=> R0 = pointer to input block
R1 = pointer to output block (can be same as R0)
The input block is a list of variable numbers (words) terminated by -1. Each variable is read, and its value is written as a word into the output block.
Note: You can also read the mode variables with this call.
See PRM 1, page 703.
VDU Variables
& # Name Meaning
80 128 GWLCol Graphics Window Lefthand Column (ic)
81 129 GWBRow Bottom Row (ic)
82 130 GWRCol Righthand Column (ic)
83 131 GWTRow Top Row (ic)
84 132 TWLCol Text Window Lefthand Column
85 133 TWBRow Bottom Row
86 134 TWRCol Righthand Column
87 135 TWTRow Top Row
88 136 OrgX x coord of graphics Origin (ec)
89 137 OrgY y coord of graphics Origin (ec)
8A 138 GCsX Graphics Cursor X coord (ec)
8B 139 GCsY Graphics Cursor Y coord (ec)
8C 140 OlderCsX Oldest gr. Cursor X coord (ic)
8D 141 OlderCsY Oldest gr. Cursor Y coord (ic)
8E 142 OldCsX Previous gr. Cursor X coord (ic)
8F 143 OldCsY Previous gr. Cursor Y coord (ic)
90 144 GCsIX Graphics Cursor X coord (ic)
91 145 GCsIY Graphics Cursor Y coord (ic)
92 146 NewPtX New point X coord (ic)
93 147 NewPtY New point Y coord (ic)
94 148 ScreenStart As used by VDU drivers
95 149 DisplayStart As used by display hardware
96 150 TotalScreenSize Memory allocated to screen
97 151 GPLFMD GCOL action for foreground col
98 152 GPLBMD GCOL action for background col
99 153 GFCOL Graphics foreground col
9A 154 GBCOL Graphics background col
9B 155 TForeCol Text foreground col
9C 156 TBackCol Text background col
9D 157 GFTint Graphics foreground tint
9E 158 GBTint Graphics background tint
9F 159 TFTint Text foreground tint
A0 160 TBTint Text background tint
A1 161 MaxMode Highest (standard) mode available
A2 162 GCharSizeX X size of VDU5 chars (pixels)
A3 163 GCharSizeY Y size of VDU5 chars (pixels)
A4 164 GCharSpaceX X spacing of VDU5 chars (pixels)
A5 165 GCharSpaceY Y spacing of VDU5 chars (pixels)
A6 166 HLineAddr Address of horizontal line-draw routine
A7 167 TCharSizeX X size of VDU4 chars (pixels)
A8 168 TCharSizeY Y size of VDU4 chars (pixels)
A9 169 TCharSpaceX X spacing of VDU4 chars (pixels)
AA 170 TCharSpaceY Y spacing of VDU4 chars (pixels)
AB 171 GcolOraEorAddr Addr of colour blocks for current GCOLs
AC 172 VIDCClockSpeed VIDC clock speed in kHz (not RISC OS 2)
AE 174 Left border size (5.07+)
AF 175 Bottom border size (5.07+)
B0 176 Right border size (5.07+)
B1 177 Top border size (5.07+)
C0 192 Current GraphicsV driver number (5.21+)
100 256 WindowWidth Width of text window in chars
101 257 WindowHeight Height of text window in chars
Fast horizontal line draw routine
=> R0 = left x coordinate of end of line
R1 = y coodinade of line
R2 = right x coordinate of end of line
R3 = 0 plot with no action (do nothing!)
1 plot with foreground colour and action
2 invert current screen colour
3 plot with background colour and action
>3 pointer to aligned ECF block
R14 = return address
<= all registers preserved
This must be called in SVC mode. The caller should OS_RemoveCursors before calling, and OS_RestoreCursors afterwards. All coordinates are internal coordinates, and the line is plotted as specified by R3, clipped to the current graphics window.
GCol OR and EOR address
The returned value is a pointer to 3 colour blocks, which are updated whenever GCOL or TINT are issued, or the ECF origin is changed.
Offset Contents
0 Colour block for current foreground colour and action
64 Colour block for current background colour and action
128 Colour block for current background colour with store action
ECF block
This block should be on a 64 byte boundary
Offset Value
0 OR mask for top ECF line
4 EOR mask for top ECF line
8 OR mask for next ECF line
12 EOR mask for next ECF line
56 OR mask for bottom ECF line
60 EOR mask for bottom ECF line
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