Difference between revisions of "Peripheral 4 Register"
From SpecNext official Wiki
(core 3.0 changes/refresh) |
(core 3.0.5 changes/refresh) |
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|Readable=Yes | |Readable=Yes | ||
|Writable=Yes | |Writable=Yes | ||
| − | |ShortDesc=Sets scanlines, AY mono output, Sprite-id lockstep, | + | |ShortDesc=Sets scanlines, AY mono output, Sprite-id lockstep, reset DivMMC mapram and disable HDMI audio. |
}} | }} | ||
{| class="wikitable" | {| class="wikitable" | ||
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(was "Disables Kempston mouse port ($DF)" in core 2.0) | (was "Disables Kempston mouse port ($DF)" in core 2.0) | ||
|- | |- | ||
| − | | 2 || | + | | 2 || 1 to silence HDMI audio (hard reset = 0) (since core 3.0.5) |
(was "Disables divMMC ports ($E3, $E7, $EB) if set" in core 2.0) | (was "Disables divMMC ports ($E3, $E7, $EB) if set" in core 2.0) | ||
|- | |- | ||
Revision as of 23:13, 4 December 2019
| Number | $09 |
|---|---|
| Readable | Yes |
| Writable | Yes |
| Short Description | Sets scanlines, AY mono output, Sprite-id lockstep, reset DivMMC mapram and disable HDMI audio. |
| 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 (1 = mono, 0 default) |
| 5 | Enables AY0 "mono" output (0 after Hard-reset) |
| 4 | Sprite id lockstep (1 = Sprite port-mirror Index Register ($34) and Sprite Status/Slot Select ($303B / 12347) are in lockstep, 0 default) |
| 3 | 1 to reset mapram bit in DivMMC
(was "Disables Kempston mouse port ($DF)" in core 2.0) |
| 2 | 1 to silence HDMI audio (hard reset = 0) (since core 3.0.5)
(was "Disables divMMC ports ($E3, $E7, $EB) if set" in core 2.0) |
| 1-0 | scanlines weight (0 after Hard-reset):
%00 = scanlines off, %01 = scanlines 75%, %10 = scanlines 50%, %11 = scanlines 25% |