Vector and ST506

[Jules Richardson]

Chuck Guzis wrote:
> Well, the ST506 knows nothing from sectors--it's about as "bare" and 
> interface as they come.  I wonder if by "constant index" it's meant 
> that there's always an INDEX/ signal present; not just when the drive 
> is selected. 

I'm not sure that a true ST506 can be jumpered to be permanently selected - I 
think that only came along with ST412-type drives. (The schematics are in the 
ST506 service manual, but I'm not awake enough yet to go looking!)

I've gone and deleted previous messages, so I'm lacking context here, but I'd 
interpret "constant index" as meaning that there's a single index pulse 
present for every cylinder (i.e. behaviour doesn't change depending on current 
cylinder)

cheers

Jules