Hi,

What is the maximum amont of RAM you can put *theorically* in the Pegasos II ? Can we put 2x2 GB or 2x4 GB in the Pegasos II ?

I know MorphOS is limited to 2 GB minus 1 byte. But the Pegasos II can handled 8 GB ?

Not sure what you mean with theorically, but the practical limit as specified by bplan is 2GB.

and afaik, MorphOS is limited to 1.5 gigs of ram, but i haven't tested it...

bye, MarK.

I have a Peg2 tested with 1.5 GB (1 GB + 512 MB) of RAM. MorphOS uses the full 1.5 GB.
But two modules working together is not 100% stable! (Rare random error, with one of the two modules alone will not occur.)

Supposedly also a 2 GB module. But MorphOS can not fully exploited 2GB.

Ok, thanks for your reply. The bPlan's site mention also 2 GB. I can't remember where I have seen "8 GB max".

So I have updated my articles with new value. The Pegasos book will be updated too.

Maybe you've seen it in the Pegasos1 specs. The ArticiaS can (theoretically) handle 8 GB RAM.

Not the Articia but the Discovery II.

Look what Neko has to say.

Well the best way to get a real solid answer is from either:

1. Bplan (email them)

2. Genesi ( i guess matt sealey)

They both have done extensive ram testing and would have more reasonable answers.

Theoretically Pegasos II can have 8 gigabytes of RAM.

Theoretically: 8GB.
Physically: 2GB
But under mos, you will see only 1,5GB. Guess why :D

I don't know why it's limited to 1.5 GB?

I know Amiga OS4.1 can use up to 2GB, but as they're both 32bit OS, shouldn't MorphOS see up to 4GB, including graphics cards etc.

Any chance I'll be able to use the full 2GB on my Powermac in the future?

(note, I've never run out of memory even with only 1GB, so it's a fairly accademic question.)

Daff,
Quote:

I'd say that depends on the size of your case ..... but with proper stacking and 4GB modules you should atleast get 1TB in there.

/me runs

Guys I can say that we can debate about this theoritical limits all day and night. The fact is it all comes down to OF. When we were doing ODW build testing we had machines (well sven did for 1) runnning 2gb with a modified OF IIRC. I have a 1gb stick in my peg2 now.. I would try another if I had one. I also cant find an experimental OF I had from Freescale days.. :(

Even with 2 1GB sticks MorphOS will show 1.5, other err, OSs will use the full 2GB.

What about 4 1GB sticks in a powermac g4?

> I know Amiga OS4.1 can use up to 2GB

https://morph.zone/modules/newbb_plus/viewtopic.php?topic_id=6634&forum=3&start=18

> as they're both 32bit OS, shouldn't MorphOS see up to 4GB

https://morph.zone/modules/newbb_plus/viewtopic.php?forum=11&topic_id=6684&start=51

> When we were doing ODW build testing we had machines (well sven did for 1)
> runnning 2gb with a modified OF IIRC.

"We shipped many ODW with 1GB in each slot. 2GB works and is still working today in many instances."
http://www.powerdeveloper.org/forums/viewtopic.php?p=10082#10082

Doesn't sound to me like a "modified OF" was required.

> What about 4 1GB sticks in a powermac g4?

https://discussions.apple.com/message/5237886#5237886

I've tried more than 2GB in a MDD dual 1.42, and no matter what I put in it only saw 2GB.

Dunno why. Wel, MorphOS 1.5GB, Mac OSX 2GB. he rest was just ignored.

What BBRV/Neko say in the powerdeveloper.org thread, is that Genesi shipped many Pegasos2 systems with 2x 1GB memory modules, but
1) You may need a 2B5 revision board for it to work (the last revision)
2) You may need paired RAM (identical memory sticks, paired by the manufacturer)
3) You may need memory of a certain type. I guess the only way is to try? Genesi used "Kingston kit ram with blue heatspreaders", model number KHX3200AK2/2G

@stephen_robinson

Quote:

I think this is because of the way the Amiga API was designed, which MorphOS mimics for Amiga backwards compatibility reasons, and altering this would affect backwards compatibility in a negative way.

>> I don't know why it's limited to 1.5 GB?

> I think this is because of the way the Amiga API was designed, which
> MorphOS mimics for Amiga backwards compatibility reasons, and altering
> this would affect backwards compatibility in a negative way.

That's the reason why MorphOS cannot use the full 32-bit range (4 GiB) but not the reason why it only sees 1.5 GiB instead of 2 GiB.

Actually it's both:
The Amiga-API sometimes uses signed longs as return codes for structures, meaning 2Billion possible addresses and 2Billion possible error-codes

In the 2GB addressspace you now have to cram everything, RAM, GFX-RAM, PCI-cards and onboard-components. Thats where we loose that last 0.5GB.

andreas


Just so you know there were many OF releases that never saw the light of day after 1.2 OF. (probably more than 3 ) Lets say Of "1.3" had boot tones, color splash screen and more. Bplan did some FORTH programming and updated OF for custom Freescale gfx for Motorola and the first rollout of "odw" . You never heard of that right? Exactly.

Do yourself a favor stick to what YOU know not what you THINK you know.


Thank you

[ Edited by magnetic 17.06.2011 - 02:32 ]

1) You may need a 2B5 revision board for it to work (the last revision)
2) You may need paired RAM (identical memory sticks, paired by the manufacturer)
3) You may need memory of a certain type. I guess the only way is to try? Genesi used "Kingston kit ram with blue heatspreaders", model number KHX3200AK2/2G
,

Ok this is iirc

1) Operative word is "may" with newer OF I think older boards would work

2) Generally yes you want matched pair for timings.

3) This is true but Kingston wasnt the only Ram Genesi used. There were several iterations of "odw" the first version that went to motorolla and other clients/partners had Samsung PC2700 (for timing for whatever reason worked really well no errors)