NextPort:$FF3B
From SpecNext Wiki
| Port Number | $FF3B |
|---|---|
| Decimal | |
| Short desc. | ULA+ Data |
| Bit Mask | |
| Readable | Yes |
| Writable | Yes |
| Subsystem |
(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+
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.