FALCON REGISTERS 2

HOW to access the play/record-frame:
You have to set bit 7 of $8901.w to select play- or record-shadowregister, 
then access the frame-begin/end-registers! The play- and record-shadow-
register are two seperate registers; they appear only at the same 
addresses!

$FFFF8920 [R/W] :$00 __54__10 ........................... Track-Play-Control
                       ||  ||
                       ||  00---- play 1 track
                       ||  01---- play 2 tracks
                       ||  10---- play 3 tracks
                       ||  11---- play 4 tracks
                       00 ------- connect track 1 with speaker
                       01 ------- connect track 2 with speaker
                       10 ------- connect track 3 with speaker
                       11 ------- connect track 4 with speaker
$FFFF8921 [R/W] :$03 76____10 ........................... Sound-Mode-Control
                     ||    ||
                     ||    00---- nute condition (on STE: 6258 Hz)
                     ||    01---- 12517 HZ 
                     ||    10---- 25033 HZ
                     ||    11---- 50066 HZ
                     |+---------- 0:  8 Bit
                     |            1: 16 Bit
                     +----------- 0: Stereo
                                  1: Mono
Nice to know: The samplerate 6258 Hz was repleaced by a nute condition.
              You can use it to deactivate the DMA-Transfer.

$FFFF8922 [R/-] :$00 not accessed by the XBIOS.
$FFFF8923 [R/-] :$00 The FALCON has no 
$FFFF8924 [R/-] :$00 Microwire-
$FFFF8925 [R/-] :$00 Interface!!
$FFFF8930 [R/W] :$01 76543210 ......... Sound-Source-Device-Prescale-Mode Hi 
                     ||||||||
                     ||||||||     Source-Device: EXT-INP
                     |||||||+---- 1: Handshaking off
                     |||||++----- Source-Clock
                     ||||+------- set to zero
                     ||||
                     ||||         Source-Device: A/D-Converter
                     |||+-------- set to zero
                     ||+--------- 0: internal 25.175 MHz-Clock
                     ||           1: extermal Clock
                     ++---------- set to zero
$FFFF8931 [R/W] :$11 76543210 ......... Sound-Source-Device-Prescale-Mode Lo
                     ||||||||
                     ||||||||     Source-Device: DMA-PLAY
                     |||||||+---- 1: Handshaking off
                     |||||++----- Source-Clock
                     ||||+------- 0: if handshaking on and destination=
                     ||||            DSP-REC
                     ||||         1: if destination<>DSP-REC
                     ||||         (this allows a automatic transfer from
                     ||||         (memory to DSP without errors.)
                     ||||         
                     ||||         Source-Device: DSP-XMIT
                     |||+-------- 1: Handshaking off
                     |++--------- Source-Clock
                     +----------- 0: Tristate, disconnect DSP from Multi-
                                     plexer (only if you want to use the 
                                     external SSI-Port)
                                  1: connect DSP with Multiplexer
Source-Clock can be :   %00: internal 25.175 MHz-Clock
                        %01: external Clock
                        %10: intermal 32 MHz-Clock,do not use it for the
                             CODEC (A/D- and D/A-Converter).
                        %11: not defined

$FFFF8932 [R/W] :$00 76543210 ........... Sound-Destination-Device-Matrix Hi
                     ||||||||
                     ||||||||     Source-Device for destination: EXT-OUT
                     |||||||+---- 1: Handshaking off
                     |||||++----- Source-Device
                     ||||+------- set to zero
                     ||||
                     ||||         Source-Device for destination: DAC
                     |||+-------- set to zero
                     |++--------- Source-Device
                     +----------- set to zero
$FFFF8933 [R/W] :$00 76543210 ........... Sound-Destination-Device-Matrix Lo
                     ||||||||
                     ||||||||     Source-Device for destination: DMA-REC
                     |||||||+---- 1: Handshaking off
                     |||||++----- Source-Device
                     ||||+------- 0: if handshaking on and source=DSP-XMIT
                     ||||         1: if source<>DSP-XMIT 
                     ||||         (this modus allows a automatic transfer 
                     ||||         from DSP to memory without errors.)
                     ||||
                     ||||         Source-Device for destination: DSP-REC
                     |||+-------- 1: Handshaking off
                     |++--------- Source-Device
                     +----------- 0: Tristate, disconnect DSP from Multi-
                                     plexer (only if you want to use the 
                                     external SSI-Port)
                                  1: connect DSP with Multiplexer
Source-Device can be:   %00: DMA-PLAY
                        %01: DSP-XMIT (DSP send data)
                        %10: EXT-INP (External Input)
                        %11: A/D-Converter

