/W] :$9C 76543210 ................. Vertical-freuqenz-counter Lo
You can only read this register.
$FFFF82A2 [R/W] :$02 _____210 ................... Vertical-frequenz-timer Hi
$FFFF82A3 [R/W] :$02 76543210 ................... Vertical-frequenz-timer Lo
$FFFF82A4 [R/W] :$02 _____210 ..................... Vertical-border-begin Hi
$FFFF82A5 [R/W] :$02 76543210 ..................... Vertical-border-begin Lo
$FFFF82A6 [R/W] :$00 _____210 ....................... Vertical-border-end Hi
$FFFF82A7 [R/W] :$00 76543210 ....................... Vertical-border-end Lo
$FFFF82A8 [R/W] :$00 _____210 .................... Vertical-display-begin Hi
$FFFF82A9 [R/W] :$00 76543210 .....................Vertical-display-begin Lo
$FFFF82AA [R/W] :$01 _____210 .......................Vertical-display-end Hi
$FFFF82AB [R/W] :$01 76543210 .......................Vertical-display-end Lo
$FFFF82AC [R/W] :$02 _____210 ................................Vertical-SS Hi
$FFFF82AD [R/W] :$02 76543210 ................................Vertical-SS Lo
$FFFF82AE [R/W] :$00 ******
: : : :
: : : :
$FFFF82BF [R/W] :$00 ******
$FFFF82C0 [R/W] :$00 <===== Hi
$FFFF82C1 [R/W] :$00 <===== Lo
$FFFF82C2 [R/W] :$00 ________ ............................. Video-Control Hi
$FFFF82C3 [R/W] :$00 _____21_ ............................. Video-Control Lo
||
|+----- 1: interlace on
+------ 0: 320 pixel horizontal
1: 640 pixel horizontal
****************************************************************************
D M A / D I S K - C O N T R O L L E R ( S T )
****************************************************************************
$FFFF8604 [R/W] :$00A0 FDC / Sektor Count
$FFFF8606 [R/-] :$0001 DMA Status
[-/W] :$0001 DMA Mode
$FFFF8608 [R/W] :$00 ******
$FFFF8609 [R/-] :$00 Count Hi
[-/W] :$00 DMA Base Hi
$FFFF860A [R/W] :$00 ******
$FFFF860B [R/-] :$20 Count Mi
[-/W] :$20 DMA Base Mi
$FFFF860C [R/W] :$00 ******
$FFFF860D [R/-] :$C6 Count Lo
[-/W] :$C6 DMA Base Lo
$FFFF860E [R/W] :$00 <=====
$FFFF860F [R/W] :$80 <=====
****************************************************************************
P S G - S O U N D C H I P AY-3-8910 ( S T )
****************************************************************************
$FFFF8800 [R/-] :$67 Read Data
[-/W] :$67 Register Selection
$FFFF8801 [R/W] :$FF ******
$FFFF8802 [R/W] :$CF Write Data
$FFFF8803 [R/W] :$FF ******
NOTE: The PSG-Registers are now fixed at 2 addresses($8800.w/$8802.w).
Accessing the shadowregisters ($8804.w-$8900.w) cause a buserror.
****************************************************************************
P C M - S O U N D C H I P ( C O D E C )
****************************************************************************
$FFFF8900 [R/W] :$05 ____3210 ......................... Sound-DMA-Control Hi
||||
|||| MFP-IRQ-7
||00---- no request
||01---- after playing a frame
||10---- after recording a frame
||11---- after playing or recording a frame
||
|| Timer-A-Request
00------ no request
01------ after playing a frame
10------ after recording a frame
11------ after playing or recording a frame
$FFFF8901 [R/W] :$00 7_54__10 ......................... Sound-DMA-Control Lo
| || ||
| || |+---- 1: DMA-Play enable
| || +----- 1: DMA-Play frame repeat
| |+-------- 1: DMA-Record enable
| +--------- 1: DMA-Record frame repeat
+----------- 0: select playframe-adresses
1: select recordfame-adresses
..................................Frame-Addresses
$FFFF8902 [R/W] :$00 ******
$FFFF8903 [R/W] :$01 Frame-Start-Address Hi
$FFFF8904 [R/W] :$00 ******
$FFFF8905 [R/W] :$29 Frame-Start-Address Mi
$FFFF8906 [R/W] :$00 ******
$FFFF8907 [R/W] :$9C Frame-Start-Address Lo
$FFFF8908 [R/W] :$00 ******
$FFFF8909 [R/W] :$01 Frame-Address-Counter Hi
$FFFF890A [R/W] :$00 ******
$FFFF890B [R/W] :$29 Frame-Address-Counter Mi
$FFFF890C [R/W] :$00 ******
$FFFF890D [R/W] :$9C Frame-Address-Counter Lo
$FFFF890E [R/W] :$00 ******
$FFFF890F [R/W] :$02 Frame-End-Address Hi
$FFFF8910 [R/W] :$00 ******
$FFFF8911 [R/W] :$B0 Frame-End-Address Mi
$FFFF8912 [R/W] :$00 ******
$FFFF8913 [R/W] :$3C Frame-End-Address Lo
****************************************************************************
* *
* *
* ===================================================================== *
* A T A R I - F A L C O N - H A R D W A R E - R E G I S T E R S *
* ===================================================================== *
* *
* *
* T R Y O F D O C U M E N T A T I O N B Y *
* *
* A E O N & C H R I S *
* *
* O F A U R A *
* *
* VERSION 0.4 (11.04.93) *
* *
* FIRST OFFICIAL RELEASE *
* *
****************************************************************************
For any questions and donations write to:
AURA
PLK 019200 C
W-7600 OFFENBURG
GERMANY
If you have found some new things about the hardware just contact us.
