Re: 4 MB limite (was Re: Zip GS and 14MB RAM??)

[pubpc1@library.ucla.edu]

cdouglas@ibs.net (Collin Douglas) wrote:
>In article <3315740E.2893@swbell.net>, rubywand@swbell.net wrote:
>
>>
>>     There have been claims that some 8MB main memory expansion cards 
>>(which employ a kludge to obtain an additional address line) work, kind 
>>of work, sometimes work, etc.. Based upon reports, the extra memory 
>>"works"; but, there are special limitations on using it due to lack of 
>>support by some peripherals and system software. A major drawback of the 
>>8MB expansion is that, for full support, quite a number of changes are 
>>required; yet, it is a dead end. The user gets another 4MB and that's it.
>>
>>
>
>I'm confused.  I've got an OctoRAM board with 8MB RAM and have never had any 
>problems at all.  The system recognizes all 8MB RAM and it is quite usable in 
>every application I own.
>
>What are some of the problems associated with 8MB?  I know that DMA is limited 
>to the first 4MB.  What others are there?


None.  You have to turn off DMA with Apple brand SCSI cards,
but otherwise, the GS supports 8MB of system RAM (plus another
8MB for the RAM disk and ROM disk if you have a RAMkeeper).
Fully supports, if not for the DMA problem.  That's what the
GS manual states as specs and also from personal experience.

All GS/OS programs see the memory, as do many P8 softwares.

-Scott G.