Re: [Emutos-devel] EmuTOS on A500/PiStorm

[Jo E. S. <jo...@on...>]

On Thu, 2021-06-10 at 17:46 +0200, Christian Zietz wrote:
> 
> I'm not sure what you're referring to by "this version" and not
> supporting the CPU correctly. EmuTOS? If EmuTOS detects the CPU as 

By "this version" I refer to the ancient EmuTOS floppy version I just
described. And by "not supporting the CPU correctly" I refer to the
lack of speed increase compared to the stock A600. I (possibly
incorrectly?) assumed that EmuTOS would have to set up things like
caches during the boot sequence and that this was not done in this very
early version.

> first guess would be as follows: The floppy version of EmuTOS
> obviously
> runs in RAM. Does it maybe run in slow RAM?

Quite possibly. Amiga chip-RAM is very slow.

> Tbh, to me this sounds more like an issue with the PiStorm than with
> EmuTOS.

That's possible, although there are no such issues with AmigaOS. I'm
also experiencing some read-errors in EmuTOS that is not present with
the old floppy-version on the stock A600.

> [1] Since you have the floppy disk working now, may I suggest
> CoreMark
> https://github.com/czietz/coremark/releases/tag/atari_port to measure
> the actual speed. My Atari port runs under EmuTOS on the V4SA;
> 

With 030-emulation it reports a score of 37.17472 iterations/sec. On my
Milan060 it reports 134.453781, and on my 95Mhz CT60e the result is
219.458663. So while the PiStorm is no powerhouse, it's still
considerably faster than my Mega STE which scores 3.97 iterations/sec
:)

Graphics is very slow on the Amiga though, even with PiStorm it's not
noticably faster than on a completely stock ST. I tried to run GEM-Test 
by 2B, but while all the test ran it failed to compute the actual
scores.

Jo Even