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Path: utzoo!utgpu!watmath!att!tut.cis.ohio-state.edu!pt.cs.cmu.edu!cadre!km
From: km@cadre.dsl.PITTSBURGH.EDU (Ken Mitchum)
Newsgroups: comp.sys.ibm.pc,comp.unix.questions,comp.unix.wizards,comp.unix.xenix,comp.unix.microport,comp.unix.i386
Subject: Re: scsi rll trade off questions?
Keywords: scsi rll hard disk compatability
Message-ID: <2966@cadre.dsl.PITTSBURGH.EDU>
Date: 10 Jul 89 22:51:55 GMT
References: <14978@ut-emx.UUCP> <15064@ut-emx.UUCP>
Reply-To: km@cadre.dsl.pitt.edu (Ken Mitchum)
Organization: Decision Systems Lab., Univ. of Pittsburgh, PA.
Lines: 11

>Item 5 in the list above is the current biggest concern to me.  If the
>ST0x is not a DMA device what happens when I try to run software like
>zmodem downloads that want to do serial and disk I/O simultaneously?

The ST01 does support interrupts, so there is no need for the processor
to "wait" for a transfer to take place. DMA was probably left off the
card 1) to save money and 2) because there is no effective way in a DOS
environment to take advantage of it.

 Ken Mitchum
 km@cadre.dsl.pitt.edu