Editing SuperCPU and Turbo Accelerators (section)

== The SuperCPU's afterlife ==

The register interface outlived the hardware. The '''[[Ultimate 64 Motherboard|Ultimate 64]]''' implements '''SuperCPU-compatible''' software speed-select registers at '''$D07A''' and '''$D07B''' and a '''SuperCPU detect register at $D0BC''', so software written for a SuperCPU can find and drive its turbo.<ref name="u64" />

The U64 is also worth reading for one lesson that applies to every accelerator: on that board, disabling badline timing gives the CPU more slots but '''does not change the BA signal at the cartridge port''', so anything reaching an external device — or a real SID in a socket — is still throttled by badlines. Accelerating the processor never accelerates the bus it has to share.<ref name="u64" />