Difference between revisions of "Peripheral 2 Register"

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Revision as of 10:00, 14 April 2019

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 Enable Lightpen (1 = enabled) (0 after PoR or Hard-reset)
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)
1-0 Audio chip mode (%00 = YM, %01 = AY, %1x = Disabled)

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).