Re: [time-nuts] Solartron 7081 ROMs

[David C. Partridge]

An update - another rom reader/burner was able to read the ROM, and
replacing ALL the ROMs with new ones burnt from the originals brought the
meter back to life.  The original ROMs wouldn't work. 

So that's another truly fine piece of test equipment brought back from the
graveyard and good for another few decades :-).

Dave
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of David C. Partridge
Sent: 28 April 2009 15:17
To: teksco...@yahoogroups.com; tekscop...@yahoogroups.com;
hp_agilent_equipm...@yahoogroups.com; 'Discussion of precise time and
frequency measurement'
Subject: [time-nuts] Solartron 7081 ROMs

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.


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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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Re: [time-nuts] Solartron 7081 ROMs

[Brooke Clarke]

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 <= It is this one I want
 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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[time-nuts] Solartron 7081 ROMs

[David C. Partridge]

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 <= It is this one I want
 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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