[time-nuts] Dual Mixer update

2011-02-20 Thread EWKehren
It is close to 18 month now that I first proposed a D/M for $200. Thanks to the help of Corby, Richard, Brian, Bob and Hubert I think it is very close to final release. The delay is mainly due to testing, not by the five mentioned above but by others, that did get kits under the condition

Re: [time-nuts] Rom Expansion for HP5370B

2011-02-20 Thread Scott Newell
At 08:50 AM 2/19/2011, Poul-Henning Kamp wrote: Imagine a board with EPROM + ARM chip w/USB interface... HP5370B with built in allan-variance calculation, anyone ? No, I don't have the time, but if I had... I've had similar (like maybe a Luminary ARM + ethernet) thoughts. I wasn't sure if

Re: [time-nuts] Rom Expansion for HP5370B

2011-02-20 Thread Poul-Henning Kamp
In message 920772.7182...@smtp103.prem.mail.sp1.yahoo.com, Scott Newell writes: At 08:50 AM 2/19/2011, Poul-Henning Kamp wrote: I've had similar (like maybe a Luminary ARM + ethernet) thoughts. I wasn't sure if the firmware was simple enough to be re-written so that the entire CPU section

Re: [time-nuts] Rom Expansion for HP5370B

2011-02-20 Thread Don Latham
I've had similar (like maybe a Luminary ARM + ethernet) thoughts. I wasn't sure if the firmware was simple enough to be re-written so that the entire CPU section could be replaced. From reasonable ignorance, would a device like the Parallax propeller do the job? I have a couple of 5370 A models

Re: [time-nuts] Rom Expansion for HP5370B

2011-02-20 Thread Poul-Henning Kamp
In message 11df8bbd5d5941b0d47d4afe0321a8a8.squir...@webmail.montana.com, Do n Latham writes: From reasonable ignorance, would a device like the Parallax propeller do From reasonable ignorance, would a device like the Parallax propeller do the job? I have a couple of 5370 A models here... I

Re: [time-nuts] Rom Expansion for HP5370B

2011-02-20 Thread paul swed
My this would be quite a task to reverse engineer. Though only 8K of eprom I suspect its cleverly coded. But since this is a desert island kind of discussion here are my 2 cents. (Truly the value) The propellers are parallel processors. Sort of the Basic stamp2 for parallel processing. They are

Re: [time-nuts] Rom Expansion for HP5370B

2011-02-20 Thread Bob Camp
Is the CPU strictly an I/O machine or does it do any of the timing for the counter? If it's just I/O then indeed, replacing it would be a reasonable task. -Original Message- From: Poul-Henning Kamp Sent: Sunday, February 20, 2011 3:21 PM To: Discussion of precise time and frequency

Re: [time-nuts] Rom Expansion for HP5370B

2011-02-20 Thread Bruce Griffiths
Poul-Henning Kamp wrote: In message466fdfc184a3469eac08eee5ee36c...@hm.clpa.com, Bob Camp writes: Is the CPU strictly an I/O machine or does it do any of the timing for the counter? All the counting is hardware. Not so for the 5370A (was this changed for the 5370B?), the 16 bit

Re: [time-nuts] Rom Expansion for HP5370B

2011-02-20 Thread John Seamons
I've been looking at this a bit recently. Pictures here: http://jks.com I run the 5370 firmware on an m6800 emulator written in C running on a Linux box. Reads and writes to I/O space are caught and executed on the 5370 hardware via an interface board hooked up to the m6800 processor bus. This

Re: [time-nuts] Rom Expansion for HP5370B

2011-02-20 Thread Bruce Griffiths
John Seamons wrote: I've been looking at this a bit recently. Pictures here: http://jks.com I run the 5370 firmware on an m6800 emulator written in C running on a Linux box. Reads and writes to I/O space are caught and executed on the 5370 hardware via an interface board hooked up to the

Re: [time-nuts] Rom Expansion for HP5370B

2011-02-20 Thread John Miles
I've been looking at this a bit recently. Pictures here: http://jks.com Cool as heck! The next step is to move everything to a microcontroller (e.g. SAM7X) on a card that replaces the processor board completely. As has been mentioned you can do all sorts of crazy, and perhaps useful,

[time-nuts] Watches-Another perspective

2011-02-20 Thread Perry Sandeen
List, It was a bucolic spring day and a lawyer was riding down the road in his red Ferrari and his arm resting out on the open window ledge. Suddenly a truck goes by and sideswipes the driver’s side and doesn’t stop. The lawyer crawls out of his car stands on the drivers side and says “My

Re: [time-nuts] Rom Expansion for HP5370B

2011-02-20 Thread Poul-Henning Kamp
In message 5eed908f-6a51-4447-b433-84b0e0fdd...@jks.com, John Seamons writes: I've been looking at this a bit recently. Pictures here: http://jks.com Kudos for that picture :-) I have a question about the dead time of the 5370. Can it be eliminated with a fast enough processor, buffering,

Re: [time-nuts] Rom Expansion for HP5370B

2011-02-20 Thread Poul-Henning Kamp
In message 4d61de84.3050...@xtra.co.nz, Bruce Griffiths writes: Poul-Henning Kamp wrote: In message466fdfc184a3469eac08eee5ee36c...@hm.clpa.com, Bob Camp writes: Is the CPU strictly an I/O machine or does it do any of the timing for the counter? All the counting is hardware.

Re: [time-nuts] Rom Expansion for HP5370B

2011-02-20 Thread Javier Herrero
El 21/02/2011 05:55, John Seamons escribió: The next step is to move everything to a microcontroller (e.g. SAM7X) on a card that replaces the processor board completely. Perhaps an AT91SAM7SE512 - it has an external addr/data bus, with quite flexible configuration, and USB - but no Ethernet