Micropolis 1518 Jumper Settings

From: Jerome Fine <jhfine_at_idirect.com>
Date: Sat Apr 10 23:24:33 1999

>jpero_at_cgocable.net wrote:

> Date sent: Sat, 10 Apr 1999 20:46:00 -0500
> To: jpero_at_cgocable.net
> From: Jeff Kaneko <jeff.pat_at_mindspring.com>
> Subject: Micropolis 1518 Jumper Settings
>
> Hi Jeff and to cc follows:
>
> >
> > Attached is all of the information that I have; I haven't been able to try
> > this because I'm stuck without a capable ESDI controller.
>
> Thanks! But same old hat again, it's same thing you see on the
> blue planet's website.
>
> There are few ESDI controllers that can do 24MHZ and *MUST*
> able to do up to 4096 cylinders. Nice thing about all ESDI
> controllers for Peecees, LBA built right in for greater than 528MB!
>
> > Looks like you should set for 512 bytes/sector, 83 spt, *hard* sectored. I
> > wish I knew that Ultra 12f-24's were so damned rare . . .
>
> Really? What about it and why it's bit rare?

Jerome Fine replies:

I am also using the 12F24 on my PC. I have an Hitachi DK516-15
which I must run in compatibility mode. But otherwise, it seems great.

> And I really beg to anyone on this list to pool their experiences to
> "pull" up the ESDI performance because I'm getting subpar
> performance for a "high" end hd like 1538 with 71 sectors (1518 is
> 83 sectors) both hds should have screamed instead of plodded
> along. About 600KPS out of that 1538, yuk. I got over 800kps on
> that same controller with a Miniscribe 3180E on that paltry 36
> sectors.

I also have problems with using drives with a large number
of sectors/track. On the PDP-11, I have a Sigma RQD11-EC
which runs the Maxtor drives very well, but when I get to
the Hitachi drives with so many sectors, I have a big problem
when there are more than 7 quad slots in the backplane. It
is a BA123 and I have had to cut out the boards I don't
normally use. Any ideas?

Sincerely yours,

Jerome Fine
RT-11/TSX-PLUS User/Addict
Received on Sat Apr 10 1999 - 23:24:33 BST