Opposite of "C00000 is Fast RAM"?

rhester72 · 19 September 2022, 05:54

Is there any configuration option that would act as the opposite of the "C00000 is Fast RAM" setting, to force 600000+ RAM to operate at slow/bogo/trapdoor RAM speed?

Reasoning: I'm trying to proper simulate the actual performance characteristics of the ICD AdRAM 540, which allowed adding 4MB of slow-fast RAM in the trapdoor slot of the A500. It was (partially) mapped as fast RAM, but had the performance penalty of all trapdoor memory.

Toni Wilen · 22 September 2022, 22:19

Bleh. Sounds like hardware designers should have known that this was a stupid idea..

Anyway, "Slow" flag added to RAM panel. ("Slow" = chip ram timing but not chip ram capable)

EDIT: Advanced chipset "C00000 is Fast RAM" is also gone. It is not needed anymore.

rhester72 · 28 September 2022, 17:48

Thanks!

Oh, ICD knew...but were semi-obsessed at the time with internal-only A500 expansion taken to unholy levels. Not sure any other company managed to cram 6MB into an A500 trapdoor solution. LOL

19 September 2022, 05:54	#1
rhester72 Registered User Join Date: Feb 2008 Location: New York / USA Posts: 167	Opposite of "C00000 is Fast RAM"? Is there any configuration option that would act as the opposite of the "C00000 is Fast RAM" setting, to force 600000+ RAM to operate at slow/bogo/trapdoor RAM speed? Reasoning: I'm trying to proper simulate the actual performance characteristics of the ICD AdRAM 540, which allowed adding 4MB of slow-fast RAM in the trapdoor slot of the A500. It was (partially) mapped as fast RAM, but had the performance penalty of all trapdoor memory.

22 September 2022, 22:19	#2
Toni Wilen WinUAE developer Join Date: Aug 2001 Location: Hämeenlinna/Finland Age: 47 Posts: 25,731	Bleh. Sounds like hardware designers should have known that this was a stupid idea.. Anyway, "Slow" flag added to RAM panel. ("Slow" = chip ram timing but not chip ram capable) EDIT: Advanced chipset "C00000 is Fast RAM" is also gone. It is not needed anymore. Last edited by Toni Wilen; 23 September 2022 at 20:21.

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28 September 2022, 17:48	#3
rhester72 Registered User Join Date: Feb 2008 Location: New York / USA Posts: 167	Thanks! Oh, ICD knew...but were semi-obsessed at the time with internal-only A500 expansion taken to unholy levels. Not sure any other company managed to cram 6MB into an A500 trapdoor solution. LOL

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