$FFFF8934 [R/W] :$00 ____3210 ...................... Prescale external Clock
                         ||||
                         ++++----    0: switch to STE-compatible mode
                                  1-15: Clock devided by 256, devided by
                                        prescalevalue+1.
                                  Documentation only allows values between 
                                  0 and 15, but the XBIOS allows values 
                                  between 0 and 255. The upper nibble is
                                  cut by the hardware.  
$FFFF8935 [R/W] :$01 ____3210 ... Prescale internal Clock (25.175 or 32 MHz)
                         ||||
                         ++++---- look above! According to the 
                         ||||     Documentation you can only use the 
                         ||||     following values for the CODEC(A/D- and
                         ||||     D/A-Converter): 0,1,2,3,4,5,7,9,11  
                         0000---- switch to STE-compatible mode
                         0001---- CLK50K  49170 Hz
                         0010---- CLK33K  32780 Hz
                         0011---- CLK25K  24585 Hz
                         0100---- CLK20K  19668 Hz
                         0101---- CLK16K  16390 Hz
                         0110---- CLK14K  14049 Hz (invalid for CODEC)
                         0111---- CLK12K  12292 Hz
                         1000---- CLK11K  10927 Hz (invalid for CODEC)
                         1001---- CLK10K   9834 Hz
                         1010---- CLK09K   8940 Hz (invalid for CODEC)
                         1011---- CLK08K   8195 Hz
                         1100---- CLK07K   7565 Hz (invalid for CODEC)
                         1101---- CLK07K   7024 Hz (invalid for CODEC)
                         1110---- CLK06K   6556 Hz (invalid for CODEC)
                         1111---- CLK06K   6146 HZ (invalid for CODEC)
$FFFF8936 [R/W] :$00 ______10 ......................... Track-Record-Control
                           ||
                           00---- record 1 track
                           01---- record 2 tracks
                           10---- record 3 tracks
                           11---- record 4 tracks
$FFFF8937 [R/W] :$03 ______10 .................... CODEC-Hardwareadder-Input 
                           ||                      (ADDRIN-register)
                           ||       Source-input of the 16-bit-hardwareadder
                           ||
                           |+---- 1: input from A/D-Converter
                           +----- 1: input from Multiplexer
NOTE: The CODEC-Hardwareadder-Input connects the D/A-Converter with the 
      multiplexer or the A/D-Converter. It is also possible to connect both.
      In this case the 16-bit-Hardwareadder mix the two signals.

