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x68000:vidcon_registers [2019/01/06 15:02]
neko68k translated text for VC R2 bit 10
x68000:vidcon_registers [2019/08/27 20:45]
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-=== Overview === 
- 
-^Address^Size^Name^Description^ 
-|$E82000|256.w|--|Graphic palette| 
-|$E82200|256.w|--|Text palette, Sprite+BG palette| 
-|$E82400|1.w|[[vidcon_registers#r0|R0]]|Screen mode| 
-|$E82500|1.w|[[vidcon_registers#r1|R1]]|Priority control| 
-|$E82600|1.w|[[vidcon_registers#r2|R2]]|Layer ON/OFF control/Special priority| 
- 
-Graphic palette($e82000): 
-  The structure of the graphic palette in 16/256 color mode and 65535 color 
- mode. 
- 
-    16 color display: 
-  The first 16 words are used, the value read from the palette  
- is directly output as a color code. 
-   256 color display: 
-  The first 256 words are used, the value read from the palette  
- is directly output as a color code. 
- 65536 color display: 
-  In the text palette and the graphic palette in the 16/256 color 
- display mode, the color codes of one word are arranged by the number 
- of colors. However, in the 65536 color display mode the color codes 
- are divided into upper/lower byte units. Two pairs of 256 bytes that 
- are juxtaposed(upper/lower). When color codes are output, the data of 
- G-VRAM is divided into upper byte and lower byte, each of which is 
- independently determined and then synthesized. 
- 
- PH = Upper byte of G-VRAM data 
- PL = Lower byte 〃 
- CH = Upper byte of color code to be output 
- CL = Lower byte 〃  
- 
- CH = *(unsigned char)($E82002+PH×2-PH&1) 
- CL = *(unsigned char)($E82000+PL×2-PL&1) 
- 
- address size CH CL 
- $E82000 1.b -- PL = $00 
- $E82001 1.b -- PL = $01 
- $E82002 1.b PH = $00 -- 
- $E82003 1.b PH = $01 -- 
- $E82004 1.b -- PL = $02 
- $E82005 1.b -- PL = $03 
- $E82006 1.b PH = $02 -- 
- $E82007 1.b PH = $03 -- 
- …… 
- …… 
- $E821F8 1.b -- PL = $FD 
- $E821F9 1.b -- PL = $FD 
- $E821FA 1.b PH = $FC -- 
- $E821FB 1.b PH = $FD -- 
- $E821FC 1.b -- PL = $FE 
- $E821FD 1.b -- PL = $FF 
- $E821FE 1.b PH = $FE -- 
- $E821FF 1.b PH = $FF -- 
- ($E82000 は PL = $00 の時の CL の値、と読むこと) 
- 
-Text palette($e82200): 
-  The text palette and the sprite+BG palette are 16 rows 
- of 16 words and some are shared. The first palette block, 
- 0, is used by the text palette and the value read from 
- the palette is used as it is. 
- 
-Sprite+BG palette($e82200): 
-  Unlike the text palette, you can use all of the palette 
- blocks 0 to 15. The PCG data contains value of the lower 4 
- bits, the data of the sprite scroll register and the BG 
- data area contains value of the upper 4 bits. 
- 
-=== Detail === 
-<BOOKMARK:r0> 
-VC R0($e82400): 
- bit 15                    3  2 1 0 
-   ┌─────────────────────────┬─┬───┐ 
-   │                         │ │COL│ 
-   └─────────────────────────┴─┴───┘ 
-     SIZ 
- 
- bit 2 SIZ Real screen size 
- %0  :  512× 512 pixels 
- %1  : 1024×1024 pixels 
- bit 1~0 COL Color mode 
- %00 : 16 color 
- %01 : 256 color 
- %10 : Undefined 
- %11 : 65536 color 
- ※Set the same value bits as bits 10~8 of CRTC R20. 
-<BOOKMARK:r1> 
-VC R1($e82500): 
- bit 15  14  13  12  11  10                     0 
-   ┌───┬───┬───┬───┬───┬───┬───┬───┐ 
-   │   │SP │TX │GR │GP3│GP2│GP1│GP0│ 
-   └───┴───┴───┴───┴───┴───┴───┴───┘ 
- 
- bit 13~12 SP Sprite screen priority 
- bit 11~10 TX Text 〃 
- bit  9~ 8 GR Graphic 〃 
- bit  7~ 6 GP3 Page number of the 4th highest priority graphic screen 
- bit  5~ 4 GP2 3rd 〃 
- bit  3~ 2 GP1 2nd 〃 
- bit  1~ 0 GP0 1st 〃 
- 
- ※SP/TX/GR use %00/$01/$10 to increase the screen priority. 
- ※When the graphic screen is 1 page, GP3~GP0 are handled as one set. 
- In case of 2 pages, GP3~GP2/GP1~GP0 are handled as one set each. 
- ※GP3~GP0 setting value 
-   65536 colors : %1110_0100 
-     256 colors : %1110_0100(page 1 < page 0) 
- %0100_1110(page 0 < page 1) 
-      16 colors : %1110_0100(page 3 < page 2 < page 1 < page 0) 
-     … 
- %0001_1011(page 0 < page 1 < page 2 < page 3) 
-<BOOKMARK:r2> 
-VC R2($e82600): 
- bit 15 14  13  12  11   10  9        6             0 
-    ┌──┬──┬───┬────┬───┬───┬───┬───┬────┬───┬───┬───┬───┬───┬───┬───┐ 
-    │YS│AH│VHT│EXON│H/P│B/P│G/G│G/T│BCON│SON│TON│GS4│GS3│GS2│GS1│GS0│ 
-    └──┴──┴───┴────┴───┴───┴───┴───┴────┴───┴───┴───┴───┴───┴───┴───┘ 
- 
- 
- bit 15 YS Video cut 
- (Do not display image even when superimposing) 
- bit 14 AH Translucent: Text palette 0 
- ※Force translucent mode on regardless of EXON, H/P, etc. 
- bit 13 VHT Translucent: Video image (used in Color Image Unit) 
- bit 12 EXON Special priority/Translucent mode enabled 
- bit 11 H/P %0 : Special priority selection 
- %1 : Translucent mode selection 
- bit 10 B/P %0 : Sharp reserved 
- %1 : Enable special priority mode 
- bit  9 G/G Translucent: Graphic screen 
- bit  8 G/T Translucent: text/sprite screen 
- ※Valid only when the priority of the graphics screen is high 
- bit  7 BCON Border color display ON(%1)/OFF(%0) 
- bit  6 SON Sprite screen ON(%1)/OFF(%0) 
- bit  5 TON Text screen ON(%1)/OFF(%0) 
- bit  4 GS4 Graphic screen ON(%1)/OFF(%0) 
- (When the actual screen size is 1024x1024) 
- bit  3~0 GS3~GS0 
- Graphic screen ON(%1)/OFF(%0) 
- (When the actual screen size is 512x512) 
- 
- ※When the graphic screen is one page, all the same values are set for  
- each bit of GS3~GS0. In the case of 2 pages, GS3~GS2/GS1~GS0 are treated 
- as one set each and for each bit of the same set, set the same value to each. 
  
 
 x68000/vidcon_registers.txt · Last modified: 2019/08/27 20:45 (external edit)
 
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