29 Dec
2005
29 Dec
'05
6:32 p.m.
----- Original Message -----
From: "Roger Merchberger" <zmerch at 30below.com>
To: "General Discussion: On-Topic and Off-Topic Posts"
<cctalk at classiccmp.org>
Sent: Thursday, December 29, 2005 7:15 PM
Subject: Re: Changing the clock frequency slightly (PDP-11)?
Rumor has it that Charles may have mentioned these
words:
The 27 MHZ unit is only 333 Hz off,
which is 0.00125%, if I have my decimal
point correct.
A common trick to change the frequence of a crystal, is to put a capacitor
in parallel with it.
Nico
After pulling out my hair for a while trying to
get my PDP-11 to
talk to me, I finally discovered that the master clock (26.667 MHz
crystal oscillator) is dead. (KDF-11BA CPU board).
Those metal-package oscillators are very common and inexpensive
(around $2), but I can't find one in that exact frequency. 25,
25.175 and 27 MHz units are available.