Copyright(C) 1994,1995,1996,1997 Terumasa KODAKA, Takeshi KONO
■Multimedia architecture control
Subject PC-98GS
Explanation o PC-98GS is equipped with its own graphics system. This graphics system is named Multimedia Architecture.
o Whether the multimedia architecture can be used is indicated by 0000:0458h bit 6 in the system common area.
o The I/O ports used by the multimedia architecture are as follows.
--------------+-------+-----+-----------------------------------------
I/O address | Width | R/W | Content
--------------+-------+-----+-----------------------------------------
A46Eh | BYTE | R | Various status acquisition
A560h | BYTE | R/W | SGP work RAM access mode
A562h | BYTE | R/W | Unknown
A564h | BYTE | R/W | Address projected to VRAM window #0
A566h | BYTE | R/W | Address projected to VRAM window #1
A568h | BYTE | | Unknown
A56Ah | BYTE | | Unknown
A56Ch | BYTE | R | SGP status
A56Eh | BYTE | R/W | Unknown (SGP related)
A660h | BYTE | R/W | Synchronous mode setting
A662h | BYTE | R/W | Screen mode setting
A664h | BYTE | R/W | Screen horizontal expansion mode specification
A666h | BYTE | R/W | Screen vertical expansion mode specification
A668h | BYTE | R | Status acquisition
A760h | BYTE | R/W | Pallet number specification
A762h | BYTE | R/W | Brightness setting (green)
A764h | BYTE | R/W | Brightness setting (red)
A766h | BYTE | R/W | Brightness setting (blue)
A76Ah | BYTE | | Unknown
A76Ch | BYTE | R/W | Palette set selection
A76Eh | BYTE | R/W | AT bit specification
A860h | WORD | R/W | Compose specification
A862h | WORD | R/W | Compose specification
A864h | BYTE | R/W | Transparent color mode setting
A866h | BYTE | R/W | Frame #0 Transparent color palette number
A868h | BYTE | R/W | Frame #1 Transparent color palette number
A86Ah | BYTE | R/W | Frame #2 transparent color palette setting
A86Ch | BYTE | R/W | Frame #3 transparent color palette setting
A960h | BYTE | R/W | Transparent color mode specification for video screen
A962h | WORD | R/W | Blue component upper level specification
A964h | WORD | R/W | Blue component lower level specification
A966h | WORD | R/W | Red component upper level specification
A968h | WORD | R/W | Red component lower level specification
A96Ah | WORD | R/W | Green component upper level specification
A96Ch | WORD | R/W | Green component lower level specification
AA60h | BYTE | R/W | Mask slot designation
AA62h | WORD | R/W | X coordinate (dot) of mask area start position (left end)
AA64h | WORD | R/W | X coordinate (dot) of mask area end position (right end)
AA66h | BYTE | R/W | Y coordinate (dot) of mask area start position (top end)
AA68h | BYTE | R/W | Y coordinate (dot) of mask area end position (bottom edge)
AA6Ch | BYTE | R/W | Blue component of background color
AA6Dh | BYTE | R/W | Red component of background color
AA6Eh | BYTE | R/W | Green component of background color
AB60h | BYTE | R/W | Top priority screen blue fade level
AB64h | BYTE | R/W | Top priority screen red fade level
AB68h | BYTE | R/W | Top priority screen green fade level
AB62h | BYTE | R/W | 2nd priority screen blue fade level
AB66h | BYTE | R/W | 2nd priority screen red fade level
AB6Ah | BYTE | R/W | 2nd priority screen green fade level
AB6Ch | BYTE | R/W | Display color quantization state
AB6Dh | BYTE | | Unknown
AB6Eh | BYTE | R/W | Special effect specification
AB6Fh | BYTE | R/W | Unknown
AC60h | BYTE | R/W | Effect range color mode specification
AC62h | BYTE | R/W | Effect range color specification
AC64h | BYTE | R/W | Top priority screen designation
AC65h | BYTE | R/W | Next priority screen specification
AC6Eh | BYTE | | Unknown
AD60h | WORD | R/W | X-OFFSET of frame #0
AD62h | WORD | R/W | Y-OFFSET of frame #0
AD64h | WORD | R/W | Display start line of frame #0
