Subject: Re: Did lunch - and was told ISA != 16+ meg
To: Marc Rassbach <marcbsd@milestonerdl.com>
From: Michael L. VanLoon -- HeadCandy.com <michaelv@HeadCandy.com>
List: current-users
Date: 02/02/1996 07:16:37
>I took outone of the Introl people for lunch today
>(as from Introl.com) and was told that the only way to
>enjoy more than 16 meg of RAM in a NetBSD box was 
>to use ONLY ISA cards.

This is a bit too general...

>The obv. gotja is with my BusLogic SCSI card.
>(an ISA dma card)  

Yes, this will give you problems.

>But will generic VGA/3com 509/generic serial cards
>which are ISA be problematic with over 16 meg of 
>RAM?

It only affects cards that do bus-master DMA (i. e. try to access
memory from their side of the bus).  Video, ethernet and serial cards
to not do bus-master anything, so they are not affected.

If we ever get DMA-capable EIDE drivers, then ISA EIDE boards will be
affected to.  For now, the only cards I know that get bitten by this
are ISA SCSI cards.

If possible, you want to go with PCI, EISA, or VLB, in that order of
preference, based on what your motherboard supports.

-----------------------------------------------------------------------------
  Michael L. VanLoon                                 michaelv@HeadCandy.com
       --<  Free your mind and your machine -- NetBSD free un*x  >--
     NetBSD working ports: 386+PC, Mac 68k, Amiga, HP300, Sun3, Sun4,
                           DEC PMAX (MIPS), DEC Alpha, PC532
     NetBSD ports in progress: VAX, Atari 68k, others...
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