Don't forget to include international reply coupons if you expect an
answer.
Remember:
Donations will force us to release more informations about the hardware.
signing: AEON/CHRIS OF AURA
----------------------------------------------------------------------------
******: seems to be unused
new : new FALCON-adresses
new<==: perhaps new FALCON registers
<=====: new FALCON registers
****************************************************************************
I D E - P O R T ( F A L C O N )
****************************************************************************
$FFF00000 [R/W] :$?? <=====
: : :
: : :
$FFF0003F [R/W] :$?? <=====
****************************************************************************
M E M O R Y - M A N A G E M E N T ( S T )
****************************************************************************
$FFFF8000 [R/W] :$8F ******
$FFFF8001 [R/W] :$00 Memory-Configuration
****************************************************************************
? ? ?
****************************************************************************
$FFFF8006 [R/W] :$56 76______................................Monitor-Type Hi
||
00 --------- SM124 and compatible
01 --------- SC1435 and compatible
10 --------- VGA and SYNC-monitors
11 --------- TV
$FFFF8007 [R/W] :$65 <=====
$FFFF800C [R/W] :$8F ******
$FFFF800D [R/W] :$00 <=====
****************************************************************************
V I D E O - S Y S T E M ( F A L C O N )
****************************************************************************
$FFFF8200 [R/W] :$8F ******
$FFFF8201 [R/W] :$3F Video-Address Hi
$FFFF8202 [R/W] :$8F ******
$FFFF8203 [R/W] :$82 Video-Address Mi
$FFFF8204 [R/W] :$8F ******
$FFFF8205 [R/W] :$3F Video-Address-Counter Hi
$FFFF8206 [R/W] :$8F ******
$FFFF8207 [R/W] :$AB Video-Address-Counter Mi
$FFFF8208 [R/W] :$8F ******
$FFFF8209 [R/W] :$D2 Video-Address-Counter Lo
$FFFF820A [R/W] :$02 ______10 ..................................... Syncmode
||
|+----- 1: external clock
| 0: internal clock
+------ set to one (ex-50/60 Hz-Bit)
$FFFF820B [R/W] :$00 ******
$FFFF820C [R/W] :$8F ******
$FFFF820D [R/W] :$00 Video-Address Lo
$FFFF820E [R/W] :$00 _______0 ................................. Line-Wide Hi
$FFFF820F [R/W] :$00 76543210 ................................. Line-Wide Lo
This register is used to configure the
worddistanz from the end of one to the
beginning of the next graphic line.
Example: $0050 adds 80 words (160 bytes) after
every line to the Videoaddress.
$FFFF8210 [R/W] :$00 ______10 ............................. Vertical-Wrap Hi
$FFFF8211 [R/W] :$50 76543210 ..............................Vertical-Wrap Lo
This register is used to configure the
wordlengh of one graphic line.
