Peripheral 2 Register

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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 Turbo Control 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