NextPort:$FF3B
From SpecNext Wiki
| Port Number | $FF3B |
|---|---|
| Decimal | |
| Short desc. | ULA+ Data |
| Bit Mask | |
| Readable | Yes |
| Writable | Yes |
| Subsystem |
For ULA+ i/o ports, all colours are read and written in 8-bit format GGGRRRBB. The 9th blue bit is automatically generated
as the logical OR of the two other blue bits.
(R)
If palette group is selected, the palette value stored at the current ula+ palette index is returned
If the mode group is selected, bit 0 = 1 to indicate ULA+ is enabled
(W)
If the palette group is selected, a palette value is written to the current ula+ palette index
If the mode group is selected, bit 0 = 1 to enable ULA+, 0 to disable ULA+