Did either of you guys find a source of the Schaffner input socket at a reasonable price (ie less than twice the cost the 7150 sells for on eBay :-)) ) I have a "spares box full of one that only needs a replacement fiter.....iif I cant get the right one I will bodge something up. I do have a service manual of sorts its usable though I recollect not a brilliant scan.
Alan G3NYK ----- Original Message ----- From: "Philip Pemberton" <[email protected]> To: "David C. Partridge" <[email protected]>; "Discussion of precise time and frequency measurement" <[email protected]> Sent: Tuesday, July 21, 2009 1:01 PM Subject: Re: [time-nuts] Wanted - Service Manual for Solartron 7150+ DMM David C. Partridge wrote: > As and when you get a chance to look and if you find it I will be > interested. Still arguing with the bootloader on my Windows/Linux box, unfortunately. It'll boot Linux more than happily, but GRUB's "chainloader" isn't passing control over to the XP bootloader properly. Ugh. > There are a few differences on the floating board - different uP and a few > other differences. The uC is an HD637B01V0P which is a one time > programmable uC. Can be replaced with UV erasable HD637B01V0C if you can > find on that is (hen's teeth). Huh. Didn't spot one of those when I last had mine open (to clean up the mess from, and replace an incendiary mains filter), but then again I wasn't looking specifically at the floating board. Though truth be told, if you had a copy of the ROM contents for that thing, you could replace it with an FPGA and a few other bits on a "bodge board". Most of the "other bits" would be related to bootstrapping the FPGA (basically you'd need a serial config ROM, e.g. an Altera EPCS or Xilinx Platform Flash) and running the oscillator. You're probably talking £5 FPGA + (maybe) a cheap ROM + £2 worth of 74xx logic (level translators + oscillator) and a PCB. Maybe £30 total parts, less if you built the PCB yourself. I dumped the main ROM from the controller board *years* ago; it's on Bruce Lane's FTP archive (ftp.bluefeathertech.com) under electronics/testgear/solartron/firmware. That's a 27128, and not hard to replace. What's actually wrong with your 7150+? > If you make an appropriately wired adapter from 40 pin to 28 pin I think you > could probably read the internal ROM as if 27256. Probably. Is it soldered down? The datasheet doesn't mention any form of security / code protection, which is nice... :) Reading out the ROM shouldn't be a problem at all -- replacing the chip on the other hand... -- Phil. [email protected] http://www.philpem.me.uk/ _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