$FFFF8938 [R/W] :$03 ______10 .......................... A/D-Converter-Input
                           ||                            (ADCINPUT-register)
                           |+---- 0: input from right mic-channel
                           |      1: input from right PSG-channel
                           +----- 0: input from left mic-channel
                                  1: input from left PSG-channel
$FFFF8939 [R/W] :$88 76543210 ..... Channel-Input-Amplifier in +1.5 dB steps
                     ||||||||       (GAIN-register)
                     ||||||||
                     ||||++++---- 0-15: Gain right channel (RTGAIN) 
                     ++++-------- 0-15: Gain of left channel (LTGAIN)
$FFFF893A [R/W] :$07 ____3210 . Channel-Output-Amplifier in -1.5 dB-steps Hi
                         ||||   (ATTEN-register)
                         ||||
                         ++++---- 0-15: Attenuation of feft channal(LTATTEN)
$FFFF893B [R/W] :$70 7654____ ........................................... Lo
                     ||||
                     ++++------- 0-15: Attenuation of right channel(RTATTEN)
$FFFF893C [R/W] :$64 ______10 .............................. CODEC-Status Hi
                           ||
                           |+---- 1: right channel-overflow
                           +----- 1: left channel-overflow
$FFFF893D [R/W] :$00 7654____ .............................. CODEC-Status Lo
                     ||||
                     |||+------ ?
                     ||+------- ?
                     |+-------- ?
                     +--------- ?
$FFFF893E [R/W] :$81 not accessed
$FFFF893F [R/W] :$00 by the XBIOS
$FFFF8940 [R/W] :$00 <===== Hi
$FFFF8941 [R/W] :$00 _____210 ..............................GPx-Dataportpath
                          |||
                          +++---- bidirectional Dataportpath of the GP0-
                                  GP2-Pins on the DSP-Connector
                                  0: Pin set to Input (read data from GPx)
                                  1: Pin set to Output (write data to GPx)
                                     (normally %111)
$FFFF8942 [R/W] :$00 <===== Hi 
$FFFF8943 [R/W] :$07 _____210 ................................. GPx-Dataport
                          |||
                          +++---- Input/Output-Data-Bits of the 
                                  GP0-GP2-Pins on the DSP-Connector. This
                                  Pins can be used for userdef. operations.
                               


****************************************************************************
                       C L O C K  -  C H I P  ( T T )
****************************************************************************

$FFFF8960 [R/W] :$DF ******
$FFFF8961 [R/W] :$FF Register Selection
$FFFF8962 [R/W] :$DF ******
$FFFF8963 [R/W] :$FF Data



****************************************************************************
                          B L I T T E R  ( S T E )
****************************************************************************

$FFFF8A00 [R/W] :$FF Halftone RAM $00 Hi
$FFFF8A01 [R/W] :$FF                  Lo
$FFFF8A02 [R/W] :$FF Halftone RAM $01 Hi
$FFFF8A03 [R/W] :$FF                  Lo
$FFFF8A04 [R/W] :$FF Halftone RAM $02 Hi
$FFFF8A05 [R/W] :$FF                  Lo
$FFFF8A06 [R/W] :$FF Halftone RAM $03 Hi
$FFFF8A07 [R/W] :$FF                  Lo
$FFFF8A08 [R/W] :$FF Halftone RAM $04 Hi
$FFFF8A09 [R/W] :$FF                  Lo
$FFFF8A0A [R/W] :$FF Halftone RAM $05 Hi
$FFFF8A0B [R/W] :$FF                  Lo
$FFFF8A0C [R/W] :$FF Halftone RAM $06 Hi
$FFFF8A0D [R/W] :$FF                  Lo
$FFFF8A0E [R/W] :$FF Halftone RAM $07 Hi
$FFFF8A0F [R/W] :$FF                  Lo
$FFFF8A10 [R/W] :$FF Halftone RAM $08 Hi
$FFFF8A11 [R/W] :$FF                  Lo
$FFFF8A12 [R/W] :$FF Halftone RAM $09 Hi
$FFFF8A13 [R/W] :$FF                  Lo
$FFFF8A14 [R/W] :$FF Halftone RAM $0A Hi
$FFFF8A15 [R/W] :$FF                  Lo
$FFFF8A16 [R/W] :$FF Halftone RAM $0B Hi
$FFFF8A17 [R/W] :$FF                  Lo
$FFFF8A18 [R/W] :$FF Halftone RAM $0C Hi
$FFFF8A19 [R/W] :$FF                  Lo
$FFFF8A1A [R/W] :$FF Halftone RAM $0D Hi
$FFFF8A1B [R/W] :$FF                  Lo
$FFFF8A1C [R/W] :$FF Halftone RAM $0E Hi
$FFFF8A1D [R/W] :$FF                  Lo
$FFFF8A1E [R/W] :$FF Halftone RAM $0F Hi
$FFFF8A1F [R/W] :$FF                  Lo
$FFFF8A20 [R/W] :$00 Source-X-Increment Hi
$FFFF8A21 [R/W] :$00                    Lo
$FFFF8A22 [R/W] :$FF Source-Y-Increment Hi
$FFFF8A23 [R/W] :$00                    Lo
$FFFF8A24 [R/W] :$00 ******
$FFFF8A25 [R/W] :$E4 Source-Address Hi
$FFFF8A26 [R/W] :$89                Mi
$FFFF8A27 [R/W] :$6C                Lo
$FFFF8A28 [R/W] :$FF End-Mask 1 Hi
$FFFF8A29 [R/W] :$FF            Lo
$FFFF8A2A [R/W] :$FF End-Mask 2 Hi
$FFFF8A2B [R/W] :$FF            Lo
$FFFF8A2C [R/W] :$FF End-Mask 3 Hi
$FFFF8A2D [R/W] :$FF            Lo
$FFFF8A2E [R/W] :$00 Destination-X-Increment Hi
$FFFF8A2F [R/W] :$04                         Lo
$FFFF8A30 [R/W] :$00 Destination-Y-Increment Hi
$FFFF8A31 [R/W] :$54                         Lo
$FFFF8A32 [R/W] :$00 ******
$FFFF8A33 [R/W] :$3F Destination-Address Hi
$FFFF8A34 [R/W] :$FD                     Mi
$FFFF8A35 [R/W] :$EA                     Lo
$FFFF8A36 [R/W] :$00 X-Count Hi
$FFFF8A37 [R/W] :$14         Lo
$FFFF8A38 [R/W] :$00 Y-Count Hi
$FFFF8A39 [R/W] :$00         Lo
$FFFF8A3A [R/W] :$01 Halftone-Operation
$FFFF8A3B [R/W] :$03 Logic-Operation
$FFFF8A3C [R/W] :$06 Line-Number
$FFFF8A3D [R/W] :$00 Skew
$FFFF8A3E [R/W] :$FF ******
$FFFF8A3F [R/W] :$FF ******



