Re: [hatari-devel] Falcon speed

[laurent.sallafranque@xxxxxxx]

Hi Thomas,

The Falcon emulation is not speed accurate actually, neither cycle accurate..

For example, the current dev version of Racer runs in 3 VBLs under Hatari, whereas it runs in 5 VBLs under my Falcon.
(Hatari is 2 VBLs faster than the real machine).

On my fast computer, hatari is always faster than my real Falcon (anyway I choose cycle exact, prefetch mode, or not).

The Hatari parameters I use for Falcon emulation are :

CPU : winUAE core (hatari_falcon exe)

CPU Type   : 68030
CPU clock  : 16 Mhz
Falcon DSP : Full

CPU parameters :
24 bits addressing    : ON
Prefetch mode, slower : ON
Cycle exact, slower   : ON
Real time clock emu   : ON
Patch Timer_D         : OFF
Blitter emu           : ON
MMU emulation         : OFF (except if you need special apps, but MMU emulation is not cycle accurate at all)

FPU : 68882
More compatible, slower : ON


TOS : 4.04 Fr

Memory : 4 or 14 megs


The cycle exact mode is the one that allows the most programs to work (but if you use the old CPU core (hatari.exe) in Falcon mode, the timings are again different and some rare programs that don't work with the ne core works with the ols one (like the MOAI96 demo by Mikro)

The MMU emulation CPU interprets all the CPU instructions (MMU, CPU, FPU) in 2 cycles, no matter the instruction.


There's still work to do before hatari becomes an accurate Falcon emulator, but it's already useable and quite efficient with many programs ans demos.

Regards

Laurent

 

----- Mail original -----
De: "Thomas Bergstrom" <tb@xxxxxxxxxxxxx>
À: hatari-devel@xxxxxxxxxxxxxxxxxxx
Envoyé: Mercredi 7 Mai 2014 09:05:23
Objet: [hatari-devel] Falcon speed


Hi,

I just wonder if there are any bench figures of Hatari Falcon. I get the 
feeling that if you enable "cycle exact" and "prefetch mode" you get a 
slightly slower Falcon than the real thing. And if you disable those you 
get a CT2 or Nemesis speeded Falcon. Any measurements made?

Just recently joined the list so my appologies if this has been discussed 
alot before...

Br,

/Thomas, New Beat