Re: Need info on Adaptec 1522B adapter

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#402

From: jhlloyd
Date: Tue, 05 Nov 1996 00:00

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In <55l8k2$2h8@news1.pritel.net>, gwelsh@insystems.com (Geoffrey Welsh) writes:
>pjk@aimnet.com (Philip J. Koenig) wrote:
>
>>152x cards and anything with a lower number from Adaptec are all Polled IO.
>>Some of the 152x cards have a jumper to enable "DMA" (not busmastering), but
>>either it doesn't work or the drivers don't support it.
>
>FYI:  I've used a 1522 in DMA mode under BIOS control and with
>ASPI2DOS.SYS installed.  It worked fine for hard drives, but Sytos
>Plus couldn't access the tape drive (a Wangtek QIC-150) reliably.
>
The OS/2 driver for the AIC-6X60 (e.g. AHA-152X) does support DMA mode,
but only on EISA systems. I believe that the DMA throughput on an ISA system,
which does not support B mode transfers will be inferior to programmed I/O.

John

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From: jhlloyd@ix.netcom.com@ix.netcom.com
Subject: Re: Need info on Adaptec 1522B adapter
Date: 1996/11/05
Message-ID: <55npnf$58k@dfw-ixnews8.ix.netcom.com>
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references: <558jbg$q28@cpcug.org> <327ae164.8700834@nntp.ix.netcom.com> <55hvgd$8sv@news.aimnet.com> <55l8k2$2h8@news1.pritel.net>
organization: Netcom
x-netcom-date: Tue Nov 05 10:24:15 AM CST 1996
reply-to: jhlloyd@ix.netcom.com@ix.netcom.com
newsgroups: comp.sys.ibm.pc.hardware.misc,comp.periphs.scsi,comp.os.os2.setup.storage,comp.os.os2.setup.misc,bit.listserv.os2-l

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