Message: 26
Date: Sat, 16 May 2009 12:31:25 -0400
From: Ethan Dicks <ethan.dicks at gmail.com>
Subject: Re: DEC ST506 Interface Adapter Part No 54-17003-01
To: "General Discussion: On-Topic and Off-Topic Posts"
<cctalk at classiccmp.org>
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<f4eb766f0905160931veb8ff8ax6957d5c2abd0d432 at mail.gmail.com>
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On Thu, May 14, 2009 at 5:51 PM, Julian Skidmore
<julianskidmore at yahoo.com> wrote:
> >> I thought it could only format
"known" disk types, not arbitrary disks
> >> (a firmware limitation in the formatter application, not a hardware
> >> limitation).
>
> Surely, it's possible to hack an RQDX3 controller's ROM to support arbitrary
geometries?
The geometries aren't in the RQDXn ROMs - the formatter application
writes them to the disk during the formatter process.
There are three VAX formatters I know of - the ROMs on a VS/uV2000,
the Customer Runnable Diagnostics (CRD) and the Field Service
diagnostics.
I know the CRD formatter only allows you to select known drives from a
menu table and the Field Service formatter allows you to enter
arbitrary values (i.e., has a menu plus a fill-in page). The
ROM-based formatter on the VS/uV2000 was the one I appear to have
mis-remembered the capabilities of.
No hacking of the RQDX3 is required, just selection of the right
formatter application.
However, all information is not just located on the disk either.
The RQDX1 and RQDX2 use a format that is incompatible with the RQDX3. In
order to use an RD52 (for instance) that has been formatted on a RQDX2
on a RQDX3, you need to reformat it...
Also, an RQDX1 or RQDX2 cannot control an RD54. No matter what
formatting program you use. You need the RQDX3 for that.
Johnny
--
Johnny Billquist || "I'm on a bus
|| on a psychedelic trip
email: bqt at softjar.se || Reading murder books
pdp is alive! || tryin' to stay hip" - B. Idol