CDC Read Ahead Buffer

[John Boteler]

>From article <7100007 at adaptex>, by neese at adaptex.UUCP:
> 
> The CDC Wren IV and above have read ahead capability, but it is
> turned off by default, ...
> The read ahead buffer can be enabled via the SCSI mode sense/select
> commands for these drives.  The mode page is 38H and the location in the
> page is byte 2 bit 4.  Of course the header of the page is 14 bytes
> long so the actual byte location is byte 15.  The page length is 14
> bytes.

I'm lost.

> I have writen an extensive piece of software for bit fiddling all the
> mode pages of a SCSI device.  It also includes a low level formatter.
> It does run under MS-DOS and uses menus for poking around in a SCSI
> device. 

Must these command sequences be issued each time the device is acessed?
Powered up? Only once in its life?

I am not intimately familiar with the SCSI spec., so perhaps
pointers to references or a brief discussion would clear
up much of the confusion seen here.

Thanx in advance.

-- 
Bote
uunet!cyclops!csense!bote
{mimsy,sundc}!{prometheus,hqda-ai}!media!cyclops!csense!bote