Bit | Meaning when set |
---|---|
0 | Non-graphics mode |
1 | Teletext mode |
2 | Gap mode |
3 | BBC gap mode ( 3 & 6) |
4 | Hi-res mono mode |
5 | Double height VDU chars |
6 | Hardware scroll never used |
7 | Fully definable 8-bit palette |
The bits in the returning register when using OS_ReadModeVariables provides the information (as shown above) about the current screen mode.