VDCMAP.TXT

                       8563 VDC REGISTER MAP

 REG#  Bit7  Bit6  Bit5  Bit4  Bit3  Bit2  Bit1  Bit0  Description

  0     HT7   HT6   HT5   HT4   HT3   HT2   HT1   HT0  Horizontal Total
  1     HD7   HD6   HD5   HD4   HD3   HD2   HD1   HD0  Horizontal Displayed
  2     HP7   HP6   HP5   HP4   HP3   HP2   HP1   HP0  Horiz Sync Position
  3     VW3   VW2   VW1   VW0   HW3   HW2   HW1   HW0  Vert/Horiz Sync Width
  4     VT7   VT6   VT5   VT4   VT3   VT2   VT1   VT0  Vertical Total
  5     --    --    --    VA4   VA3   VA2   VA1   VA0  Vert Total Adjust
  6     VD7   VD6   VD5   VD4   VD3   VD2   VD1   VD0  Vertical Displayed
  7     VP7   VP6   VP5   VP4   VP3   VP2   VP1   VP0  Vert Sync Position
  8     --    --    --    --    --    --    IM1   IM0  Interlace Mode
  9     --    --    --   CTV4  CTV3  CTV2  CTV1  CTV0  Char Total Vertical
 10     --    CM1   CM0   CS4   CS3   CS2   CS1   CS0  Cursor Mode/Start Scan
 11     --    --    --    CE4   CE3   CE2   CE1   CE0  Cursor End Scan Line
 12    DS15  DS14  DS13  DS12  DS11  DS10   DS9   DS8  Display Start Addr High
 13     DS7   DS6   DS5   DS4   DS3   DS2   DS1   DS0  Display Start Addr Low
 14    CP15  CP14  CP13  CP12  CP11  CP10   CP9   CP8  Cursor Position High
 15     CP7   CP6   CP5   CP4   CP3   CP2   CP1   CP0  Cursor Position Low
 16    LPV7  LPV6  LPV5  LPV4  LPV3  LPV2  LPV1  LPV0  Light Pen Vertical
 17    LPH7  LPH6  LPH5  LPH4  LPH3  LPH2  LPH1  LPH0  Light Pen Horizontal
 18    UA15  UA14  UA13  UA12  UA11  UA10   UA9   UA8  Update Address High
 19     UA7   UA6   UA5   UA4   UA3   UA2   UA1   UA0  Update Address Low
 20    AA15  AA14  AA13  AA12  AA11  AA10   AA9   AA8  Attribute Start Addr Hi
 21     AA7   AA6   AA5   AA4   AA3   AA2   AA1   AA0  Attribute Start Addr Lo
 22    CTH3  CTH2  CTH1  CTH0  CDH3  CDH2  CDH1  CDH0  Char Tot(h),Dsp(v)
 23     --    --    --   CDV4  CDV3  CDV2  CDV1  CDV0  Char Dsp(v)
 24    COPY   RVS CBRATE VSS4  VSS3  VSS2  VSS1  VSS0  Vert Smooth Scroll
 25    TEXT   ATR  SEMI   DBL  HSS3  HSS2  HSS1  HSS0  Horiz Smooth Scroll
 26     FG3   FG2   FG1   FG0   BG3   BG2   BG1   BG0  Foregrnd/Bkgrnd Color
 27     AI7   AI6   AI5   AI4   AI3   AI2   AI1   AI0  Addr Increment/Row
 28    CB15  CB14  CB13   RAM   --    --    --    --   Character Base Address
 29     --    --    --    UL4   UL3   UL2   UL1   UL0  Underline Scan Line
 30     WC7   WC6   WC5   WC4   WC3   WC2   WC1   WC0  Word Count
 31     DA7   DA6   DA5   DA4   DA3   DA2   DA1   DA0  Data
 32    BA15  BA14  BA13  BA12  BA11  BA10   BA9   BA8  Block Start Addr High
 33     BA7   BA6   BA5   BA4   BA3   BA2   BA1   BA0  Block Start Addr Low
 34    DEB7  DEB6  DEB5  DEB4  DEB3  DEB2  DEB1  DEB0  Display Enable Begin
 35    DEE7  DEE6  DEE5  DEE4  DEE3  DEE2  DEE1  DEE0  Display Enable End
 36     --    --    --    --   DRR3  DRR2  DRR1  DRR0  DRAM Refresh Rate

     Description of MAPPED registers:

 $D600 ->  address (write):    --    --    R5    R4    R3    R2    R1    R0
           status  (read) :  STATUS  LP  VBLANK  --    --    --    --    --

 $D601 ->  data    (r/w)  :    D7    D6    D5    D4    D3    D2    D1    D0

 ATTRIBUTE byte layout        ALT   RVS    UL  FLASH  Red   Grn   Blue  Intens


 Set $D600 to register to read/write. Read/Write register data at $D601.