Explain TT030 Memory Upgrades Page Vs Nibble

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Explain TT030 Memory Upgrades Page Vs Nibble

Postby AtariSociety » Fri Apr 01, 2016 11:31 pm

I see a couple Fast Ramm TT memory upgrades for TT030 and one says Page and one says Nibble. What is the difference? Is one better than other? One more compatible than the other? Just curious. TJ

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Re: Explain TT030 Memory Upgrades Page Vs Nibble

Postby Cyprian » Fri Apr 01, 2016 11:37 pm

+1
I also would like to recognize what kind of type simm (nibble/page) I have in my TT Fast Ram card
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Re: Explain TT030 Memory Upgrades Page Vs Nibble

Postby lp » Sat Apr 02, 2016 9:14 am

Nybble mode RAM modules facilitate burst mode filling of the 68030 caches according to the TT030 hardware reference manual. In theory a small speed boost from what I understand. Some fastram boards have a burst mode jumper, I think the Atari made 16mb board had such a jumper. You might have trouble now days finding such simms. I am not sure how to identify them.

I have an 64mb aixTT board in my TT030 which uses 72-pin simms. The documentation claims this: "The memory is managed in such a way that results in speeds faster than the so called "burst mode" on Atari's fast RAM expansion."

http://dev-docs.atariforge.org/files/aixTT_English.pdf

I may have raised more questions. ;)

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Re: Explain TT030 Memory Upgrades Page Vs Nibble

Postby Arne » Sat Apr 02, 2016 10:24 am

Pretty easy question.
Difference FastPageMode and NibbleMode: http://users.ece.gatech.edu/~leehs/ECE6100/papers/introDRAM.pdf
Page 16.
How to identify DRAM types: http://home.arcor.de/kickstart/TKA/Tutorials/Memory/DRAM.html
Difference: For burst mode the nibble mode DRAM has to increase the address for accesses 2 to 4 on its own i.e. the address on the address bus does not change. The 68030 runs this mode.
On the other hand FPM needs the change on the address bus. This has to be provided by the DRAM controller on the TT-RAM add-on card.
Atari's own TT-RAM card needs NibbleMode DRAMs when the burst-mode jumper is set. FPM doesn't work.
In general none seems to be faster than the other. Just different. I haven't found any nibble-mode 30pin SIMMs yet to use with my Atari card.
Probably all other TT-RAM add-on cards use FPM access if they use any kind of bursts. Magnum TT e.g. doesn't.
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Re: Explain TT030 Memory Upgrades Page Vs Nibble

Postby fmh » Sat Apr 02, 2016 12:14 pm

I have Four 1MB 30pin I believe they were called Burst Mode SIMMs. They came from a RAM Board that is long gone and that's what I was told they were and that is what is labeled on the RAM Case. If anybody wants them please contact me.
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Re: Explain TT030 Memory Upgrades Page Vs Nibble

Postby Cyprian » Sat Apr 02, 2016 3:43 pm

lp wrote:Nybble mode RAM modules facilitate burst mode filling of the 68030 caches according to the TT030 hardware reference manual. In theory a small speed boost from what I understand. Some fastram boards have a burst mode jumper, I think the Atari made 16mb board had such a jumper. You might have trouble now days finding such simms. I am not sure how to identify them.

I have an 64mb aixTT board in my TT030 which uses 72-pin simms. The documentation claims this: "The memory is managed in such a way that results in speeds faster than the so called "burst mode" on Atari's fast RAM expansion."


You posted NemBech figures fot the TT sometimes ago. Was it done with that aixTT ?
viewtopic.php?f=27&t=17970
Jaugar / TT030 / Mega STe / 800 XL / 1040 STe / Falcon030 / 65 XE / 520 STm / SM124 / SC1435
SDrive / PAK68/3 / CosmosEx / SatanDisk / UltraSatan / USB Floppy Drive Emulator / Eiffel / SIO2PC / Crazy Dots / PAM Net
Hatari / Aranym / Steem / Saint
http://260ste.appspot.com/

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Re: Explain TT030 Memory Upgrades Page Vs Nibble

Postby lp » Sat Apr 02, 2016 7:49 pm

Cyprian wrote:You posted NemBech figures fot the TT sometimes ago. Was it done with that aixTT ?
viewtopic.php?f=27&t=17970


Of course.

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Re: Explain TT030 Memory Upgrades Page Vs Nibble

Postby Cyprian » Sat Apr 02, 2016 9:33 pm

ok, it's your figures for aixTT ram:

Code: Select all

Linear 32bit read (FastRAM) -> 14.835 MByte/sec (~279%)
Linear 32bit write (FastRAM) -> 12.615 MByte/sec (~195%)
Linear 32bit copy (FastRAM) -> 4,849 MByte/sec (~150%)


and mine Mighty MIC 32:

Code: Select all

Linear 32bit read (FastRAM)  -> 12.566 MByte/sec (~236%)
Linear 32bit write (FastRAM) -> 15.641 MByte/sec (~242%)
Linear 32bit copy (FastRAM)  -> 7.820 MByte/sec (~242%)
Last edited by Cyprian on Sun Apr 03, 2016 9:28 am, edited 2 times in total.
Jaugar / TT030 / Mega STe / 800 XL / 1040 STe / Falcon030 / 65 XE / 520 STm / SM124 / SC1435
SDrive / PAK68/3 / CosmosEx / SatanDisk / UltraSatan / USB Floppy Drive Emulator / Eiffel / SIO2PC / Crazy Dots / PAM Net
Hatari / Aranym / Steem / Saint
http://260ste.appspot.com/

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Re: Explain TT030 Memory Upgrades Page Vs Nibble

Postby lp » Sat Apr 02, 2016 10:27 pm

These figures are in fact mine (aixTT) from the thread you linked:

Code: Select all

Linear 32bit read (FastRAM)  -> 12.566 MByte/sec (~236%)
Linear 32bit write (FastRAM) -> 15.641 MByte/sec (~242%)
Linear 32bit copy (FastRAM)  -> 7.820 MByte/sec (~242%)


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