Difference between revisions of "Peripheral 2 Register"

Revision as of 12:53, 11 November 2019

Number	$06
Readable	Yes
Writable	Yes
Short Description	Enables Acceleration, 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

@@ Line 8: / Line 8: @@
 ! Bit !! Function
 |-
-| 7 || Enable turbo mode key "F8", 0 = disabled (0 after PoR or Hard-reset)
+| 7 || Enable turbo mode key "F8", 0 = disabled (1 after Soft-reset)
 |-
-| 6 || DMA mode (0 = zxnDMA, 1 = Z80 DMA) (0 after PoR or Hard-reset)
+| 6 || DMA mode (0 = zxnDMA, 1 = Z80 DMA) (0 after Hard-reset)
 |-
-| 5 || (core 2.0) Enable Lightpen (1 = enabled) (0 after PoR or Hard-reset)
+| 5 || Enable "F3" key (50/60 Hz switch) (1 after Soft-reset) (was "Enable Lightpen" in core 2.0)
-(core 3.0) Enable "F3" key (50/60 Hz switch)
 |-
-| 4 || DivMMC automatic paging (1 = enabled) (0 after PoR or Hard-reset)
+| 4 || Enable DivMMC automap and DivMMC NMI by DRIVE button (0 after Hard-reset)
 |-
-| 3 || Enable Multiface (1 = enabled) (0 after PoR or Hard-reset)
+| 3 || Enable Multiface (1 = enabled) (0 after 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)
+| 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)
-(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)
+(core 3.0) %11 hold all AY in reset
 |}
-The bit 7 doesn't prevent SW from setting up turbo mode by writing into {{NextRegNo|$07}}, it is used only to enable/disable the "F8" key toggle (core 2.00.24 information).
+The bit 7 doesn't prevent SW from setting up turbo mode by writing into {{NextRegNo|$07}}, it is used only to enable/disable the "F8" key toggle, similarly bit 5 enables "F3" key.
 '''NEW in core 3.0:'''