| From: | Adam Szymczak |
| Date: | 9 May 2000 at 03:57:37 |
| Subject: | Re: Amiga OS 3.5 and Picasso II |
On 08-May-00, David Oakes wrote:
> Derek Lawson said to amigaOS3_5@egroups.com:
>
>> 14mb fast ram on GVP A4008 SCSI controller card
>
> Is there a jumper on the 4008 to put all of its memory into the memory
> area outside the autoconfig area?
This is not possible with the A4008 on an A2000. All memory on the A4008 is
placed in autoconfig (16 bit) space. Also I beleive the 14 MB represents
total fast RAM not the amount of ram on the A4008 - the A4008 has an upper
limit of 8MB. Some clarification from Derek is in order
> The 4008 could be taking all/most
> of the autoconfig memory if it is initialised before the Picasso II,
> which is probably why your Picasso II is only working in segmented
> mode. For the 1 Meg Picasso II, you only require 1 Meg of the
> autoconfig space for it to work in non-segmented mode.
Correct. If the Picasso II requires 1 MB, the total amount of autoconfig (16
bit) RAM on all other cards must not exceed 7 MB, therefore, he would be
limited to 6 MB on A4008 (due to the 2MB increment requirement of the
A4008). It sounds to me that he has some RAM on the Derringer (6 MB
perhaps) and 8 MB on the A4008. If that is the case, he is going to have to
lose 2MB on the A4008.
> Since you don't really want to buy another graphics card, you probably
> aren't willing to buy another accelerator and move all of the memory
> from the 4008 to the new accelerator (I have no idea if the Derringer
> can take the memory - and map it outside autoconfig space - instead
> of having it on the 4008 -> if the Derringer can take all of that
> memory, move it there, it would be better, speedwise, to have it
> attached to the cpu card instead of the scsi adapter anyway).
The Derringer (or any accelerator) cannot remap the A4008 RAM to outside the
autoconfig space. It has always been my understanding that on an A2000
with a ZII, the only RAM that can be configured outside autoconfig space is
RAM located on the accelerator card itself (or extensions thereof as in the
case of the DKB2632).
The Wastebasket Newsletter - http://szymczak.surf.to
------------------------------------------------------------------------
*--- FREE VOICEMAIL FOR YOUR HOME PHONE! ---*
With eVoice Now you can keep in touch with clients, vendors, co-workers,
friends and family ANYTIME, ANYWHERE. Sign Up Today for FREE!
http://click.egroups.com/1/3426/3/_/644178/_/957841229/
------------------------------------------------------------------------