Path: utzoo!attcan!uunet!cbmvax!steveb
From: steveb@cbmvax.UUCP (Steve Beats)
Newsgroups: comp.sys.amiga.tech
Subject: Re: Hard disks, DMA vs Non-DMA
Message-ID: <8609@cbmvax.UUCP>
Date: 17 Nov 89 12:03:25 GMT
References: <8911150430.AA24506@jade.berkeley.edu> <14035@grebyn.com> <1284@quintus.UUCP>
Reply-To: steveb@cbmvax.UUCP (Steve Beats)
Organization: Commodore Technology, West Chester, PA
Lines: 15

In article <1284@quintus.UUCP> pds@quintus.UUCP (Peter Schachte) writes:
>In article <14035@grebyn.com> ckp@grebyn.UUCP (Checkpoint Technologies) writes:
>[Severely edited]
>->the A2090's SCSI adapter doesn't properly use the available handshaking to
>->slow the SCSI disk drive down when it's FIFO fills....  fixed on the A2091...
>
>Does the A590 have this problem, or is it more like the A2091 than the
>A2090A?
>-- 
No, the A590 uses the same DMA chip as the A2091, the problem is fixed.  I
have tested the driver with multiple fast SCSI drives and a 4 plane overscanned
hi-res screen.  There is some slowdown, but not much.  Data is certainly
never lost.

	Steve