Difference between revisions of "Peripheral 2 Register"
From SpecNext official Wiki
(core 3.1.3 changes/refresh) |
m (turbo becomes CPU Speed) |
||
| Line 3: | Line 3: | ||
|Readable=Yes | |Readable=Yes | ||
|Writable=Yes | |Writable=Yes | ||
| − | |ShortDesc=Enables [[ | + | |ShortDesc=Enables [[CPU Speed control|CPU Speed key]], [[DivMMC]], [[Multiface]], [[Mouse]] and [[AY|AY audio]]. |
}} | }} | ||
{| class="wikitable" | {| class="wikitable" | ||
! Bit !! Function | ! Bit !! Function | ||
|- | |- | ||
| − | | 7 || Enable | + | | 7 || Enable CPU speed mode key "F8", 0 = disabled (1 after Soft-reset) |
|- | |- | ||
| 6 || core3.1.2: Divert BEEP-only to internal speaker (hard reset = 0) | | 6 || core3.1.2: Divert BEEP-only to internal speaker (hard reset = 0) | ||
| Line 25: | Line 25: | ||
|} | |} | ||
| − | The bit 7 doesn't prevent SW from setting up | + | 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:''' | '''NEW in core 3.0:''' | ||
Latest revision as of 20:41, 20 September 2020
| Number | $06 |
|---|---|
| Readable | Yes |
| Writable | Yes |
| Short Description | Enables CPU Speed key, DivMMC, Multiface, Mouse and AY audio. |
| Bit | Function |
|---|---|
| 7 | Enable CPU speed mode key "F8", 0 = disabled (1 after Soft-reset) |
| 6 | core3.1.2: Divert BEEP-only to internal speaker (hard reset = 0)
|
| 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 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, %1x = Disabled)
(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 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
NEW in core 3.1.2:
bit 6 = BEEP-only into internal speaker (DMA does use two I/O ports now)