Peripheral 4 Register
From SpecNext official Wiki
Revision as of 01:16, 23 December 2018 by wiki>Ped7g (New features from KS Update #41.)
| Number | $09 |
|---|---|
| Readable | Yes |
| Writable | Yes |
| Short Description | Sets scanlines, disables Kempston and divMMC ports. |
| Bit | Function |
|---|---|
| 7-5 | Makes particular AY "monophonic" (source: KS update #41) |
| 4 | Reserved, must be 0 |
| 3 | Disables Kempston mouse port ($DF) if set |
| 2 | Disables divMMC ports ($E3, $E7, $EB) if set |
| 1-0 | scanlines configuration (0 after a PoR or Hard-reset):
%00 = scanlines off, %01 = scanlines 75%, %10 = scanlines 50%, %11 = scanlines 25% |