Read pixel value
| OSWord call | Action | Available on: | ||||
|---|---|---|---|---|---|---|
| (dec) | (hex) | BBC | Master | Electron | ||
| 9 | 09 | Read pixel value | x | x | x | |
This routine returns the status of a screen pixel at a given pair of X and Y co-ordinates.
Parameter block
| XY+ | Content |
|---|---|
| 0 | LSB of X coordinate |
| 1 | MSB of X coordinate |
| 2 | LSB of Y coordinate |
| 3 | MSB of Y coordinate |
| 4 | Logical colour at that point |
On exit, XY+4 contains the logical colour at the required point or &FF if the point specified was off the screen.
Last modified October 6, 2021: Move BBC content into subdirectory to allow more bbc content (23080e8)