Wren IV cache (was: Re: CDC Wren IV = Seagate 4376N)

[Dave Olson]

In <1991Apr11.164521.18541 at searchtech.com> mra at searchtech.com (Michael Almond) writes:

| In article <25883 at hydra.gatech.EDU> ken at dali.gatech.edu (Ken Seefried iii) writes:
| >The Wren IV has a 32K cache on the controller.  The default is for this
| >cache to be off. ... run Roy Neese's SCSICNTL.EXE to turn
| >the cache on.  I don't know of any other way to do this...
| 
| Does anyone know the default for the WREN 6.  We have ours connected to a
| DECsystem 3100 running Ultrix 4.1.  The Installation Manual doesn't mention
| any jumpers to set.

There is no jumper.  It is a bit in mode select page 0x38 (vendor
specific) or page 8 (scsi 2 cache page) depending on which wren VI
drive you have, and/or whether the firmware is a recent revision.

The wren IV is definitely in page 0x38.
--

	Dave Olson

Life would be so much easier if we could just look at the source code.