[time-nuts] HP 117 A On eBay

[Brooke Clarke]

Hi:

Tom Becker asked that I let you know he is selling an HP 117A:
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=150342448013
he also has a link to the HP Journal of 1964.
http://www.hparchive.com/Journals/HPJ-1964-10.pdf

A trivia item at the end of the article you can see a dymec logo (upside 
down hp logo).


--
Have Fun,

Brooke Clarke
http://www.prc68.com


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Re: [time-nuts] Solartron 7081 ROMs

[Joseph M Gwinn]

time-nuts-boun...@febo.com wrote on 04/29/2009 03:50:12 PM:

> I'm sure there was a message on this group a month or two ago, 
> where the bottom
> line was to read the EPROMs with a slightly lower than usual voltage.

Look up "schmoo plots", which are used to determine the temperature by 
supply voltage region over which a logic device will operate.  Often these 
are contour maps showing highest operating frequency versus temperature 
and voltage.



Joe Gwinn

 
> Peter Vince
> 
> 
> On Tue Apr 28 15:40 , Brooke Clarke  sent:
> 
> >Hi Dave:
> >
> >I've read that there are some tricks to coaxing the data from memory 
> >chips related to reading them under different conditions.
> >
> >It's a lot of work, but it's possible to disassemble the code.  That 
> >would allow it to be repaired.
> >
> >Have Fun,
> >
> >Brooke Clarke
> >http://www.prc68.com
> >
> >
> >
> >David C. Partridge wrote:
> >> This is a call to anyone who has a Solartron 7081 and has 
> saved a copy of
> >> their ROMs (if you haven't you may end up in the same boat 
> as I am - the one
> >> that's up the creek without a paddle).
> >>
> >> One of the ROMs on my earthy processor board has died.
> >>
> >> It would appear that the ROMs in this 7081 were updated to a
> high level of
> >> firmware at some stage in its life as the total ROM image 
> size is greater
> >> than that of a set that was copied by Bill Ezell from his 
> 7081 even though
> >> his meter has a higher serial number (461) than mine (180).
> >>
> >> The ICs in question and the CRC16 checksums (in hex) for my 
> ROM set are:
> >>
> >>  IC430   3238
> >>  IC415   C5C0
> >>  IC414   1260 
> >>  IC413   B958
> >>  IC412   ED50
> >>
> >> If you have saved your firmware ROM images, and the 
> checksums for your ROMs
> >> match these, I would be immensely grateful if you could send
> me the image
> >> for IC414 (the middle one of the three).
> >>
> >> If as a result of reading this message you feel impelled to 
> save your ROM
> >> images and find your checksums match these ... 
> >>
> >> Obviously if I can't find a good image of that ROM, I'll 
> just install the
> >> older firmware, but one never knows.
> >>
> >> Cheers,
> >> David Partridge
> 
> 
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> date=Apr 29, 2009 7:52:38 PM; subject=Re: [time-nuts] Solartron7081 
ROMs)


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Re: [time-nuts] Solartron 7081 ROMs

[Alan Melia]

Or find the right prommer Peter :-)) Rom read correctly and image returned
to David with the right checksum.

Alan G3NYK

- Original Message -
From: "Peter Vince" 
To: ; "Discussion of precise time and frequency
measurement" 
Sent: Wednesday, April 29, 2009 8:50 PM
Subject: Re: [time-nuts] Solartron 7081 ROMs


> I'm sure there was a message on this group a month or two ago, where the
bottom
> line was to read the EPROMs with a slightly lower than usual voltage.
>
> Peter Vince
>
>
> On Tue Apr 28 15:40 , Brooke Clarke  sent:
>
> >Hi Dave:
> >
> >I've read that there are some tricks to coaxing the data from memory
> >chips related to reading them under different conditions.
> >
> >It's a lot of work, but it's possible to disassemble the code.  That
> >would allow it to be repaired.
> >
> >Have Fun,
> >
> >Brooke Clarke
> >http://www.prc68.com
> >
> >
> >
> >David C. Partridge wrote:
> >> This is a call to anyone who has a Solartron 7081 and has saved a copy
of
> >> their ROMs (if you haven't you may end up in the same boat as I am -
the one
> >> that's up the creek without a paddle).
> >>
> >> One of the ROMs on my earthy processor board has died.
> >>
> >> It would appear that the ROMs in this 7081 were updated to a high level
of
> >> firmware at some stage in its life as the total ROM image size is
greater
> >> than that of a set that was copied by Bill Ezell from his 7081 even
though
> >> his meter has a higher serial number (461) than mine (180).
> >>
> >> The ICs in question and the CRC16 checksums (in hex) for my ROM set
are:
> >>
> >>  IC430 3238
> >>  IC415 C5C0
> >>  IC414 1260
> >>  IC413 B958
> >>  IC412 ED50
> >>
> >> If you have saved your firmware ROM images, and the checksums for your
ROMs
> >> match these, I would be immensely grateful if you could send me the
image
> >> for IC414 (the middle one of the three).
> >>
> >> If as a result of reading this message you feel impelled to save your
ROM
> >> images and find your checksums match these ...
> >>
> >> Obviously if I can't find a good image of that ROM, I'll just install
the
> >> older firmware, but one never knows.
> >>
> >> Cheers,
> >> David Partridge
>
>
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> To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.


