Editing SuperCPU and Turbo Accelerators (section)

== The SuperCPU ==

{| class="wikitable styled-table" style="width:75%; text-align:left;"
|+'''CMD SuperCPU'''
! !! 
|-
| Manufacturer || Creative Micro Designs
|-
| Released || 1996
|-
| Discontinued || 2001
|-
| Release price || US$199
|-
| Processor || WDC 65C816S
|-
| Clock || 20 MHz
|-
| Opcodes || Documented 6510 opcodes only
|-
| Support chip || Altera CPLD
|-
| On-card RAM || 128 KB SRAM
|-
| ROM || 64 KB SuperCPU DOS
|-
| Expansion || Cartridge pass-through, SuperRAM Card (1–16 MB), "Rocket Socket" header
|-
| Installation || External, cartridge port
|}
<ref name="c64wiki" />

'''v1 against v2.''' The first SuperCPU was released with an Altera CPLD too small to hold all the compatibility logic CMD wanted, and it was buggy as a result. The second version fitted a higher-capacity CPLD and generally solved the problem. If you are buying one, that is the difference that matters.<ref name="c64wiki" />

=== Register map ===

The SuperCPU is controlled and detected through registers in the $D0xx space. This matters beyond the SuperCPU itself, because later hardware imitates it.<ref name="c64wiki" />

{| class="wikitable styled-table" style="width:90%; text-align:left;"
|+'''SuperCPU registers'''
! Address !! Purpose
|-
| $D074 (53364) || VIC bank 2 / GEOS optimisation (mirror $8000–$BFFF)
|-
| $D075 (53365) || VIC bank 1 optimisation (mirror $4000–$7FFF)
|-
| $D076 (53366) || BASIC optimisation (mirror $0400–$07FF)
|-
| $D077 (53367) || No optimisation — mirror all memory (v1 default)
|-
| $D07A (53370) || Software speed select — normal
|-
| $D07B (53371) || Software speed select — turbo (20 MHz)
|-
| $D07E / $D07F || Hardware register enable / disable
|-
| $D0B0 (53424) || SuperCPU mode detect register
|-
| $D0B3 (53427) || Enhanced optimisation register (v2 only)
|-
| $D0B4 (53428) || Optimisation mode flags (v1 and v2)
|-
| $D0B5 (53429) || JiffyDOS switch flag / CPU speed switch flag
|-
| $D0B6 (53430) || Processor emulation mode flag (v1 only)
|-
| $D0B8 (53432) || Software speed flag / master speed flag
|-
| $D0BC (53436) || DOS extension mode flag / RAMLink hardware registers flag
|-
| $D200–$D2FF || System RAM
|-
| $D300–$D3FF || User RAM, available to user programs
|}