CommodoreSam continues his deep dive into the TurboMaster V3 from Corei64, focusing on viewer questions about compatibility with the Commodore 128 and various port expanders. This updated version of the original accelerator offers significant improvements, and this discussion sheds light on how it operates under different setups.
From Prototype to Production Model
Previously, Sam showcased a prototype of the TurboMaster V3, which featured a plastic case and a basic prototype board. Now, he presents the final production model, which boasts an aluminum case with stainless steel hardware, gold-plated edge connectors, and high-quality screen printing. Thomas Christoph of Corei64 and his team have refined this reproduction, not just duplicating the original but upgrading it where possible.
Upgraded Features for Modern Use
One of the key upgrades is the SRAM, which now supports both the original RAM and modern equivalents available from Mouser. Similarly, the CPU has been enhanced, allowing users to choose between the original 4MHz 65C02P4 and the newly produced WDC 65C02. The presence of fake chips on the market makes this flexibility especially valuable.
The Master Adapter has also been redesigned. Previously, a jumper wire was needed between the CPU and adapter, but now signals pass through the edge connector, making installation cleaner and more reliable.
Running the TurboMaster V3 on a Commodore 128
Many viewers were curious about how the TurboMaster V3 functions on a Commodore 128. Since the accelerator only works in 64 mode, specific booting steps must be followed:
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- Start with the TurboMaster disabled.
- Boot into 64 mode by holding the Commodore key while powering on or by typing
GO 64. - Once at the C64 screen, enable the TurboMaster.
If enabled too soon, the 128’s self-check process can prevent the system from booting properly. Additionally, using the reset button requires disabling the TurboMaster first and then re-enabling it after the reset cycle is complete.
Using Port Expanders and Cartridges
Sam also tested compatibility with expanders and other cartridges. A key takeaway is that the Master Adapter is strictly for RAM expanders, supporting GeoRAM, NeoRAM, and REU units. It does not function as a general-purpose port expander.
When using a standard port expander, devices like NeoRAM and Kung Fu Flash work without issue, as long as the TurboMaster is disabled when necessary. However, certain cartridges, like the Ultimate II+, conflict when both are enabled at the same time. The Ultimate II+ can be used alongside the TurboMaster only if the accelerator is turned off before booting.
For users interested in BBS access, the TurboMaster V3 works fine with the Link232 Wi-Fi adapter, as well as similar SwiftLink-style devices. While it doesn’t speed up internet connections, it does enhance overall system responsiveness.
Improved ROM Options
Another upgrade in the V3 is the inclusion of selectable ROMs. By default, it boots into a JiffyDOS-compatible ROM, but users can switch to a standard ROM when needed. This flexibility is useful for programs that may not work well with JiffyDOS but benefit from the 4MHz acceleration.
Conclusion
The TurboMaster V3 is a faithful and improved reproduction of the original, offering both authenticity and modern compatibility. While it requires careful configuration on the Commodore 128, it functions well with proper setup. The ability to use current SRAM and CPU options ensures that more users can enjoy this powerful accelerator without relying on scarce vintage components.
For those interested in fast BASIC programming or software development, the TurboMaster V3 opens up new possibilities. As more software emerges with support for this accelerator, it will become even more valuable to Commodore 64 enthusiasts.
