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Author Topic: 1 GB Ram in A4000 ?  (Read 2055 times)

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Offline alexh

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Re: 1 GB Ram in A4000 ?
« Reply #14 from previous page: October 03, 2006, 12:36:05 PM »
It is VERY easy to make low latency ZIII DMA boards. However they are not economically viable. Few people have A4000/A3000 compared to A1200. The cost of tooling for the PCB, the time taken to create and verify the schematics, the cost of the tools. You would never make your money back.
 

Offline Piru

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Re: 1 GB Ram in A4000 ?
« Reply #15 on: October 03, 2006, 12:41:24 PM »
AmigaOS itself can address upto 4GB of memory. However, areas above 2GB can confuse applications (signed compare vs unsigned compare), and the OS itself (bit 31 has special meaning at places).

In practice the maximum memory safely addressable is 2GB. The maximum possible memory size can be calculated by substrating the first 16MB and the zorro areas needed for the system operation. The maximum possible memory size should be roughly 1900 MB.

PS. My Peg2 has 1GB of DDR400 memory. :-P
 

Offline Reflex

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Re: 1 GB Ram in A4000 ?
« Reply #16 on: October 03, 2006, 01:28:22 PM »
i have  to tell about my little experience with a great amount of ram...

I have a ultra expanded Amiga 4000 with a lot of ram. It's something like this:

1) 128 MB on the CSPPC
2) 16 MB on the MotherBoard
3) 64 MB on the Fastlane.

Total 208 MB of fastram.

But it's not that usable at all.

I mean, it's nice when I use Fusion beacuse I can give all the ram of a board to the Macintosh emulation, but if I try to run an application hungry of memory, just like ArtEffect, images comes out very very bad, block of colour in the wrong position... the image I get after some work of it is like a Picasso picture...

If I disable the memory on the fastlane everything is OK though.

So I believe that mixing memory is not that good, it's like amigaOS makes a great mess when it tries to handle such a big big amount of memory
 

Offline Piru

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Re: 1 GB Ram in A4000 ?
« Reply #17 on: October 03, 2006, 01:49:27 PM »
@Reflex

AmigaOS has no problem with such amount of memory. Your fastlane has serious issues, obviously.
 

Offline X-ray

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Re: 1 GB Ram in A4000 ?
« Reply #18 on: October 03, 2006, 02:34:11 PM »
@ Reflex

It isn't the mix, it is a problem with one of your boards. I have a mix too and I don't have any problems:

1) 16mb on the mobo
2) 128mb on the Cyberstorm
3) 128mb on a DKB3128 board

272mb, no problem.
 

Offline Kronos

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Re: 1 GB Ram in A4000 ?
« Reply #19 on: October 03, 2006, 04:23:43 PM »
Quote

Piru wrote:
 The maximum possible memory size should be roughly 1900 MB.



Actually it's a  little less, I once calculated 1818MB based on some address-map found in a book about the A3000.

That number inludes 2MB chip and 8MB Z2, but not the "Slow"-mem found in A500/2000 (I think there's space for an additional 1.3MB).
1. Make an announcment.
2. Wait a while.
3. Check if it can actually be done.
4. Wait for someone else to do it.
5. Start working on it while giving out hillarious progress-reports.
6. Deny that you have ever announced it
7. Blame someone else
 

Offline Erol

Re: 1 GB Ram in A4000 ?
« Reply #20 on: October 03, 2006, 07:57:13 PM »
You can if your doing it on a MMU level..

VMM or GigaMem  both provide virtual memory.

 

Offline recidivist

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Re: 1 GB Ram in A4000 ?
« Reply #21 on: October 04, 2006, 12:51:50 AM »
 Why don't people just consider that the people who built and sold the Amiga knew a little of what they were talking about?

 If the official word was 1.76 Gb then accept that until proven otherwise.

 They probably knew of some hardware or OS conflicts and 1.76 is the max that can be reliably used.

 I wish Commodore had set a larger on board max;strange how Macs of the same era addresed so much more memory.Well,at the the II series not the all-in-ones.



 
 

Offline Kronos

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Re: 1 GB Ram in A4000 ?
« Reply #22 on: October 04, 2006, 04:21:26 AM »
How many Macs from 1992 actually had anything close to 2GB ? Remember that at that times RAM-modules over 8MB were considered exotic ...


The problem is that there has never been new Amigas (in the real sense of the word) since 92.
1. Make an announcment.
2. Wait a while.
3. Check if it can actually be done.
4. Wait for someone else to do it.
5. Start working on it while giving out hillarious progress-reports.
6. Deny that you have ever announced it
7. Blame someone else
 

Offline Reflex

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Re: 1 GB Ram in A4000 ?
« Reply #23 on: October 04, 2006, 01:31:52 PM »
I don't think so as it had no working problems as long as I used it alone... that is without any CPU board with memory on it.

Maybe the problem is only between the fastlane and PPC.

At least this was a bit of time ago.
I'm experiencing some problems with the fastlane for other reasons (I mean SCSI controller).

I believe that I have to send it to amiga repair center but memory works fine:-P

 

Offline AmiDude

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Re: 1 GB Ram in A4000 ?
« Reply #24 on: October 05, 2006, 12:52:08 AM »
For what purpose would anyone need 1GB RAM
in his Miggy? Isn't that a little bit excessive?
:-?
 

Offline marcfrick2112

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Re: 1 GB Ram in A4000 ?
« Reply #25 on: October 06, 2006, 06:42:53 AM »
Hmm, maybe 1GB is a bit much for an Amiga...but, depending on the app. you can run out of RAM easily. (I have a single LW scene from a Light-ROM disc that wouldn't even load with less than 128MB, let alone render...) Besides, assuming the cost isn't too high, it's better too have too much RAM than too little :)

(Too bad my 1260 only can handle 256MB, I was trying for at least 1GB, to beat out my {spit} PC !!)
Quote

AmiDude wrote:
For what purpose would anyone need 1GB RAM
in his Miggy? Isn't that a little bit excessive?
:-?
---------------
Marc Frick
---------------
A1200T / \'060, 256MB, CD-R, OS3.9
A4000 w/ WarpEngine / 82MB , OS3.1
A4000 16MB, OS 3.9
A1200 , \'030 / 10MB
A1200 (stock)

CD32 :)

...And a very sick 4000T