Peripheral 2 Register
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Revision as of 13:47, 28 January 2019 by wiki>Ped7g (Turbo enable/disable bit does affect only keyboard F8 reading)
| 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 | DAC chip mode (0 = I2S, 1 = JAP) (Only VTrucco board, 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 = AY, %10 = YM, %10 = Disabled) (a typo in documentation, defining %10 twice, I *guess* YM is %01) |
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).