Harddisk on M24/AT&T 6300

[Bill Pechter]

In article <1233 at dutesta.UUCP> franky at dutesta.UUCP (Frank W. ten Wolde) writes:
>
>
>I would like to know your (NetLanders) opinion about the following:
>
>I have a AT&T 3600 (actually Olivetti M24) computer and a Seagate
>harddisk (ST251-1) using a Western Digital Controller (WD1002S-WX1).
>For optimum results I must set the interleave factor to 5, which
>slows down the data transfer rate (disk<-->host) to appr. 100K per
>second.
>
>    1. Is there someone out there who has the same problem?
	We all do.  The bus on the 6300 runs at 4mhz which is quite
	slow.  If you use the on-disk controller bios rom you get a very
	slow transfer rate and interleave.
>    2. Is there someone with an AT&T 3600 with a data rate
>       of 170K/s (and a corresponding interleave of 3)?
	I've got a transfer rate of 173k and an interleave of three.
	I'm running a V30 processor, the 1.43 bios rom to control disk 
	parameters and qfresh.  Before qfresh I got an interleave of 4 and
	130k.  My best interleave on the WD Superbios Rom was 6.
	
	Some people have had luck with a program called Ramit that loads the
	disk controller bios into Ram.  I haven't had much luck with it.
	
>    3. Is there someone who can tell me where the problem
>       originates and perhaps how to solve it?
	The bus board's the main problem and it's hardware.  The above 
	workarounds should help.

	I wish someone built an AT&T 16 bit bus disk controller!.

-------------------------------------------------------------------------------
Bill Pechter          {sun!hoptoad,cmcl2!phri}!dasys1!pechter
USnail 103 Governors Road, Lakewood, NJ 08701     AT&T 201-370-0709 Evenings
    "When in doubt, swap it out."           " Anyone want a PDT11/150?"
-------------------------------------------------------------------------------