NeXT Computers

NeXT Computer, Inc. => NeXTdimension Board => Topic started by: Rooster on April 25, 2006, 12:16:21 am

Title: What is the best Ram upgrade?
Post by: Rooster on April 25, 2006, 12:16:21 am
What kind of RAM should I be looking for to expand to 32meg?
Parity, Non-Parity?
60NS?

Sorry for thre newbie questions but I'd like to load this Dimension card to its peak upgrade.
Title: What is the best Ram upgrade?
Post by: gtnicol on April 25, 2006, 04:15:58 am
4mb 72 pin FPM memory, 80ns or less.

FWIW. I've tried 8mb as well.
Title: What is the best Ram upgrade?
Post by: Andreas on April 25, 2006, 08:24:33 pm
Quote from: "gtnicol"
FWIW. I've tried 8mb as well.


and with this you can expand to 64MB.
Title: What is the best Ram upgrade?
Post by: brams on April 26, 2006, 02:08:43 pm
Quote from: "Andreas"and with this you can expand to 64MB.


I've though about this as mine as 32mb, but does it actually make any difference to anything?
Title: What is the best Ram upgrade?
Post by: gtnicol on April 26, 2006, 08:09:40 pm
My experience has been that it makes some things faster... video display for example.
Title: What is the best Ram upgrade?
Post by: Rooster on May 06, 2006, 06:01:24 pm
Quote from: "gtnicol"4mb 72 pin FPM memory, 80ns or less.

FWIW. I've tried 8mb as well.


Do you have fill all the slots?
or is it possible to say add 4 X 8 meg chips?
Title: What is the best Ram upgrade?
Post by: andreas_g on June 01, 2018, 02:36:40 pm
I have a question that possibly fits here. It concerns emulation and therefore i also posted it here (http://www.nextcomputers.org/forums/viewtopic.php?t=2642&start=1200).

As i read from this thread it is definitely possible to run a NeXTdimension board with 64 MB of RAM. The emulator (Previous) also supports up to 64 MB. But there seems to be a timing problem using that much memory. The power-on memory test of the NeXTdimension takes too long so that the 68k CPU board does not see a ready NeXTdimension board on start-up.

It is not a big problem, but this causes the ROM Monitor and boot animation to not show up on the NeXTdimension screen, even if configured to do so.

So now my question is: Did someone experience this problem also on a real NeXTdimension board with memory sizes beyond 32 MB?
Title: What is the best Ram upgrade?
Post by: chrisrot on June 01, 2018, 08:29:37 pm
My dimension has 48 MB and works without obvious problems.
Title: What is the best Ram upgrade?
Post by: andreas_g on June 01, 2018, 10:48:42 pm
Quote from: "chrisrot"My dimension has 48 MB and works without obvious problems.


Just to be sure: You see the boot screen (animated icon or message log) on the NeXTdimension color screen?
Title: What is the best Ram upgrade?
Post by: chrisrot on June 02, 2018, 11:51:38 am
ok, sorry, I think I misunderstood you.
I see the boot console on the B&w screen. I only get a picture on the dimension after its server is started.
Title: What is the best Ram upgrade?
Post by: andreas_g on June 02, 2018, 12:03:34 pm
Thank you for checking! This is interesting. Do you know how your screens are configured in the multiple screen preferences? Is the login screen icon on the Dimension or on B&W?
Title: What is the best Ram upgrade?
Post by: chrisrot on June 02, 2018, 01:02:07 pm
The login promt is on the dimension screen, on the b&w the boot log remains.
I think i configured it to use only the dimension screen, but i have to check.
btw it's NS3.3
Title: What is the best Ram upgrade?
Post by: andreas_g on June 03, 2018, 08:22:51 am
Very interesting! This matches the behavior on the emulator when using 48 MB of memory (Clarification: In case you set the Dimension to be your main display in the preferences). If I reduce memory on the Dimension to 32 MB or less the boot log is shown on the Dimension screen.
Title: What is the best Ram upgrade?
Post by: chrisrot on June 10, 2018, 08:56:34 am
In preference the dimension is set On, the megapixel is set to off.
When I turn both on the boot screen is still on the b&w display but disapears when the login promt is displayed.
Title: What is the best Ram upgrade?
Post by: andreas_g on June 10, 2018, 09:06:06 am
Thank you for checking! I think this ultimately confirms that there is a timing bug in the ROM causing that Dimension boards with more than 32 MB RAM are not detected by the ROM.
Title: Re: What is the best RAM upgrade?
Post by: gtnicol on May 04, 2019, 04:50:48 pm
I was going through my herd. Here are a few machines with 64MB Dimensions. The Pyros have the normal error code on startup, but otherwise, the Dimension and the motherboards seem to work fine.

(https://live.staticflickr.com/65535/46856474835_b781899111_k.jpg)
(https://live.staticflickr.com/65535/46856473875_9a7e474534_k.jpg)
(https://live.staticflickr.com/65535/46856472985_6369994038_k.jpg)