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for ARM devices
OS_Byte 160 VDU Variable Numbers
Programmer's Reference Manuals
» Part 15 – SWI Calls
» OS
» OS_Byte
» OS_Byte 160
» VDU Variable Numbers
VDU Variable Numbers
| # | Value |
|---|---|
| 0 | LSB of graphics window left column (ec) |
| 1 | MSB of graphics window left column (ic) |
| 2 | LSB of graphics window bottom row (ic) |
| 3 | MSB of graphics window bottom row (ic) |
| 4 | LSB of graphics window right column (ic) |
| 5 | MSB of graphics window right column (ic) |
| 6 | LSB of graphics window top row (ic) |
| 7 | MSB of graphics window top row (ic) |
| 8 | text window left column |
| 9 | text window bottom row |
| 10 | text window right column |
| 11 | text window top row |
| 12 | LSB of graphics origin x coordinate (ec) |
| 13 | MSB of graphics origin x coordinate (ec) |
| 14 | LSB of graphics origin y coordinate (ec) |
| 15 | MSB of graphics origin y coordinate (ec) |
Notes
These VDU variable numbers are different to the those of OS_ReadVDUVariables?, and that it can read many more variables. It should be used in preference to OS_Byte 160.
ic: Internal Co-ordinates. The origin is always the bottom left of the screen. One unit is one pixel wide and one pixel high.
ec: External Co-ordinates. A pixel is (1 \<\< XEigFactor) units wide and (1 \<\< YEigFactor) units high, where XEigFactor and YEigFactor are VDU variables.
See also
- OS_Byte
- OS_Byte 160
- OS_ReadVDUVariables?