Example: ST-Low : $0050= 80 words
256 Colors/640x200: $0140=320 words
True-Color/320x400: $0140=320 words
$FFFF8212 [R/W] :$8F ******
: : : :
: : : :
$FFFF823F [R/W] :$6A ******
$FFFF8240 [R/W] :$0F ST Color $00 Hi
$FFFF8241 [R/W] :$0F Lo
$FFFF8242 [R/W] :$0F ST Color $01 Hi
$FFFF8243 [R/W] :$0F Lo
$FFFF8244 [R/W] :$00 ST Color $02 Hi
$FFFF8245 [R/W] :$00 Lo
$FFFF8246 [R/W] :$00 ST Color $03 Hi
$FFFF8247 [R/W] :$00 Lo
$FFFF8248 [R/W] :$00 ST Color $04 Hi
$FFFF8249 [R/W] :$00 Lo
$FFFF824A [R/W] :$0F ST Color $05 Hi
$FFFF824B [R/W] :$0F Lo
$FFFF824C [R/W] :$00 ST Color $06 Hi
$FFFF824D [R/W] :$00 Lo
$FFFF824E [R/W] :$0D ST Color $07 Hi
$FFFF824F [R/W] :$0D Lo
$FFFF8250 [R/W] :$04 ST Color $08 Hi
$FFFF8251 [R/W] :$04 Lo
$FFFF8252 [R/W] :$05 ST Color $09 Hi
$FFFF8253 [R/W] :$05 Lo
$FFFF8254 [R/W] :$00 ST Color $0A Hi
$FFFF8255 [R/W] :$00 Lo
$FFFF8256 [R/W] :$05 ST Color $0B Hi
$FFFF8257 [R/W] :$05 Lo
$FFFF8258 [R/W] :$00 ST Color $0C Hi
$FFFF8259 [R/W] :$00 Lo
$FFFF825A [R/W] :$05 ST Color $0D Hi
$FFFF825B [R/W] :$05 Lo
$FFFF825C [R/W] :$00 ST Color $0E Hi
$FFFF825D [R/W] :$00 Lo
$FFFF825E [R/W] :$00 ST Color $0F Hi
$FFFF825F [R/W] :$00 Lo
$FFFF8260 [R/W] :$01 ______10 ..................................... ST-Shift
||
00---- ST-Lowres
01---- ST-Medres
10---- ST-Highres
11---- not defined
$FFFF8261 [R/W] :$00 ******
$FFFF8262 [R/W] :$00 ******
$FFFF8263 [R/W] :$00 ******
$FFFF8264 [R/W] :$00 ________ ..........................Horizontal-Scroll Hi
$FFFF8265 [R/W] :$00 ____3210 ..........................Horizontal-Scroll Lo
||||
++++---- 0-15: left shifted pixel
$FFFF8266 [R/W] :$00 _____2_0 .............................. Falcon-Shift Hi
| |
| +---- 1: True-color mode
+------ 1: 2-color mode
$FFFF8267 [R/W] :$00 _654____ ...............................Falcon-Shift Lo
|||
||+-------- 1: 256-color mode
|+--------- 0: internal vertical sync
| 1: external vertical sync
+---------- 0: internal horizontal sync
1: external horizontal sync
$FFFF8268 [R/W] :$00 ******
: : : :
: : : :
$FFFF827F [R/W] :$00 ******
$FFFF8280 [R/W] :$00 ______10 ................... Horizontal-hold-counter Hi
$FFFF8281 [R/W] :$0F 76543210 ................... Horizontal-hold-counter Lo
You can only read this register.
$FFFF8282 [R/W] :$00 ______10 ..................... Horizontal-hold-timer Hi
$FFFF8283 [R/W] :$00 76543210 ..................... Horizontal-hold-timer Lo
$FFFF8284 [R/W] :$00 ______10 ................... Horizontal-border-begin Hi
$FFFF8285 [R/W] :$00 76543210 ................... Horizontal-border-begin Lo
$FFFF8286 [R/W] :$00 ______10 ..................... Horizontal-border-end Hi
$FFFF8287 [R/W] :$00 76543210 ..................... Horizontal-border-end Lo
$FFFF8288 [R/W] :$02 ______10 .................. Horizontal-display-begin Hi
$FFFF8289 [R/W] :$02 76543210 .................. Horizontal-display-begin Lo
$FFFF828A [R/W] :$00 ______10 .................... Horizontal-display-end Hi
$FFFF828B [R/W] :$00 76543210 .................... Horizontal-display-end Lo
$FFFF828C [R/W] :$00 ______10 ............................. Horizontal-SS Hi
$FFFF828D [R/W] :$00 76543210 ............................. Horizontal-SS Lo
$FFFF828E [R/W] :$00 _______0 ............................. Horizontal-FS Hi
$FFFF828F [R/W] :$00 76543210 ............................. Horizontal-FS Lo
$FFFF8290 [R/W] :$00 _______0 ............................. Horizontal-HH Hi
$FFFF8291 [R/W] :$00 76543210 ............................. Horizontal-HH Lo
$FFFF8292 [R/W] :$00 ******
: : : :
: : : :
$FFFF829F [R/W] :$00 ******
$FFFF82A0 [R/W] :$01 _____210 ................. Vertical-frequenz-counter Hi
$FFFF82A1 [R/W] :$9C 76543210 ................. Vertical-freuqenz-counter Lo
You can only read this register.
