Copying DEC VAX set up disks rx50, help
cclist at sydex.com
Sun Mar 4 17:26:02 CST 2007
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
...or you can use a Catweasel.
...or you can wire wrap a prototype board with a WD 17xx/27xx
controller for your PC.
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