Copying DEC VAX set up disks rx50, help

[Chuck Guzis]

On 4 Mar 2007 at 13:36, Fred Cisin wrote:

> Once more: the index pulse "band-aid" is only for reading and writing disk
> sectors.  It is not ever for use during formating.

Said mod can also backfire if the disk has an unreadable sector ID 
header.  Because the 765 returns a SNF error after seeing the index 
pulse 2 times while searching, the result will be a "Drive not ready 
error".  If you're ambitious, you can add a flip-flop to the index 
line and divide it by 2 so the controller sees an index pulse every 
other rotation which ought to help sort things out.   

Doesn't help much on formatting, but then, tweaking some gap lengths 
can often squeeze in the  required number of sectors even when an IAM 
is written.  

...or you can use a Catweasel.

...or you can wire wrap a prototype board with a WD 17xx/27xx 
controller for your PC.

Cheers,
Chuck