Difference between revisions of "Peripheral 4 Register"
From SpecNext official Wiki
(Core 2.00.22 changes, and forum knowledge from Jim Bagley distilled.) |
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|Readable=Yes | |Readable=Yes | ||
|Writable=Yes | |Writable=Yes | ||
| − | |ShortDesc=Sets scanlines, disables Kempston and divMMC ports. | + | |ShortDesc=Sets scanlines, AY mono output, disables Kempston and divMMC ports. |
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{| class="wikitable" | {| class="wikitable" | ||
Revision as of 13:11, 24 December 2018
| Number | $09 |
|---|---|
| Readable | Yes |
| Writable | Yes |
| Short Description | Sets scanlines, AY mono output, disables Kempston and divMMC ports. |
| Bit | Function |
|---|---|
| 7 | Enables AY2 "mono" output (A+B+C is sent to both R and L channels, makes it a bit louder than stereo mode). |
| 6 | Enables AY1 "mono" output |
| 5 | Enables AY0 "mono" output |
| 4 | Reserved, must be 0 |
| 3 | Disables Kempston mouse port ($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% |