Custom CPU and clock frequency

[MagerValp]

Hi,
is it possible to configure a custom CPU and clock frequency with FS-UAE? I'd like to configure an A600 or A500+ with a 28 MHz 68000 or 68020, and an A2000 with 68030.

[mfilos]

As I wanted to gief FS-UAE a spin... I wanted to do the same with emulating my A600 with 030 but couldn't find it as well.
I guess since it's targeted for gaming experience, these custom configs aren't supported by default in the GUI (maybe they can be enabled in configs) so better stick with WinUAE.

[MagerValp]

I'm on a Mac so I'm afraid WinUAE isn't an option.

[jbl007]

That's where a winuae install on wine becomes handy: spy on its configuration.
With cycle exact emulation enabled (accuracy=1) it should be possible to set the cpu-multiplier. For example:

[config]
amiga_model=A500+
uae_cpu_model=68020
uae_cpu_multiplier=8

Settings for multiplier:
8=28 MHz
4=14 MHz
2=7 MHz
1=3.5 MHz (???)
I don't know if this really works with fs-uae, but according the messages in the logfile it does.

But remember:

$ grep void Log/FS-UAE.log.txt 
WARNING: custom uae_* options used! Your warranty is now void! ;)

[MagerValp]

Excellent, uae_* did the trick! This gives me something that's pretty close to an A600 with ACA620:

amiga_model = A600
kickstart_file = Kickstart v2.05 rev 37.350 (1992)(Commodore)(A600HD)[!].rom
# ACA620 Accelerator
fast_memory = 4096
slow_memory = 1024
uae_cpu_frequency = 16
uae_cpu_speed = real
uae_cpu_throttle = 0.0
uae_cpu_type = 68ec020
uae_cpu_compatible = true
uae_cpu_24bit_addressing = true
uae_cpu_cycle_exact = true
uae_blitter_cycle_exact = true
uae_cycle_exact = true