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From: koren@hpfelg.HP.COM (Steve Koren)
Newsgroups: comp.sys.amiga.hardware
Subject: Hurricane 2800 doesn't like 16 bit fast ram?
Message-ID: <16530001@hpfelg.HP.COM>
Date: 3 Oct 90 14:45:55 GMT
Organization: HP Elec. Design Div. -FtCollins
Lines: 30


I recently bought a (used) Hurricane 2800 '030 card.  It seems to work
great with one exception; I was wondering if anyone else had noticed this
exception.

The board itself comes with 4 meg of 32 bit ram.  This, in addition to
my 1 meg of 16 bit chip ram gives 5 meg.  In this configuration, all
works great.

I also have a 2 meg card of 16 bit fast ram, made by MicroBotics.  Normally
this ram autoconfigures.  If I set it up that way with the hurricane card,
I expect to have 7 total meg composed of 1 meg of 16 bit chip ram, 2 meg of
16 bit fast ram, and 4 meg of 32 bit fast ram.

However, it doesn't work.  More specifically, the MicroBotics memory
autoconfigures OK, but when accessed, it returns seemingly random values
(or at least, not the values which were written there).  With the '030
disconnected, the MicroBotics memory works fine.

Someplace in the Hurricane 2800 docs, they mention a "bug in AmigaDos"
which they claim prevents '030 data and instruction caches from working
correctly with normal fast ram.  So far I haven't tested this (as their
configuration program turns on caches by itself, and since the ram has
already autoconfigured itself, its too late - system crash).  Is there
any way I can use my other 2 meg with the '030 card?  Do any other
'030 cards exhibit the same problems?

Thanks to anyone who can offer some insight...

    - steve (koren@hpfela.HP.COM)