Peripheral 2 Setting Register

Number	TBRegisterNumber::$06
Readable	TBRegisterReadable::Yes
Writable	TBRegisterWritable::Yes
Short Description	[[ShortDesc::Enables CPU Speed key, DivMMC, Multiface, Mouse and AY audio.]]

Bit	Function
7	Enable CPU speed mode key "F8", and F5/F6 expansion bus hotkeys 0 = disabled (1 after Soft-reset)
6	core3.1.2: Divert BEEP-only to internal speaker (hard reset = 0) 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 NMI by DRIVE button (0 after Hard-reset)
3	Enable multiface NMI by M1 button (hard reset = 0)
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, %10 = ZXN-8950, %11 = Hold all AY in reset) (core 3.0) %11 hold all AY in reset

The bit 7 doesn't prevent SW from setting up different CPU speed by writing into {{#ask: TBRegisterNumber::$07 }} ($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

NEW in core 3.1.2:

 bit 6 = BEEP-only into internal speaker (DMA does use two I/O ports now)