RetroArch needs IPA is a free, open-source and cross-platform front-end for emulators, game engines, video games, media players and other applications. It is the reference implementation of the libretro API, designed to be fast, lightweight, portable and without dependencies. It is licensed under the GNU GPLv3. RetroArch runs programs converted into dynamic libraries called libretro cores. Lakka is the official Linux distribution of RetroArch and the libretro ecosystem. Each game system is implemented as a libretro core, while the frontend RetroArch takes care of inputs and display. This clear separation ensures modularity and centralized configuration. Today's LaunchBox Tutorial shows you how to get the Commodore 64 up and running in LaunchBox! The system is a bit. Quirky however so somethings may not wor.

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C64 Retroarch
Device Name: SuperCPU
Manufacturer: Creative Micro Designs
Release Price: $199
Released: 1996
Discontinued: 2001
Architecture: 8/16-bit
Clock Speed: 20 MHz
Opcodes: Documented 6510 opcodes only
Support Chips: Altera CPLD
ROM: 64Kb SuperCPU DOS
  • Cartridge pass through
  • SuperRAM Card (1–16MB RAM)
  • 'Rocket Socket' header
Installation: External cartridge
License: Proprietary
  • SuperCPU (v1) was buggy
  • SuperCPU (v2) was quickly released a higher capacity CPLD that enabled significantly more optimizations than the first version.

The SuperCPU was released in 1996 by Creative Micro Designs. It is perhaps the best known CPU accelerators for the Commodore 64 and Commodore 128. It was certainly the most compatible accelerator of its day. It distinguished itself in both speed and compatibility.

The first release of the SuperCPU (v1) was buggy and was not fully optimized. This was due to the fact that the first Altera CPLD used by CMD was too small to include all of the necessary optimization logic to ensure a high degree of compatibility.

The second release of the SuperCPU (v2) generally solved these problems. It included a higher capacity Altera CPLD which allowed for more highly optimized logic without exceeding the capabilities of the chip.


Retroarch C64 Android

The SuperCPU was far from the first commercially successful CPU accelerator but it was the most certainly the most ambitious design.

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Technical Details[editedit source]

Retroarch Vice

Important CPU Memory Locations

$D074 (53364)VIC Bank 2/GEOS Optimization (mirror $8000-$BFFF)
$D075 (53365)VIC Bank 1 Optimization (mirror $4000-$7FFF)
$D076 (53366)BASIC Optimization (mirror $0400-$07FF)
$D077 (53367)No Optimization (mirror all memory (v1 default)
$D07A (53370)Software Speed Select - Normal
$D07B (53371)Software Speed Select - Turbo (20 MHz)($079)
$D07E (43374)Hardware Register Enable
$D07F (43375)Hardware Register Disable ($D07D)
$D0B0 (53424)SuperCPU Mode Detect Register
$D0B2 (52426)Bit 7 Hardware Register Enable Flag
$D0B3 (53427)Enhanced Optimization Register (v2 only)
$D0B4 (53428)Optimization Mode Flags (v1 and v2)
$D0B5 (53429)JiffyDOS Switch Flag / CPU Spped Switch Flag
$D0B6 (53430)Processor Emulation Mode Flag (v1 only)
$D0B8 (53432)Software Speed Flag (1=Normal, 0=Turbo)
$D0B8 (53432)Master Speed Flag (1=Normal via any source)
$D0BC (43436)DOS Extension Mode Flag / RAMLink Hardware Registers Flag
$D200-$D2FFSystem RAM (53760-54015)
$D300-$D3FFUser RAM (available for user programs (54016-54271)

Other CPU Accelerators[editedit source]

C64 Emulator Retroarch

  • Turbo Demo Card (TDC)

Links[editedit source]

Wikipedia: SuperCPU
  • Articles:
    • Underneath the Hood of the Super CPU by Jim Brain
    • Super CPU: CMD's New Time Machine Commodore World #17.
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