Path: utzoo!utgpu!news-server.csri.toronto.edu!mailrus!uwm.edu!rpi!zaphod.mps.ohio-state.edu!swrinde!ucsd!ucbvax!hplabs!hpfcso!cunniff
From: cunniff@hpfcso.HP.COM (Ross Cunniff)
Newsgroups: comp.sys.amiga.hardware
Subject: Re: Probs adding RAM to A3000
Message-ID: <10870002@hpfcso.HP.COM>
Date: 13 Jul 90 21:12:35 GMT
References: <10870001@hpfcso.HP.COM>
Organization: Hewlett-Packard, Fort Collins, CO, USA
Lines: 29

In article <13170@cbmvax.commodore.com> joe@cbmvax.commodore.com
(Joe O'Hara - Product Assurance) writes:

>The 1MB fast DIPs are Static Column and the 2MB fast ZIPs are Page Mode.
>2.0 includes code to examine the type of fast RAM in the first bank and
>turns on static column mode if appropriate. However, one can't run Page
>Mode RAMs with SC mode on. Your best bet is to move the 1MB fast DIPs
>over to the chip ram area so that your configuration is 2MB chip, 2MB fast.

Aha!  Mystery solved.  This isn't made very clear in the documentation.
It seems to imply that the check is to see whether ALL RAM is Static
Column, which would have worked.

To make a long story short, I moved the DIPs to the chip ram and moved
the ZIPs from bank 2 into bank 0 and everything was happy.  I did find
out one more educational fact about the 3000/2.0, though: 2.0 won't
boot if the backplane is not installed.  Gave me a minor panic when
my system came up with a yellow screen :-)

Thanks to everybody for all the suggestions.  To summarize, if you buy
the cheaper page mode DRAMs, you MUST move the DIPs into chip memory.
If you by static column mode DRAMs, you can keep the DIPs as fast memory
if you want.  For all of you who asked why I wanted to do it this way:
what use is 2MB of chip ram to Lattice C?

				Ross Cunniff
				Hewlett-Packard Colorado Language Lab
				...{ucbvax,hplabs}!hpfcla!cunniff
				cunniff@hpfcso.hp.com