26 Oct
2008
26 Oct
'08
2:38 p.m.
Roy J. Tellason wrote:
> As I understand it there was no 'standard'
format for ST-506/ST-412
> formats. It varied from chip to chip/controller to controller/
> implementation to implementation.... I'm not sure what specifically
> differed.... but even from PC to PC, the one or two times I attempted
> to do it didn't work (different brand/model controllers).
>
You're correct that there wasn't true standard. The 7300/3B1 uses
a WD
1010 HDC, which IIRC was second sourced as the Intel 82062. (Some
people field-upgraded them to the 2010/Intel 82064.) It is MFM, *not*
RLL, so it definitely will not be possible to access the data using an
RLL controller on a PC. Many, though not all, MFM controllers on PCs
should be able to read it, especially genuine WD MFM controllers. Some
other MFM controllers will be compatible, and others won't.
Eric