AD66h | WORD | R/W | Number of display lines for frame #0
AD68h | WORD | R/W | X-OFFSET of frame #1
AD6Ah | WORD | R/W | Y-OFFSET of frame #1
AD6Ch | WORD | R/W | Frame #1 display start line
AD6Eh | WORD | R/W | Number of display lines for frame #1
AE60h | WORD | R/W | X-OFFSET of frame #2
AE62h | WORD | R/W | Y-OFFSET of frame #2
AE64h | WORD | R/W | Frame #2 display start line
AE66h | WORD | R/W | Number of display lines for frame #2
AE68h | WORD | R/W | X-OFFSET of frame #3
AE6Ah | WORD | R/W | Y-OFFSET of frame #3
AE6Ch | WORD | R/W | Frame #3 display start line
AE6Eh | WORD | R/W | Number of display lines for frame #3
AF60～AF66h | BYTE | | Unknown
AF68h | BYTE | | Unknown
AF6C～AF6Fh | BYTE | | Unknown
--------------+-------+-----+-----------------------------------------
Relation 0000:0458h bit 6
I/O A46Eh
Name Get various statuses
Undocumented
Function
[READ]
bit 7:B bank EMS
1=EMS mapping state (OUT 43Fh,22h)
0=VRAM mapping state (OUT 43Fh,20h)
bit 6:GS graphic mode state
1=GS graphic ON state (OUT 6Ah,0Fh)
0=GS graphics OFF state (OUT 6Ah, 0Eh)
bit 5: Extended graphics mode state
1=256 color mode state (OUT 6Ah, 21h)
0=16 color mode state (OUT 6Ah, 20h)
bit 4 to 0: Not available Use
[WRITE] Unknown
Explanation o Indicates the status of the current graphic mode, etc.
Relation I/O 006Ah - 0Eh,0Fh
I/O 006Ah - 20h,21h
I/O 043Fh - 20h,22h
I/O A560h
Name SGP Work RAM Access Mode
Undocumented
Function
[READ/WRITE]
bit 7: SGP work RAM access
1=permitted
0=prohibited bit
6 to 2: Unused (?)
bit 1,0: SGP work RAM bank
00b=BANK#0
01b=BANK#1
10b=BANK#2
11b=BANK#3
Explanation o Control access to SGP work RAM
Relation INT 1Fh - Function 00h
INT 1Fh - Function 01h A800:0000~7FFFh
I/O A562h
Name Unknown
Undocumented
Function [READ/WRITE]
bit 7～0:Unknown
Explanation o Details unknown
I/O A564h,A566h
Name Window #0,#1 bank number setting
Function
--------------+-------+-----+------------------------------------
I/O address | Width | R/W | Content
--------------+-------+-----+------------------------------------
A564h | BYTE | R/W | Address projected to VRAM window #0
A566h | BYTE | R/W | Address projected to VRAM window #1
--------------+-------+-----+------------------------------------
Explanation o Set the VRAM address to be projected to B0000~B7FFFh, B8000~BFFFFh in 4KB units.
Relation B000:0000~7FFFh B800:0000~7FFFh
I/O A568h,A56Ah
Name Unknown
Undocumented
Function
Unknown
Explanation o Details unknown
I/O A56Ch
Name SGP Status
Undocumented
Function
[READ]
bit 7～1:Unknown
bit 0:BUSY
1=BUSY
0=READY
Explanation o Get the status of SGP(SuperGraphicProcessor).
o Details unknown
Relation I/O A56Eh
I/O A56Eh
Name Unknown
Undocumented
Function
[READ/WRITE]
bit 7～0:Unknown
Explanation o Details unknown (SGP related)
Relation I/O A56Ch
I/O A660h
Name Synchronization mode setting
Undocumented
Function
[READ/WRITE]
bit 7: Digitize
1=Yes
0=No
bit 6,5: Not used?
bit 4: Unknown
bit 3: Unknown
bit 2～0: Unknown
Explanation o Configure various settings related to synchronization signals. Details unknown.
I/O A662h
Name Screen mode settings (pixel size and resolution settings for each frame)
Undocumented
Function
[READ/WRITE]
bit 7: 16.77 million color frame buffer mode
1=Special frame buffer
0=Normal frame buffer
bit 6: Not used
bit 5: Number of frame #2 colors
1=65536 colors
0=256 colors
bit 4: Frame #0,#1 line number setting
1=640x512x1
0=640x256x2
bit 3: Not used?
bit 2: Frame #0,1 and #2,3 concatenation mode
1=Concatenate frames #0 to #3
0=Frame #0,1 and #2,3
bit 1: Number of colors in frame #0
1=16M/65536 colors
0=256 colors
bit 0: Number of lines in frame #0, #1 setting
1=640x512x1
0=640x256x2
Explanation o Set the number of colors, resolution, etc. for each frame.
