In message [EMAIL PROTECTED], John Miles writes:
Actually, since each EPROM is now 4x bigger than necessary, couldn't you do
all this with just one chip? The circuit must be decoding a couple of
high-order address lines to drive the chip-select pins of the other three
EPROMs, so you'd just tie
] HP8568B firware eproms anyone ?
Heh, that's great. Interesting that at least some CMOS parts will work.
I
may have had some bad chips, but the same ones that failed in an 8566B
worked fine in a 494AP.
Not knowing what happens if an address line toggles in the middle of a
read
cycle, I wonder
From: Poul-Henning Kamp [EMAIL PROTECTED]
Subject: Re: [time-nuts] HP8568B firware eproms anyone ?
Date: Thu, 19 Oct 2006 11:47:52 +
Message-ID: [EMAIL PROTECTED]
Poul-Henning,
http://phk.freebsd.dk/misc/8568b_flash.png
Somebody at Agilent will cry if they see this :-)
But it works
On Thu, 19 Oct 2006 11:47:52 +, Poul-Henning Kamp
[EMAIL PROTECTED] wrote:
But it works, thanks a bundle for the help!
Poul-Henning
Umm, I don't think specifically we heard that you got the ROM image you
were looking for. Assuming you must have, the adaptation of the chips is
something that
In message [EMAIL PROTECTED], Rex writes:
On Thu, 19 Oct 2006 11:47:52 +, Poul-Henning Kamp
[EMAIL PROTECTED] wrote:
But it works, thanks a bundle for the help!
Poul-Henning
Umm, I don't think specifically we heard that you got the ROM image you
were looking for. Assuming you must have, the
Heh, that's great. Interesting that at least some CMOS parts will work. I
may have had some bad chips, but the same ones that failed in an 8566B
worked fine in a 494AP.
Not knowing what happens if an address line toggles in the middle of a read
cycle, I wonder if it'd be a good idea to tie
In message [EMAIL PROTECTED], John Miles writes:
Heh, that's great. Interesting that at least some CMOS parts will work. I
may have had some bad chips, but the same ones that failed in an 8566B
worked fine in a 494AP.
Not knowing what happens if an address line toggles in the middle of a read
My kind of guy :-)
Congratulations!
Reminds me a long time ago when building 120 audio amplifiers as part of
a college hobby gone crazy, I had laid out my PWB for mini-DIP (DIP8)
op-amps (uA709, because that's all there existed back then), with the
frequency compensation caps at each end of
Many CMOS chips draw higher supply current with floating inputs, as the
internal buffers may bias themselves in the middle of the range, where
both transistors are turned on. That may lead to increased temperature
and failure over time. In many cases, floating inputs will simply toggle
as a
of your new EPROM.
-- john, KE5FX
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
Behalf Of Didier Juges
Sent: Thursday, October 19, 2006 5:34 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] HP8568B firware eproms anyone
Subject: RE: [time-nuts] HP8568B firware eproms anyone ?
Actually, since each EPROM is now 4x bigger than necessary,
couldn't you do all this with just one chip? The circuit must be
decoding a couple of high-order address lines to drive the
chip-select pins of the other three EPROMs, so you'd
Poul-Henning Kamp said the following on 10/18/2006 05:48 PM:
I'm not sure if the firmware of the 8566B is different from the 8568B,
anyone know ?
I'm pretty sure that the '66 firmware is different than the '68, or I'd
offer to copy mine for you.
I think this is the second report of eprom
On Wed, Oct 18, 2006 at 05:53:21PM -0400, John Ackermann N8UR wrote:
Poul-Henning Kamp said the following on 10/18/2006 05:48 PM:
I'm not sure if the firmware of the 8566B is different from the 8568B,
anyone know ?
I'm pretty sure that the '66 firmware is different than the '68, or I'd
-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf
Of Poul-Henning Kamp
Sent: Wednesday, October 18, 2006 6:07 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] HP8568B firware eproms anyone ?
In message [EMAIL PROTECTED], John Ackermann N8UR writes
I work for Agilent. In my lab I have both an 8568B and an
8566B. How would I read out the contents of the eproms?
I don't know much about eproms.
I looked up that part number; it is an AMD27C256-200DC.
There are a bunch of reliability reports on it, so that
sort of confirms that yours may
From: Rick Karlquist [EMAIL PROTECTED]
Subject: Re: [time-nuts] HP8568B firware eproms anyone ?
Date: Wed, 18 Oct 2006 15:21:27 -0700 (PDT)
Message-ID: [EMAIL PROTECTED]
I work for Agilent. In my lab I have both an 8568B and an
8566B. How would I read out the contents of the eproms?
I don't
In message [EMAIL PROTECTED], Rick K
arlquist writes:
Hi Rick,
I'll try the ones at the bluefeather archive first, if that fails
I may get back to you.
Poul-Henning
I work for Agilent. In my lab I have both an 8568B and an
8566B. How would I read out the contents of the eproms?
I don't know
John Miles ([EMAIL PROTECTED]) on hp_agilent_equipment (yahoo) has a lot of
experience with the 8568 and 8566 analyzers and is probably your best
opportunity to find what you need. I know he had an 8568 which he sold,
but not before copying the EPROMs.
Didier KO4BB
Poul-Henning Kamp wrote:
The CPU board is shared with the 8566B, but the firmware is completely
different. The images on the Blue Feather FTP archive are from my previous
8568B. Poul, if you need a set of them burned for you, drop me a line
off-list with your address... be glad to send you some.
Note that the part
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