23 Aug
2005
23 Aug
'05
12:16 a.m.
In message <0ILN001WBHXEEOX0 at vms040.mailsrvcs.net>
Allison <ajp166 at bellatlantic.net> wrote:
If I can ever scan it there is a design I have (NEC
apnote) for a
data seperator for FM/MFM that works for any rate and media. Uses
a prom and a latch (yes a state machine) to do synthetic PLL. Analog
PLLs were causing people too much pain and oneshots perform poorly.
I would love a copy of that appnote - either scanned or photocopied is good
(if photocopied, I'll scan it and put it online myself). I've seen another
design that uses a state machine, but couldn't find any info on what it could
handle or how it worked. It's on
<http://www.simandl.cz/stranky/zxs/zxs_a.htm> if anyone's interested.
I'd really like to get my hands on any of the Rockwell/MOS/Synertek
6502-series appnotes, or anything on the uPD765 or R6765. Also, has anyone
got any data on the Fairchild 96LS488?
Lacking that if you can find SMC9229 or '39 part
that does a lot
of the work for you.
*checks Google
Obsolete and unobtainium. :(
The datasheet is probably on Bitsavers, but I doubt it's got any real info on
how the chip works internally. Certainly not enough to reimplement it from
off-the-shelf parts.
Thanks.
--
Phil. | Acorn RiscPC600 SA220 64MB+6GB 100baseT
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