Historically the problem with grass causing double counts has been dealt
with by having a one shot that disables retriggering for almost a whole
cycle. This is pretty much every line powered digital clock from the 70's.
If you set the one shot to be for 9.5 cycles then you just invented a whole
It's not practical to convert an A to a true B model. They use a different
input front end circuit. But, the rest of the machine is compatible. The B
firmware runs on a A. John's CPU board works on either version.
Hi
A *lot* of errors on the 5370’s (A or B) can be traced to a couple of fairly
simple issues:
1) Connectors and sockets. Simple un-plug and plug back in may solve the
problem (at least for a while).
2) The power supply. The parts are pretty common, so it’s a fairly easy fix.
3) Alignment.
There really is no need to convert it to a B unit, as
the A unit has the same specifications. If you put
John Seamons' BBB CPU card in it, it will simply sing
as far as speed goes, and you can use the A or B
virtual roms as you wish.
The principle difference is the B analog boards are
easier to
In message blu170-w435e764addfe88a3a4ebeece...@phx.gbl, Mark Sims writes:
It's not practical to convert an A to a true B model. They
use a different input front end circuit. But, the rest of the
machine is compatible. The B firmware runs on a A. John's CPU
board works on either
In message 766218c3-5ac3-4189-899b-916858f1f...@n1k.org, Bob Camp writes:
A *lot* of errors on the 5370’s (A or B) can be traced to a couple
of fairly simple issues:
4) (E)PROMS loosing their memory.
--
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
p...@freebsd.org |
I saved a bunch of 5370A boards from being sent for gold scrap at a
recent TRW swap meet. A lot of the boards are common to both A and B
versions. If anyone has a need for any particular board, let me know
off list please. Nothing from the front panel.
Dan
There is a mod on the A model which was fixed in the B version.
As I recall, it was to reduce cross-talk. Bruce the almighty might
recall better than me.
I would recommend Perry to apply the BBB based CPU-boards. Good use of
the hardware at hand.
Cheers,
Magnus
On 12/19/2014 02:55 PM,
Am 19.12.2014 um 19:34 schrieb Poul-Henning Kamp:
4) (E)PROMS loosing their memory.
Are the known good eprom images available somewhere? I would like
to refurbish my 5370A over the holidays. It still seems to work but has
at least some bad contacts in the backplane from time to time.
best
Hello,
Friday, December 19, 2014, 21:34:35, Poul-Henning Kamp wrote:
PH
PH In message 766218c3-5ac3-4189-899b-916858f1f...@n1k.org, Bob Camp writes:
A *lot* of errors on the 5370’s (A or B) can be traced to a couple
PH of fairly simple issues:
PH 4) (E)PROMS loosing their memory.
Hi everyone,
The Maser Kit is progressing.
Old Teflon removed, Bulb cleaned, Ion pumps ready to test, and curing
oven under construction.
Details and PIX at:
http://leapsecond.com/corby/maser/index.htm#part3
Cheers!
Corby
___
time-nuts mailing
On Thu, 18 Dec 2014 04:26:22 -0500
Charles Steinmetz csteinm...@yandex.com wrote:
Gary n...@lazygranch.com wrote:
Why not use a lower voltage transformer, preferably not at a lethal
voltage. You only need a couple of volts to drive the rest of the
circuit.
As you can see from the
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