I/O A664h
Name Screen horizontal expansion mode specification
Undocumented
Function
[READ/WRITE]
bit 3: FRAME#3 2x horizontal enlargement
bit 2: FRAME#2 2x horizontal enlargement
bit 1: FRAME#1 2x horizontal enlargement
bit 0: FRAME#0 2x horizontal enlargement
1=Yes
0=not
Function o Specify the frame to display twice horizontally enlarged.
Relation I/O A666h
I/O A666h
Name Screen vertical expansion mode specification
Undocumented
Function
[READ/WRITE]
bit 3: FRAME#3 2x vertical enlargement
bit 2: FRAME#2 2x vertical enlargement
bit 1: FRAME#1 2x vertical enlargement
bit 0: FRAME#0 2x vertical enlargement
1=Yes
0=not
Explanation o Specify the frame to display twice vertically enlarged.
Relation I/O A664h
I/O A668h
Name Get Status
Undocumented
Function
[READ]
bit 7～5: Unknown
bit 4: VSYNC
1=Generating
0=Not occurring
bit 3～0: Unknown
Explanation o Details unknown
Relation
I/O A760h, A762h, A764h, A766h
Name Palette Settings
Undocumented
Function
------------------------+-------+-----+----------------------------
I/O address | Width | R/W | Content
------------------------+-------+-----+----------------------------
A760h | BYTE | R/W | Pallet number specification
A762h | BYTE | R/W | Brightness setting (green)
A764h | BYTE | R/W | Brightness setting (red)
A766h | BYTE | R/W | Brightness setting (blue)
------------------------+-------+-----+----------------------------
Explanation o Set the palette. Valid only on 256 color screens.
o After specifying the palette number with I/O A760h, set its brightness.
Relation A76Ch
I/O A76Ah
Name Unknown
Undocumented
Function Unknown
Explanation o Details unknown
I/O A76Ch
Name Palette set selection
Undocumented
Function
[READ/WRITE]
bit 7 to 5: Unused?
bit 4: Palette mode selection
1=24bit palette mode
0=16bit palette mode
bit 3,2: Unused?
bit 1,0: Palette set selection
11b=Palette set #3 selection
10b=Palette set #2 selection
01b=Palette set #1 selection
00b=Palette set #0 selection
Explanation o Specify the palette set to be set with I/O ports A760h, A762h, A764h, and A766h.
o When using a 24-bit palette, you cannot use more than 3 frames.
Relation I/O A760h
I/O A76Eh
Name AT bit specification
Undocumented
Function
[READ/WRITE]
bit 7~3: Unused (set to 0)
bit 2~0: AT bit setting
100b=AT bit is set to G0
010b=AT bit is set to R0
001b=AT bit is set to B0
Any other combination is prohibited.
Explanation o In PC-98GS, when 65536 pixels are used, 5 bits are allocated to the brightness of blue, red, and green.
The remaining 1 bit (AT bit) can be set as the least significant bit of either blue, red, or green.
Set where to allocate the AT bit for this I/O port.
I/O A860h
Name Compose specification
Undocumented
Function
[READ/WRITE]
bit 15: Screen display for priority #3
1=Yes
0=No
bit 14-12: Screen specification for priority #3
110b=Video screen
101b=Screen 3
100b=Screen 2
011b=Screen 1
010b=Screen 0
001b=Current screen
000b=Not specified
bit 11: Screen display of priority #2
1=Yes
0=No
bit 10~8: Screen specification of priority #2
110b=Video screen
101b=Screen 3
100b=Screen 2
011b=Screen 1
010b=Screen 0
001b=Current screen
000b=Not specified
bit 7: Screen display with priority #1
1=Yes
0=No
bit 6 to 4: Screen specification with priority #1
110b=Video screen
101b=Screen 3
100b=Screen 2
011b=Screen 1
010b=Screen 0
001b=Current screen
000b=Not specified
bit 3: Screen display with priority #0
1=Yes
0=No
bit 2～0: Screen specification with priority #0
110b=Video screen
101b=Screen 3
100b=Screen 2
011b=Screen 1
010b=Screen 0
001b=Current screen
000b=Not specified
Explanation o Specify the source to be displayed for each priority on the screen.
