From: monster@mbear.pub.uu.oz.au (Martin Ozolins)
Newsgroups: comp.sys.amiga.emulations
Subject: Re: 386SX Bridgeboard <-> 1.44 HD MSDOS Disks ?
Date: 11 Apr 92 02:18:11 GMT
X-NewsSoftware: Amiga GRn V1.28 2/25/92 (Beta) by Mike Schwartz

In article <1992Apr3.165112.19924@debbie> harley@debbie (Scott Drysdale) writes:
>In article <monster.039k@mbear.pub.uu.oz.au> monster@mbear.pub.uu.oz.au (Martin Ozolins) writes:
>>More to the point, will the 386SX work properly with Accelerators that use
>>Extended Memory ? ie GVP etc
>>The A2286 does not seem to work properly with them .
>
>there are two requirements for any bridgeboard:
>
>1) 2 meg continuous free space in the zorro II autoconfig space.  this is
>   where the dual port ram and i/o ports for the bridgeboard are mapped.
>
>2) the cpu must not cache data access to the bridgeboard's address space,
>   since the bridgeboard is dual port ram, and what you just read may
>   not be there next time since the other cpu could have changed it.
>   this is only a problem with KS 2.0, since 1.3 disables the cpu's
>   data cache (if any).
>
>to fix the first problem, just make sure you have 2M free in your autoconfig
>space.  ie, if you have an 8M ram card, you have to disable 2M of it.
>
>to fix the second problem, put ENFORCER QUIET before the BindDrivers command
>in your startup-sequence.
>
>i assure you that the 2286 and any other bridgeboard will work fine with all
>sorts of accelerators when the system is set up as described above.  barring,
>of course, that you happen to run into janus 2.0 bugs :)
>

Okay, I have tried all that but it still does not work.

System setup

A2000 Revision 4.4
Kickstart 2.04 in ROM
1 meg chip ram
GVP Series II Combo 22Mhz Accelerator with 5 meg 32bit ram, ROM version 3.12
Quantum 40s harddrive

A2286 Bridgeboard
Intel AboveBoard with 512K ram and serial/par ports
Monitor card
Hard Disk card with Seagate ST-125 20meg drive

The 5meg of 32bit ram is configured as Extended ( GVP design, cannot change it )

Previously the GVP had only 1meg of ram but I had an A2058 ram card with 4meg
of 16bit ram.

With the 16bit ram I did not have any problems at all, I had CACHE on, no Enforcer
running, no errors at all. I could use the AT card all the time.

I sold the A2058 card and bought a 4meg simm for the GVP.
That is the only change that I have made.
I did not change the startup-sequence nor did I change any jumpers

Ever since, I cannot use the AT side and the Amiga side writes corrupted data to
the harddisk. There are no read/write errors, the data is just corrupted.
( even with Cache & Burst all OFF )
You only find out about the corruption when you try to read the file later.

The GVP distributors in Australia have sent a FAX to GVP in the USA and we are waiting
for a reply. I have also sent a message ( via FIDOnet ) to GVP tech support and am
awaiting a reply.

The distributors first said that I had to take the AT card out because it would
not work properly with the GVP Extended Ram, but when I told them that it worked
OK with the 1meg Extended Ram they then decided to fax GVP.

Tanx for the reply.
--

Martin Ozolins :Internet   monster@mbear.pub.uu.oz.au
Victoria       :FIDO       3:633/359.6
Australia      :UUCP       ...!uunet!munnari!yarra!eyrie!phoenix!mbear!monster
Newsgroups: comp.sys.amiga.emulations