When I load a C64 .prg with the Hoxs64 emulator, my .prg loads pretty much instantly.

But when I load the same .prg file with VICE (x64 app.prg) it takes quite a while (depends on memory map, but several seconds even for compact .prgs).

Is it possible to configure VICE to somehow load .prgs faster?

  • 2
    Enable warp mode (Alt + W) while loading?
    – scruss
    Commented May 28, 2018 at 18:57
  • 1
    That could help. But would be nice if this was automatic. But looks like I found a way, will post an answer.
    – Nurpax
    Commented May 28, 2018 at 20:08

1 Answer 1


Setting the AutostartPrgMode to value 1 does exactly what I needed. This will inject the .prg file directly into RAM and basically my app loads instantly.


x64 -autostartprgmode 1 your_program.prg

Need to integrate this into my ST3 x64 invocation.

  • This is awesome! I updating the options in CBM prg Studio so now my programs load instantly! Fyi, you need to pre-append -autostartprgmode 1 to the field Emulator Parameters under Tools > Options > Emulator Control
    – vbguyny
    Commented Jul 22, 2019 at 20:58

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