Relation I/O A862h
I/O A862h
Name Compose specification
Undocumented
Function
[READ/WRITE]
bit 15 to 9: Not used
bit 8: Text top priority flag
1=Text has top priority
0=Text is integrated with graphics
bit 7: Screen display with priority #5
1=Yes
0=No
bit 6 to 4: Screen specification for priority #5
110b=Video screen
101b=Screen 3 100b=Screen 2
011b=Screen 1
010b=Screen 0
001b=Current screen
000b=Not specified
bit 3: Screen display for priority #4
1=Yes
0=No
Bit 2~0: Screen specification for priority #4
110b=Video screen
101b=Screen 3
100b=Screen 2
011b=Screen 1
010b=Screen 0
001b=Current screen 000b=No specification
Explanation o Specify the source to be displayed for each priority on the screen.
o If you specify the bit8 text highest priority flag, 98 graphics screens will always be given the highest priority.
Relation I/O A860h
I/O A864h
Name Transparent color mode setting
Undocumented
Function
[READ/WRITE]
bit 7,6: Frame #3 transparent color mode specification
bit 5,4: Frame #2 transparent color mode specification
bit 3,2: Frame #1 transparent color mode specification
bit 1,0: Frame #0 Transparent color mode specification
11b=Other than setting value
10b=Setting value only
01b=Palette specification larger than setting value
00b=Less than setting value
Explanation o Set which transparent color mode to use for each frame.
o Transparent colors are only available on 256 color screens.
Relation I/O A866h
I/O A866h, A868h, A86Ah
Name Transparent color palette settings
Undocumented
Function
------------+-------+-----+-------------------------------------------
I/O address | Width | R/W | Content
------------+-------+-----+-------------------------------------------
A866h | BYTE | R/W | Frame #0 Transparent color palette number
A868h | BYTE | R/W | Frame #1 Transparent color palette number
A86Ah | BYTE | R/W | Frame #2 transparent color palette setting
A86Ch | BYTE | R/W | Frame #3 transparent color palette setting
------------+-------+-----+-------------------------------------------
Explanation o Specify the palette number used to specify transparent color for each frame.
Relation I/O A864h
I/O A960h
Name Transparent color mode specification for video screen
Undocumented
Function
[READ/WRITE]
bit 7～2: Not used
bit 1: Frame #2 transparent color flag
bit 0: Frame #0 transparent color flag
0=Transparent color available
1=No transparent color
Explanation o Set the transparency color for the video screen.
Relation I/O A962～A96Dh
I/O A962h
Name Blue component upper level specification
Undocumented
Function
[READ/WRITE]
bit 15 to 8: Specify the blue upper level of frame #2
bit 7 to 0: Specify the blue upper level of frame #0
Explanation o Specify the upper limit of the brightness signal (blue) of the image displayed in frames #0 and 2.
Relation I/O A964h
I/O A964h
Name Blue component lower level specification
Undocumented
Function
[READ/WRITE]
bit 15 to 8: Specify the blue lower level of frame #2
bit 7 to 0: Specify the blue lower level of frame #0
Explanation o Specify the lower limit of the luminance signal (blue) of the image displayed in frames #0 and 2.
Relation I/O A962h
I/O A966h
Name Red component upper level specification
Undocumented
Function
[READ/WRITE]
bit 15 to 8: Specifies the red upper level of frame #2
bit 7 to 0: Specifies the red upper level of frame #0
Explanation o Specify the upper limit of the brightness signal (red) of the image displayed in frames #0 and 2.
Relation I/O A968h
I/O A968h
Name Red component lower level specification
Undocumented
Function
[READ/WRITE]
bit 15 to 8: Specify the red lower level of frame #2
bit 7 to 0: Specify the red lower level of frame #0
Explanation o Specify the lower limit of the brightness signal (red) of the image displayed in frames #0 and 2.
Relation I/O A966h
I/O A96Ah
Name Green component upper level specification
Undocumented
Function
[READ/WRITE]
bit 15 to 8: Specify the green upper level of frame #2
bit 7 to 0: Specify the green upper level of frame #0
Explanation o Specify the upper limit of the brightness signal (green) of the image displayed in frames #0 and 2.
