NextPort:$BF3B
From SpecNext Wiki
| Port Number | $BF3B |
|---|---|
| Decimal | |
| Short desc. | ULA+ Register |
| Bit Mask | |
| Readable | ? |
| Writable | Yes |
| Subsystem |
bits 7:6 Select register group
- 00 = palette group
- 01 = mode group
bits 5:0 Writes data
- if bits 7:6 = 00, selects an index 0-63 in the ula+ palette
- if bits 7:6 = 01, ignored (changing timex video mode is incompatible with existing ULA+ software)