19 Sep
2006
19 Sep
'06
8:46 p.m.
On 9/19/2006 at 11:45 PM ard at p850ug1.demon.co.uk wrote:
Now, the data separator should be able to lock to an
8" SD data stream.
It's the same bit rate as the 6.25" DD data it's supposed to be working
with. And just about any pulse sequence that an occur in an FM stream can
also occur in an MFM stream.
I'm unable to test the original 5150 FDC with this--I put it in an XT and
no interrupts. A little probing showed that U7, an MC3487 is bad on mine.
Not an IC in my hellbox, so the antique goes back on the shelf with a
sticker reminding me of the problem. I'm not inclined to hash up a
substitute (say a 74LS368) for it.
Someone else is going to have to try this.
Cheers,
Chuck