Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!wuarchive!zaphod.mps.ohio-state.edu!sdd.hp.com!decwrl!ucbvax!DOCKMASTER.NCSC.MIL!TMPLee
From: TMPLee@DOCKMASTER.NCSC.MIL
Newsgroups: comp.sys.apple2
Subject: New HS SCSI card -- worthless for me?
Message-ID: <900807164726.523595@DOCKMASTER.NCSC.MIL>
Date: 7 Aug 90 16:47:00 GMT
Sender: usenet@ucbvax.BERKELEY.EDU
Organization: The Internet
Lines: 18

To make a long story short, the new HS (DMA) SCSI card doesn't seem to
help at all and actually seems about 10% slower than the original.  What
could I be doing wrong?

Here's the long story.  Whe I had to get a new disk drive I decided to
pay the $100 and get a new SCSI card as well.  Being wary of making too
many changes at once, I installed things incrementally.  First I put on
the new disk and got it all re-loaded.  The timings with the ProSel16
timing routines were 11.8 msec linear, 26.7 msec random, 1.7 overhead.
I then used the installer (yes, I did) to put in the new SCSI sw.  Still
worked, roughly same timing.  I then put inthe new SCSI card, but left
DMA turned off because I hadn't yet upgraded my TWGS.  The new TWGS PAL
chip showed up today.  I plugged it in and turned on the DMA.  All
working fine, but the timing is not significantly better:  12.0 msec
linear, 26.18 random, 0.85 overhead.  What gives?  The drive is a CMS
60Meg ("MacStack") from Quality Computers.

TMPLee@dockmaster.ncsc.mil