On 01/04/2014 12:19 PM, Tom Gardner wrote:
There is nothing in a standard disk drive MFM
interface that signals the
drive size. This is almost always a jumper setting and almost always on the
controller; one set of jumpers for each drive controlled. If the controller
also has some BIOS on it, it could be a BIOS jumper setting.
Tom
> -----Original Message-----
> From: Robert Jarratt [mailto:robert.jarratt at
ntlworld.com]
> Sent: Saturday, January 04, 2014 3:36 AM
> To: General Discussion: On-Topic and Off-Topic Posts; DEC discussion list.
> Subject: MFM Control Signals and RD disk size
>
> As I don't have a logic analyser to help me with my analysis of the MFM
> interface, can anyone tell me how the MicroVAX 2000 determines disk size?
First
I keep a uVAX2000 as a DEC compatible formatter.
I also have XXDP diags for my -11 based systems for RQDX2 and 3.
It does one of two things. Read the disk for previously placed info and
uses it.
Failing that the user MANUALLY enters that.
If you don't what the number are... Try google for the drive data all
the the most wierd
are there.
Allison