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Re: [time-nuts] Solartron 7081 ROMs

[Chris Stake]

Yes, Low supply voltage and slow access time might succeed with those old
EPROMS.
Best of luck
Chris Stake

-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Peter Vince
Sent: 29 April 2009 20:50
To: bro...@pacific.net; Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Solartron 7081 ROMs

I'm sure there was a message on this group a month or two ago, where the
bottom
line was to read the EPROMs with a slightly lower than usual voltage.

Peter Vince


On Tue Apr 28 15:40 , Brooke Clarke  sent:

>Hi Dave:
>
>I've read that there are some tricks to coaxing the data from memory 
>chips related to reading them under different conditions.
>
>It's a lot of work, but it's possible to disassemble the code.  That 
>would allow it to be repaired.
>
>Have Fun,
>
>Brooke Clarke
>http://www.prc68.com
>
>
>
>David C. Partridge wrote:
>> This is a call to anyone who has a Solartron 7081 and has saved a copy of
>> their ROMs (if you haven't you may end up in the same boat as I am - the
one
>> that's up the creek without a paddle).
>>
>> One of the ROMs on my earthy processor board has died.
>>
>> It would appear that the ROMs in this 7081 were updated to a high level
of
>> firmware at some stage in its life as the total ROM image size is greater
>> than that of a set that was copied by Bill Ezell from his 7081 even
though
>> his meter has a higher serial number (461) than mine (180).
>>
>> The ICs in question and the CRC16 checksums (in hex) for my ROM set are:
>>
>>  IC430   3238
>>  IC415   C5C0
>>  IC414   1260 
>>  IC413   B958
>>  IC412   ED50
>>
>> If you have saved your firmware ROM images, and the checksums for your
ROMs
>> match these, I would be immensely grateful if you could send me the image
>> for IC414 (the middle one of the three).
>>
>> If as a result of reading this message you feel impelled to save your ROM
>> images and find your checksums match these ... 
>>
>> Obviously if I can't find a good image of that ROM, I'll just install the
>> older firmware, but one never knows.
>>
>> Cheers,
>> David Partridge


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Re: [time-nuts] Solartron 7081 ROMs

[Peter Vince]

I'm sure there was a message on this group a month or two ago, where the bottom
line was to read the EPROMs with a slightly lower than usual voltage.

Peter Vince


On Tue Apr 28 15:40 , Brooke Clarke  sent:

>Hi Dave:
>
>I've read that there are some tricks to coaxing the data from memory 
>chips related to reading them under different conditions.
>
>It's a lot of work, but it's possible to disassemble the code.  That 
>would allow it to be repaired.
>
>Have Fun,
>
>Brooke Clarke
>http://www.prc68.com
>
>
>
>David C. Partridge wrote:
>> This is a call to anyone who has a Solartron 7081 and has saved a copy of
>> their ROMs (if you haven't you may end up in the same boat as I am - the one
>> that's up the creek without a paddle).
>>
>> One of the ROMs on my earthy processor board has died.
>>
>> It would appear that the ROMs in this 7081 were updated to a high level of
>> firmware at some stage in its life as the total ROM image size is greater
>> than that of a set that was copied by Bill Ezell from his 7081 even though
>> his meter has a higher serial number (461) than mine (180).
>>
>> The ICs in question and the CRC16 checksums (in hex) for my ROM set are:
>>
>>  IC430   3238
>>  IC415   C5C0
>>  IC414   1260 
>>  IC413   B958
>>  IC412   ED50
>>
>> If you have saved your firmware ROM images, and the checksums for your ROMs
>> match these, I would be immensely grateful if you could send me the image
>> for IC414 (the middle one of the three).
>>
>> If as a result of reading this message you feel impelled to save your ROM
>> images and find your checksums match these ... 
>>
>> Obviously if I can't find a good image of that ROM, I'll just install the
>> older firmware, but one never knows.
>>
>> Cheers,
>> David Partridge


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