[time-nuts] Cheap 5370A on eBay
I believe there are 5370 ROM dumps on KO4BB.COM I few years back i posted on this forum how I restored a 5370A that had a missing ROM board by installing an EEPROM into the empty socket on the CPU board. I did have to jumper a couple of address lines to the EEPROM and perhaps tweak the data buffer enable signal... it's been a while. The 5370A normally uses a separate ROM board containing the firmware in several ROM chips. I read out those chips from a good machine and merged the data into a single EPROM. ___ 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] Cheap 5370A on eBay
In message blu170-w651e405ea49cc0fe9e42d0ce...@phx.gbl, Mark Sims writes: I believe there are 5370 ROM dumps on KO4BB.COM They're also in the BBB-5370 repos. I few years back i posted on this forum how I restored a 5370A that had a missing ROM board by installing an EEPROM into the empty socket on the CPU board. I did have to jumper a couple of address lines to the EEPROM and perhaps tweak the data buffer enable signal... it's been a while. The 5370A normally uses a separate ROM board containing the firmware in several ROM chips. I read out those chips from a good machine and merged the data into a single EPROM. One detail to be aware of if you do this, is that the HP5370 uses inverters as address line buffers. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence. ___ 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] Cheap 5370A on eBay
On 12/19/2014 10:40 PM, Mark Sims wrote: I few years back i posted on this forum how I restored a 5370A that had a missing ROM board by installing an EEPROM into the empty socket on the CPU board. Based off of that, I did similar, and documented it here: http://www.flatsurface.com/5370A/ ___ 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] Cheap 5370A on eBay
On Sat, Dec 20, 2014 at 12:12 AM, Poul-Henning Kamp p...@phk.freebsd.dk wrote: In message blu170-w651e405ea49cc0fe9e42d0ce...@phx.gbl, Mark Sims writes: I believe there are 5370 ROM dumps on KO4BB.COM They're also in the BBB-5370 repos. I few years back i posted on this forum how I restored a 5370A that had a missing ROM board by installing an EEPROM into the empty socket on the CPU board. I did have to jumper a couple of address lines to the EEPROM and perhaps tweak the data buffer enable signal... it's been a while. The 5370A normally uses a separate ROM board containing the firmware in several ROM chips. I read out those chips from a good machine and merged the data into a single EPROM. One detail to be aware of if you do this, is that the HP5370 uses inverters as address line buffers. I suppose that would affect the order in which you merge the ROMS into a single (E)EPROM, but that's hardly necessary any more. The images in the BBB repos are in the reversed order necessary for programming a new ROM. I had to reverse the order to disassemble the code... ___ 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] Cheap 5370A on eBay
Hi A *lot* of errors on the 5370’s (A or B) can be traced to a couple of fairly simple issues: 1) Connectors and sockets. Simple un-plug and plug back in may solve the problem (at least for a while). 2) The power supply. The parts are pretty common, so it’s a fairly easy fix. 3) Alignment. This takes a while, but these beasts do drift. No I’m not suggesting that you buy every single 5370 based on it being an “easy fix”. I would indeed check 1 and 2 above on any 5370 that comes in. There are things like ROM’s with known defects that die and are a bit more problematic to replace ( = get the replacement CPU board). Bob On Dec 18, 2014, at 6:10 PM, Orin Eman orin.e...@gmail.com wrote: #151518774079 Currently at $49.95 plus shipping. It's showing a ROM error (7.7) on startup. I asked what the error was this morning and they posted pictures this afternoon. It could be a candidate for one of John Seamons' 5370 processor replacement boards assuming nothing else is wrong. I have the minimum bid in, but if anyone else wants it, go for it; I already have one. Orin. ___ 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] Cheap 5370A on eBay
In message 766218c3-5ac3-4189-899b-916858f1f...@n1k.org, Bob Camp writes: A *lot* of errors on the 5370’s (A or B) can be traced to a couple of fairly simple issues: 4) (E)PROMS loosing their memory. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence. ___ 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] Cheap 5370A on eBay
Am 19.12.2014 um 19:34 schrieb Poul-Henning Kamp: 4) (E)PROMS loosing their memory. Are the known good eprom images available somewhere? I would like to refurbish my 5370A over the holidays. It still seems to work but has at least some bad contacts in the backplane from time to time. best regards, Gerhard ___ 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] Cheap 5370A on eBay
Hello, Friday, December 19, 2014, 21:34:35, Poul-Henning Kamp wrote: PH PH In message 766218c3-5ac3-4189-899b-916858f1f...@n1k.org, Bob Camp writes: A *lot* of errors on the 5370’s (A or B) can be traced to a couple PH of fairly simple issues: PH 4) (E)PROMS loosing their memory. Sometimes it is possible to extract original contents from leaked EPROMs (and some parallel 28-series EEPROMS) by reading at reduced Vcc. I done this several times with old test gear (Marconi 2955 sitting on my workbench had leaked calibration data in EEPROM, for exapmle, and it was recovered successfully). Erased cell reads as logical one, programmed as log. 0. So, with time, some programmed bits in weak cells revert to 1. Usually I read chip at 5V a number of times, and save data in separate files, then gradually decrease Vcc in 0.1V steps and continue to save everything. Usually at some point there is no more new zeros appearing, and comparing EPROM against readed data multiple times does not produce any difference. If so, it is relatively good chance that we have in buffer the same data that was originally programmed. Data is programmed to a new chip, and old one saved for reference to return to it if something going wrong. If it is impossible to find stable reading voltage (for example for older NMOS EPROMs that give up at 4.5V or so), it is still possible to statistically find unstable bytes, processing a batch of files readed at different voltages and from heated and cooled chip, but result is much less reliable. I understand, that it is always better to have a backup or to find correct image from another unit, but sometimes EPROMs contain factory calibration data, and you have to extract all that possible from original chips. -- Best regards, Yuri mailto:y...@ostry.ru ___ 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] Cheap 5370A on eBay
#151518774079 Currently at $49.95 plus shipping. It's showing a ROM error (7.7) on startup. I asked what the error was this morning and they posted pictures this afternoon. It could be a candidate for one of John Seamons' 5370 processor replacement boards assuming nothing else is wrong. I have the minimum bid in, but if anyone else wants it, go for it; I already have one. Orin. ___ 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.
