From my blog: http://www.atariancomputing.com/blog/tt ... keitfaster
So I decided to attempt the VME Bus Fix as per Atari's rework procedure. The fix saves 1 clock cycle per transfer so it just might be faster. Before I did that, I took screenshots of two benchmarks:
I have a 2MB Mach 64. Only NVDI 5.03 and Idek's Nova drivers are loaded. Reference is the exact same setup and system sans Mach64. The Mach64 @ 1280x1024x256 colors is pretty much as fast as TT High. That says a lot. The ET4000 is faaar behind.
Here is the same setup after the VME Bus Fix. First result is vs the first screenshot above. The rest are with the same TT High reference.
So the results are pretty conclusive and somewhat expected. Wasn't expecting huge differences but discernable gains. Average results are not affected that much but looking at single tests the gains are 1-3% faster. This is with gfx card. I don't know how it saturates the VME bus. Which is why I tried 16bit color as well. I haven't installed Lightning yet, I wonder what speed differences we would see with USB file transfer.
TT VME Bus Fix - Does it really make it faster?
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Re: TT VME Bus Fix - Does it really make it faster?
Very interesting. I have a 2mb Mach64 as well, so I might run a comparison bench.
Re: TT VME Bus Fix - Does it really make it faster?
what is that "VME Bus Fix"?
Lynx I / Mega ST 1 / 7800 / Portfolio / Lynx II / Jaguar / TT030 / Mega STe / 800 XL / 1040 STe / Falcon030 / 65 XE / 520 STm / SM124 / SC1435
DDD HDD / AT Speed C16 / TF536 / SDrive / PAK68/3 / Lynx Multi Card / LDW Super 2000 / XCA12 / SkunkBoard / CosmosEx / SatanDisk / UltraSatan / USB Floppy Drive Emulator / Eiffel / SIO2PC / Crazy Dots / PAM Net
http://260ste.atari.org
DDD HDD / AT Speed C16 / TF536 / SDrive / PAK68/3 / Lynx Multi Card / LDW Super 2000 / XCA12 / SkunkBoard / CosmosEx / SatanDisk / UltraSatan / USB Floppy Drive Emulator / Eiffel / SIO2PC / Crazy Dots / PAM Net
http://260ste.atari.org
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- Posts: 444
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Re: TT VME Bus Fix - Does it really make it faster?
It is an Atari issued rework procedure, one of several over the years to keep older TTs up to date as newer revisions had them incorporated in the motherboard.
Here is Atari's guide: http://dev-docs.exxosforum.co.uk/TT030_Board_Rework.pdf
Here is my visual guide for REV.C: https://www.exxosforum.co.uk/forum/viewt ... f=31&t=887
and REV.D: https://www.exxosforum.co.uk/forum/viewt ... f=31&t=902
Re: TT VME Bus Fix - Does it really make it faster?
ok thanks
Lynx I / Mega ST 1 / 7800 / Portfolio / Lynx II / Jaguar / TT030 / Mega STe / 800 XL / 1040 STe / Falcon030 / 65 XE / 520 STm / SM124 / SC1435
DDD HDD / AT Speed C16 / TF536 / SDrive / PAK68/3 / Lynx Multi Card / LDW Super 2000 / XCA12 / SkunkBoard / CosmosEx / SatanDisk / UltraSatan / USB Floppy Drive Emulator / Eiffel / SIO2PC / Crazy Dots / PAM Net
http://260ste.atari.org
DDD HDD / AT Speed C16 / TF536 / SDrive / PAK68/3 / Lynx Multi Card / LDW Super 2000 / XCA12 / SkunkBoard / CosmosEx / SatanDisk / UltraSatan / USB Floppy Drive Emulator / Eiffel / SIO2PC / Crazy Dots / PAM Net
http://260ste.atari.org