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 bro...@pacific.net 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 ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Solartron 7081 ROMs
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 bro...@pacific.net 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 ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Solartron 7081 ROMs
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 pvi...@theiet.org To: bro...@pacific.net; Discussion of precise time and frequency measurement time-nuts@febo.com 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 bro...@pacific.net 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 ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Solartron 7081 ROMs
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. http://en.wikipedia.org/wiki/Shmoo_plot Joe Gwinn Peter Vince On Tue Apr 28 15:40 , Brooke Clarke bro...@pacific.net 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 ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi- bin/mailman/listinfo/time-nuts and follow the instructions there. The following line is added for your protection and will be used for analysis if this message is reported as spam: (Raytheon Analysis: IP=64.34.164.147; e-from=time-nuts- bounces+gwinn=raytheon@febo.com; from=pvi...@theiet.org; date=Apr 29, 2009 7:52:38 PM; subject=Re: [time-nuts] Solartron7081 ROMs) ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[time-nuts] HP 117 A On eBay
Hi: Tom Becker asked that I let you know he is selling an HP 117A: http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItemitem=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 ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
