Pinout for SED9421
ard at p850ug1.demon.co.uk
Thu Nov 24 14:45:22 CST 2005
> On 11/23/2005 at 8:01 PM ard at p850ug1.demon.co.uk wrote:
> >Does anyone have the pinout (or a datasheet) for the SED9421 chip (18 pin
> >DIL package).
> I found this on a Japanese site:
> 3. ph1
> 5.RD DATA
Thanks for that. It seems to make sense against the PCB I'm investigating...
> It appears to be a VFO for use with the SED9420C data separator (like you'd
> find in an Amstrad CPC).
I never thought to look in Amstrad service manuals (and I have quite a
number of them). They sed the SED9420 quite a lot (in the CPC, PCW, etc),
but never with an external VCO.
Are you sure the SED9421 is not a complete data seperator? The PCB I am
looking at (from an Epson PF10 drive unit) doesn't seem to have much else
around the 765 disk controller chip.
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