Peripheral 2 Register
From SpecNext official Wiki
| Number | $06 |
|---|---|
| Readable | Yes |
| Writable | Yes |
| Short Description | Enables Acceleration, Lightpen, DivMMC, Multiface, Mouse and AY audio. |
| Bit | Function |
|---|---|
| 7 | Enable turbo mode key "F8", 0 = disabled (0 after PoR or Hard-reset) |
| 6 | DMA mode (0 = zxnDMA, 1 = Z80 DMA) (0 after PoR or Hard-reset) |
| 5 | (core 2.0) Enable Lightpen (1 = enabled) (0 after PoR or Hard-reset)
(core 3.0) Enable "F3" key (50/60 Hz switch) |
| 4 | DivMMC automatic paging (1 = enabled) (0 after PoR or Hard-reset) |
| 3 | Enable Multiface (1 = enabled) (0 after PoR or Hard-reset) |
| 2 | PS/2 mode (0 = keyboard, 1 = mouse), exchanges the keyboard/mouse pins on the PS/2 connector (0 after PoR or Hard-reset)
(core 3.0) can be modified only in "config" mode |
| 1-0 | Audio chip mode (%00 = YM, %01 = AY, %1x = Disabled)
(core 3.0) %11 resets all AY (not sure how is that different from %10, TBD) |
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 (core 2.00.24 information).
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