FNX6809 GraphicsVTIOCalls

vtio Get/Set Stat Calls

SS.AScrn

Allocate a bitmap screen

Entry: R$Y = bitmap# (0-2)
       R$X = screentype (0=320x240, 1=320x200)

Exit:  B = A non-zero error code.
      CC = Carry flag clear to indicate success
       X = Starting Page# of bitmap address

SS.DScrn

Display Screen Settings

Set MCR to display text or graphics or both

Entry: R$X = Vicky_MCR Low Byte
       R$Y = Vicky_MCR High Byte

Exit:  Nothing. This just sets the register and updates driver variables

VICKY MASTER CONTROL REGISTER to enable graphics and capabilities

| 7 |   6   |    5   |   4  |    3   |   2   |   1   |   0  |
| X | GAMMA | SPRITE | TILE | BITMAP | GRAPH | OVRLY | TEXT |
|   -----   | FON_SET|FON_OV| MON_SLP| DBL_Y | DBL_X | CLK70|
$FFC0 MASTER_CTRL_REG_L, MASTER_CTRL_REG_H

• vtio graphics constants (in f256.d)
• Constants used in SS.DScrn to set the display screen type

FX_GAM equ %01000000 Gamma Correction On FX_SPR equ %00100000 Sprites On FX_TIL equ %00010000 Tile Maps On FX_BM equ %00001000 Bitmaps On FX_GRF equ %00000100 Graphics Mode On FX_OVR equ %00000010 Overlay Text on Graphics FX_TXT equ %00000001 Text Mode On FT_FSET equ %00100000 Font Set 1 On (0=Font Set 0) FT_FOVR equ %00010000 FG and BG colors displayed when overlay text 0=transparent FT_MON equ %00001000 Turn off monitor sync and sleep monitor FT_DBX equ %00000100 Double-wide text mode characters FT_DBY equ %00000010 Double-high text mode characters FT_CLK70 equ %00000001 70 Hz screen (640x400 txt,320x200 grf) FX_OMIT equ %11111111 Setting for SS.DScrn don't change first byte in MCR FT_OMIT equ %11111111 Setting for SS.DScrn don't change second byte in MCR

SS.PScrn

Position Screen Layers

Set layer to display a screen

Entry: R$X = layer (0-2)
       R$Y = bitmap# (0-2), tilemap (4-6)
       

Exit:  B = A non-zero error code.
      CC = Carry flag clear to indicate success

SS.FScrn

Free a bitmap screen

Entry: R$Y = bitmap# (0-2)

Exit:  B = A non-zero error code.
      CC = Carry flag clear to indicate success

SS.DfPal

Define Palette and populate a CLUT from Memory Module

Entry: R$X = CLUT # (0-3)
       R$Y = pointer to location of data in caller process
       (Caller must load data module)

Exit:  B = A non-zero error code.
      CC = Carry flag clear to indicate success