Relation I/O A96Ch
I/O A96Ch
Name Green component lower level specification Undocumented
Function
[READ/WRITE]
bit 15 to 8: Specify the green lower level of frame #2
Bit 7 to 0: Specify the green lower level of frame #0
Explanation o Specify the lower limit of the luminance signal (green) of the image displayed in frames #0 and 2.
Relation I/O A96Ah
I/O AA60h
Name Mask slot specification
Undocumented
Function
[READ/WRITE]
bit 7: Mask setting
1=Mask enabled
0=Mask prohibited
bit 6: Mask area specification
1=Mask outside the area
0=Mask inside area
bit 5: 5th slot specification
bit 4: 4th slot specification
bit 3: 3rd slot specification
bit 2: 2nd slot specification
bit 1: 1st slot specification
bit 0: 0th slot specification
1=Mask
0=Do not mask
Explanation o Set the mask insertion position and type.
Relation I/O AA22~AA69h
I/O AA62h, AA64h, AA66h, AA68h
Name Mask position specification
Undocumented
Function
------------+-------+-----+-----------------------------------------------------------
I/O address | Width | R/W | Content
------------+-------+-----+-----------------------------------------------------------
AA62h | WORD | R/W | X coordinate (dot) of mask area start position (left end)
AA64h | WORD | R/W | X coordinate (dot) of mask area end position (right end)
AA66h | BYTE | R/W | Y coordinate (dot) of mask area start position (top end)
AA68h | BYTE | R/W | Y coordinate (dot) of mask area end position (bottom edge)
------------+-------+-----+-----------------------------------------------------------
Explanation o Specify the position of the mask area.
I/O AA6Ch, AA6Dh, AA6Eh
Name Background color specification
Undocumented
Function
------------+-------+-----+-----------------------------------------------------------
I/O address | Width | R/W | Content
------------+-------+-----+-----------------------------------------------------------
AA6Ch | BYTE | R/W | Blue component of background color
AA6Dh | BYTE | R/W | Red component of background color
AA6Eh | BYTE | R/W | Green component of background color
------------+-------+-----+-----------------------------------------------------------
Explanation o Specify the background color
I/O AB60h, AB64h, AB68h
Name Top priority screen fade level
Undocumented
Function
------------+-------+-----+-----------------------------------------------------------
I/O address | Width | R/W | Content
------------+-------+-----+-----------------------------------------------------------
AB60h | BYTE | R/W | Top priority screen blue fade level
AB64h | BYTE | R/W | Top priority screen red fade level
AB68h | BYTE | R/W | Top priority screen green fade level
------------+-------+-----+-----------------------------------------------------------
Explanation o Set the fade level of the top priority screen.
I/O AB62h, AB66h, AB6Ah
Name 2nd priority screen fade level
Undocumented
Function
------------+-------+-----+-----------------------------------------------------------
I/O address | Width | R/W | Content
------------+-------+-----+-----------------------------------------------------------
AB62h | BYTE | R/W | 2nd priority screen blue fade level
AB66h | BYTE | R/W | 2nd priority screen red fade level
AB6Ah | BYTE | R/W | 2nd priority screen green fade level
------------+-------+-----+-----------------------------------------------------------
Explanation o Set the fade level of the top priority screen.
I/O AB6Ch
Name Display color quantization state
Undocumented
Function
[READ/WRITE]
bit 7～0:Unknown
Explanation o Details unknown
I/O AB6Dh
Name Unknown
Undocumented
Function
Unknown
Explanation o Details unknown
I/O AB6Eh
Name Special effect specification
Undocumented
Function
[READ/WRITE]
bit 7～0: Special effect mode
0000xxxxb=Special effects prohibited
0011xxxxb=Transparent composition
0101xxxxb=Additive composition
0110xxxxb=Filter processing
0111xxxxb=Transparent processing
01000000b=All bits OFF (display becomes black)
01000001b=not(A or B)
01000010b=not(A) and B
01000011b=not(A)
01000100b=A and not(B)
01000101b=not(B)
01000110b=A xor B
01000111b=not(A and B)
01001000b=A and B
01001001b=not(A xor B)
01001010b=B
01001011b=not(A) or B
01001100b=A
01001101b=not(B) or A
01001110b=A or B
01001111b=All bits ON (display becomes white)
Explanation o Specify special effects such as logical operations between screens
Relation I/O AB6Fh
I/O AB6Fh
Name Unknown
Undocumented
Function
[READ/WRITE]
bit 7～2: Unused?
bit 1: Special effect start
bit 0: Fade related
00b=Unknown
01b=Unknown
10b=Unknown
11b=Fade in progress
Explanation o Details unknown
Relation I/O AB6Eh
I/O AC60h
Name Effect range color mode specification
Undocumented
Function
[READ/WRITE]
bit 7～0: Effect range color mode specification
00h=Less than the set color
01h=Above the set color
02h=Only the set color
03h=Other than the set color
Explanation o Specify the color range for special effects.
o Valid only when the highest priority frame specified by I/O port AC64h is 8 bits/pixel.
