A curious Ram situation by C=

[melott]

I have an C= 2630 turbo card with 4 megs ram installed.
According to Amiga-Hardware 4 megs is the max ram on this
card ..the card has positions for up to 8 megs..(thats ODD)
Why put the positions on the card if you can't add the full
8 megs ram :-?
I also have an A2091 SCSI card with 2 megs ram installed.
With both cards installed I only show a total of 4 megs
of Fast Ram (should be 6 megs). With just one of the cards
installed the ram shows correctly (either card).
It appears that the 2 megs on the SCSI card and 2 megs of
the ram on the turbo card have the same address so it only
show 2 megs instead of 4 megs. They don't seem to conflict.
It seems odd to me that Commodore would do something like
that. I would think with Auto-Config all ram should config
correctly.

[blobrana]

Perhaps it was because of a conflict with the memory address of the PCMCIA slot…

[melott]

blobrana wrote:
Perhaps it was because of a conflict with the memory address of the PCMCIA slot…

This is an A2000 .... no PCMCIA slot ....

[Tahoe]

Do both cards have the latest ROM version?
I used to have the 2630/2091 combination and did have the full 6MB....

[melott]

Tahoe wrote:
Do both cards have the latest ROM version?
I used to have the 2630/2091 combination and did have the full 6MB....

Yes.. both have the latest roms

[motrucker]

What is your motherboard version? Some of the early mobo's have odd problems. You want to be running at least a 6.0 I must admit I am not familiar with this one though.

[melott]

motrucker wrote:
What is your motherboard version? Some of the early mobo's have odd problems. You want to be running at least a 6.0 I must admit I am not familiar with this one though.

Its a Rev 4.5 MoBo with 3.1 roms.

[glitch]

Hi,

    If I recall, the A2620/2630 had the possibility of different RAM configurations.  It would have been possible to make one revision of the board, and solder on 2/4/6/8 Megs of RAM.  I doubt they sold this many variations.  A 4M configuration would allow the A2088/A2286/A2386 Bridgeboards to map their I/O space inside the Amigas autoconfig memory  at around the 6MB mark, limiting the maximum RAM you could add to the Amiga to 6MB.  So, 4MB on the A2630 and 2MB on the A2091 (a very popular combo as sold by Commodore) and a Bridgeboard installed.

     Other accelerator manufacturers like GVP mapped their RAM higher and avoided the 6M "barrier" imposed by CBM for the bridgeboard.  I suppose CBM would have done the same had they ever released further accelerators, but then the A3000 and A4000 became the flavour of the day...

Good luck!

-G

[DamageX]

I think the original poster was mistaken. If all the RAM chips are present on the A2630 then you have 4MB. If there are empty spots for more chips then you probably have 2MB and that is why it would show 4MB of fast RAM (2MB on A2630 and 2MB on A2091).

Running bustest is one way to identify which RAM is on the A2630 since it will be much faster.

[amigatower]

Totally right..2630 board only supports 4 meg...I have 2 of them fully populated and both are 4 megs