****************************************************************************
S E R I A L  -  C O M M U N I C A T I O N S  -  C O N T R O L L E R  ( T T )
****************************************************************************

$FFFF8C80 [R/W] :$9F ******
$FFFF8C81 [R/W] :$EC Register Selection Channel A
$FFFF8C82 [R/W] :$FF ******
$FFFF8C83 [R/W] :$FF Read / Write Data Channel A
$FFFF8C84 [R/W] :$8F ******
$FFFF8C85 [R/W] :$44 Register Selection Channel B
$FFFF8C86 [R/W] :$FF ******
$FFFF8C87 [R/W] :$FF Read / Write Data Channel B



****************************************************************************
        J O Y S T I C K  /  L I G H T P E N  -  P O R T S  ( S T E )
****************************************************************************

$FFFF9200 [R/W] :$BF Fire-Buttons 1-4 Hi
$FFFF9201 [R/W] :$FF                  Lo
$FFFF9202 [R/W] :$FF Joysticks 1-4 Hi
$FFFF9203 [R/W] :$FF               Lo
$FFFF9210 [R/W] :$8F Position Paddle 0 Hi
$FFFF9211 [R/W] :$FF                   Lo
$FFFF9212 [R/W] :$8F Position Paddle 1 Hi
$FFFF9213 [R/W] :$FF                   Lo
$FFFF9214 [R/W] :$8F Position Paddle 2 Hi
$FFFF9215 [R/W] :$FF                   Lo
$FFFF9216 [R/W] :$8F Position Paddle 3 Hi
$FFFF9217 [R/W] :$FF                   Lo
$FFFF9220 [R/W] :$00 Lightpen X-Position Hi
$FFFF9221 [R/W] :$00                     Lo
$FFFF9222 [R/W] :$00 Lightpen Y-Position Hi
$FFFF9223 [R/W] :$00                     Lo