Relation I/O AB6Eh
I/O AB6Fh
I/O AC62h
I/O AC64h
I/O AC62h
Name Effect range color specification
Undocumented
Function
[READ/WRITE]
bit 7～0: Effect range color
Explanation o Set the color used to specify the color range for special effects.
o Valid only when the highest priority frame specified by I/O port AC64h is 8 bits/pixel.
Relation I/O AC60h
I/O AC64h
I/O AC64h
Name Top priority screen designation
Undocumented
Function
[READ/WRITE]
bit 7: Special effect flag
1=Special effect set
0=Special effect not set
bit 6~2: Not used? bit 1,0: Top priority screen designation
11b=Frame #3
10b=Frame #2
01b=Frame #1
00b=Frame #0
Function o Specify the screen for setting special effects
Relation I/O AC60h
I/O AC62h
I/O AC65h
I/O AC65h
Name Next priority screen specification
Undocumented
Function
[READ/WRITE]
bit 7: Unused (set to 0)
bit 6: Background surface
bit 5: Video screen
bit 4: 98 Graphics screen
bit 3: Frame 3
bit 2: Frame 2
bit 1: Frame 1
bit 0: Frame 0
0=Do not use
1=Use
Explanation o Specify the next priority screen.
Relation I/O AC64h
I/O AC6Eh
Name Unknown
Undocumented
Function
Unknown
Explanation o Details unknown
I/O AD60h, AD62h, AD64h, AD66h
Name Frame #0 display position setting
Undocumented
Function
------------+-------+-----+-------------------------------------
I/O address | Width | R/W | Content
------------+-------+-----+-------------------------------------
AD60h | WORD | R/W | X-OFFSET of frame #0
AD62h | WORD | R/W | Y-OFFSET of frame #0
AD64h | WORD | R/W | Display start line of frame #0
AD66h | WORD | R/W | Number of display lines for frame #0
------------+-------+-----+-------------------------------------
Explanation o Set the display position of frame #0
I/O AD68h, AD6Ah, AD6Ch, AD6Eh
Name Frame #1 display position setting
Undocumented
Function
------------+-------+-----+-------------------------------------
I/O address | Width | R/W | Content
------------+-------+-----+-------------------------------------
AD68h | WORD | R/W | X-OFFSET of frame #1
AD6Ah | WORD | R/W | Y-OFFSET of frame #1
AD6Ch | WORD | R/W | Frame #1 display start line
AD6Eh | WORD | R/W | Number of display lines for frame #1
------------+-------+-----+-------------------------------------
Explanation o Set the display position of frame #1
I/O AE60h, AE62h, AE64h, AE66h
Name Frame #2 display position setting
Undocumented
Function
------------+-------+-----+-------------------------------------
I/O address | Width | R/W | Content
------------+-------+-----+-------------------------------------
AE60h | WORD | R/W | X-OFFSET of frame #2
AE62h | WORD | R/W | Y-OFFSET of frame #2
AE64h | WORD | R/W | Frame #2 display start line
AE66h | WORD | R/W | Number of display lines for frame #2
------------+-------+-----+-------------------------------------
Explanation o Set the display position of frame #2
I/O AE68h, AE6Ah, AE6Ch, AE6Eh
Name Frame #3 display position setting
Undocumented
Function
------------+-------+-----+-------------------------------------
I/O address | Width | R/W | Content
------------+-------+-----+-------------------------------------
AE68h | WORD | R/W | X-OFFSET of frame #3
AE6Ah | WORD | R/W | Y-OFFSET of frame #3
AE6Ch | WORD | R/W | Frame #3 display start line
AE6Eh | WORD | R/W | Number of display lines for frame #3
------------+-------+-----+-------------------------------------
Explanation o Set the display position of frame #3
I/O AF60~AF66h,AF68h,AF6C~AF6Fh
Name Unknown
Undocumented
Function
Unknown
Explanation o Details unknown