Difference between revisions of "Peripheral 2 Register"
From SpecNext official Wiki
(core 3.0 changes/refresh) |
(summary enriched) |
||
| Line 3: | Line 3: | ||
|Readable=Yes | |Readable=Yes | ||
|Writable=Yes | |Writable=Yes | ||
| − | |ShortDesc=Enables [[Acceleration]], [[DivMMC]], [[Multiface]], [[Mouse]] and [[AY]] | + | |ShortDesc=Enables [[Acceleration|Acceleration key]], [[DMA|DMA mode]], [[DivMMC]], [[Multiface]], [[Mouse]] and [[AY|AY audio]]. |
}} | }} | ||
{| class="wikitable" | {| class="wikitable" | ||
Revision as of 19:10, 11 December 2019
| Number | $06 |
|---|---|
| Readable | Yes |
| Writable | Yes |
| Short Description | Enables Acceleration key, DMA mode, DivMMC, Multiface, Mouse and AY audio. |
| Bit | Function |
|---|---|
| 7 | Enable turbo mode key "F8", 0 = disabled (1 after Soft-reset) |
| 6 | DMA mode (0 = zxnDMA, 1 = Z80 DMA) (0 after Hard-reset) |
| 5 | Enable "F3" key (50/60 Hz switch) (1 after Soft-reset) (was "Enable Lightpen" in core 2.0) |
| 4 | Enable DivMMC automap and DivMMC NMI by DRIVE button (0 after Hard-reset) |
| 3 | Enable Multiface (1 = enabled) (0 after Hard-reset) |
| 2 | PS/2 mode (primary device: 0 = keyboard, 1 = mouse), exchanges the keyboard/mouse pins on the PS/2 connector (writeable only in config mode) |
| 1-0 | Audio chip mode (%00 = YM, %01 = AY, %1x = Disabled)
(core 3.0) %11 hold all AY in reset |
The bit 7 doesn't prevent SW from setting up turbo mode by writing into CPU Speed Register ($07), it is used only to enable/disable the "F8" key toggle, similarly bit 5 enables "F3" key.
NEW in core 3.0:
bit 5 = enable F3 (50/60 Hz) bit 2 ps2mode only modifiable in config mode chip mode = 11 resets all AY