$FFFF82A2 [R/W] :$02 _____210 ................... Vertical-frequenz-timer Hi
$FFFF82A3 [R/W] :$02 76543210 ................... Vertical-frequenz-timer Lo
$FFFF82A4 [R/W] :$02 _____210 ..................... Vertical-border-begin Hi
$FFFF82A5 [R/W] :$02 76543210 ..................... Vertical-border-begin Lo
$FFFF82A6 [R/W] :$00 _____210 ....................... Vertical-border-end Hi
$FFFF82A7 [R/W] :$00 76543210 ....................... Vertical-border-end Lo
$FFFF82A8 [R/W] :$00 _____210 .................... Vertical-display-begin Hi
$FFFF82A9 [R/W] :$00 76543210 .....................Vertical-display-begin Lo
$FFFF82AA [R/W] :$01 _____210 .......................Vertical-display-end Hi
$FFFF82AB [R/W] :$01 76543210 .......................Vertical-display-end Lo
$FFFF82AC [R/W] :$02 _____210 ................................Vertical-SS Hi
$FFFF82AD [R/W] :$02 76543210 ................................Vertical-SS Lo
$FFFF82AE [R/W] :$00 ******
: : : :
: : : :
$FFFF82BF [R/W] :$00 ******
$FFFF82C0 [R/W] :$00 <===== Hi
$FFFF82C1 [R/W] :$00 <===== Lo
$FFFF82C2 [R/W] :$00 ________ ............................. Video-Control Hi
$FFFF82C3 [R/W] :$00 _____21_ ............................. Video-Control Lo
||
|+----- 1: interlace on
+------ 0: 320 pixel horizontal
1: 640 pixel horizontal
****************************************************************************
D M A / D I S K - C O N T R O L L E R ( S T )
****************************************************************************
$FFFF8604 [R/W] :$00A0 FDC / Sektor Count
$FFFF8606 [R/-] :$0001 DMA Status
[-/W] :$0001 DMA Mode
$FFFF8608 [R/W] :$00 ******
$FFFF8609 [R/-] :$00 Count Hi
[-/W] :$00 DMA Base Hi
$FFFF860A [R/W] :$00 ******
$FFFF860B [R/-] :$20 Count Mi
[-/W] :$20 DMA Base Mi
$FFFF860C [R/W] :$00 ******
$FFFF860D [R/-] :$C6 Count Lo
[-/W] :$C6 DMA Base Lo
$FFFF860E [R/W] :$00 <=====
$FFFF860F [R/W] :$80 <=====
****************************************************************************
P S G - S O U N D C H I P AY-3-8910 ( S T )
****************************************************************************
$FFFF8800 [R/-] :$67 Read Data
[-/W] :$67 Register Selection
$FFFF8801 [R/W] :$FF ******
$FFFF8802 [R/W] :$CF Write Data
$FFFF8803 [R/W] :$FF ******
NOTE: The PSG-Registers are now fixed at 2 addresses($8800.w/$8802.w).
Accessing the shadowregisters ($8804.w-$8900.w) cause a buserror.
****************************************************************************
P C M - S O U N D C H I P ( C O D E C )
****************************************************************************
$FFFF8900 [R/W] :$05 ____3210 ......................... Sound-DMA-Control Hi
||||
|||| MFP-IRQ-7
||00---- no request
||01---- after playing a frame
||10---- after recording a frame
||11---- after playing or recording a frame
||
|| Timer-A-Request
00------ no request
01------ after playing a frame
10------ after recording a frame
11------ after playing or recording a frame
$FFFF8901 [R/W] :$00 7_54__10 ......................... Sound-DMA-Control Lo
| || ||
| || |+---- 1: DMA-Play enable
| || +----- 1: DMA-Play frame repeat
| |+-------- 1: DMA-Record enable
| +--------- 1: DMA-Record frame repeat
+----------- 0: select playframe-adresses
1: select recordfame-adresses
..................................Frame-Addresses
$FFFF8902 [R/W] :$00 ******
$FFFF8903 [R/W] :$01 Frame-Start-Address Hi
$FFFF8904 [R/W] :$00 ******
$FFFF8905 [R/W] :$29 Frame-Start-Address Mi
$FFFF8906 [R/W] :$00 ******
$FFFF8907 [R/W] :$9C Frame-Start-Address Lo
$FFFF8908 [R/W] :$00 ******
$FFFF8909 [R/W] :$01 Frame-Address-Counter Hi
$FFFF890A [R/W] :$00 ******
$FFFF890B [R/W] :$29 Frame-Address-Counter Mi
$FFFF890C [R/W] :$00 ******
$FFFF890D [R/W] :$9C Frame-Address-Counter Lo
$FFFF890E [R/W] :$00 ******
$FFFF890F [R/W] :$02 Frame-End-Address Hi
$FFFF8910 [R/W] :$00 ******
$FFFF8911 [R/W] :$B0 Frame-End-Address Mi
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$FFFF8913 [R/W] :$3C Frame-End-Address Lo
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