Peripheral 2 Setting Register: Difference between revisions

Latest revision as of 14:47, 13 October 2025

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)

@@ Line 3: / Line 3: @@
 |Readable=Yes
 |Writable=Yes
-|ShortDesc=Enables [[Acceleration]], [[Lightpen]], [[DivMMC]], [[Multiface]], [[Mouse]] and [[AY]] audio.
+|ShortDesc=Enables [[CPU Speed control|CPU Speed key]], [[DivMMC]], [[Multiface]], [[Mouse]] and [[AY|AY audio]].
 }}
 {| class="wikitable"
 ! Bit !! Function
 |-
-| 7 || Enable turbo mode, 0 = disabled (0 after PoR or Hard-reset)
+| 7 || Enable CPU speed mode key "F8", and F5/F6 expansion bus hotkeys 0 = disabled (1 after Soft-reset)
 |-
-| 6 || DAC chip mode (0 = I2S, 1 = JAP) (Only VTrucco board, 0 after PoR or Hard-reset)
+| 6 || core3.1.2: Divert BEEP-only to internal speaker (hard reset = 0)
+<del>DMA mode (0 = zxnDMA, 1 = Z80 DMA) (0 after Hard-reset)</del>
 |-
-| 5 || 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)
 |-
-| 4 || DivMMC automatic paging (1 = enabled) (0 after PoR or Hard-reset)
+| 4 || Enable DivMMC NMI by DRIVE button (0 after Hard-reset)
 |-
-| 3 || Enable Multiface (1 = enabled) (0 after PoR or Hard-reset)
+| 3 || Enable multiface NMI by M1 button (hard reset = 0)
 |-
-| 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)
 |-
-| 1-0 || Audio chip mode (%00 = AY, %10 = YM, %10 = Disabled) (a typo in documentation, defining %10 twice, I *guess* YM is %01)
+| 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 {{NextRegNo|$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)