Turbo mode settings
Turbo control
Option |
Description |
---|---|
Off |
Turbo control is off |
Manual |
Turbo control uses settings from U64. Settings CANNOT be altered with registers. |
U64 Turbo Registers |
Turbo control uses settings from U64. Settings CAN be altered with registers. See Turbo Control registers. |
TurboEnable Bit |
Turbo control uses settings from U64. Settings CAN be altered with registers. See Turbo Control registers. |
CPU Speed
Badline Timing
SuperCPU Detect ($D0BC)
Turbo Control registers
Address |
Description |
---|---|
53297/$D031 |
U64 Turbo Control This register is only available when the Turbo Mode selector is set to ‘U64 Turbo Registers’ or ‘Turbo Enable Bit’. Otherwise it simply reads $FF.
CPU Speed (index)
|
53296/$D030 |
Turbo Enable Bit This register is only available when the Turbo Mode selector is set to ‘Turbo Enable Bit’. Otherwise it simply reads $FF.
|
53370/$D07A |
SuperCPU compatible enable/disable registers This register is only available when the Turbo Mode selector is set to ‘U64 Turbo Registers’ or ‘Turbo Enable Bit’. This register is write only
More information: https://www.c64-wiki.com/wiki/SuperCPU |
53371/$D07B |
SuperCPU compatible enable/disable registers This register is only available when the Turbo Mode selector is set to ‘U64 Turbo Registers’ or ‘Turbo Enable Bit’. This register is write only
More information: https://www.c64-wiki.com/wiki/SuperCPU |
53436/$D0BC |
SuperCPU Detect ($D0BC)
This register is only available when it is separately enabled. This register is read only More information: https://www.c64-wiki.com/wiki/SuperCPU |
Applies to: Ultimate 64
*) Setting are only available on the Ultimate 64, firmware >= 1.33*