| Electronics > Repair |
| Rohde & SchwarzSMS/SMS2 Microprocessor Board, where is the code/firmware stored? |
| << < (3/4) > >> |
| RichardM:
So my only hope is for someone to be skilled enough, willing enough, game enough, to try to extract the firmware form their P8049 and generously upload :). |
| Tom D:
Hi Richard, If it was me, I don't think I'd bother to go through all of that. Rather, I'd be on the lookout to obtain an EPROM based 7057 board to upgrade the machine. As you may be aware, there are quite a few extra features the 7057 micro board provides over the basic 7111 equipped SMS. These are being able to set the GPIB address without having to pull the cover off the machine, non-volatile storage of 40 complete device settings (including frequency, modulation and level), current device settings are saved in the event of shut down or AC supply failure, and push button conversion into any of the four level units (uV, mV, dBuV and dBm) - if you do this on a 7111 equipped SMS, it makes like a Tasmanian; it's too dumb to calculate or convert the level units and the Overflow LED flashes. I have two 7057 board equipped SMS's I've used together. After a very late night imbibing obscene amounts of caffeine whilst plotting third order intercept points of radio control receivers, it was nice to be able to shut down everything and retire for the night knowing I could resume where I left off, with all the settings intact, at my own leisure. On the other hand, a 7111 micro board equipped SMS is terminally afflicted with power-on Alzheimer's Disease. Tom |
| RichardM:
Hi Tom I will keep key eyes open online for a 7057 board. I really don’t need a third complete unit so I may be waiting for a while. I may transplant the oven open option and doubler in the meantime. Nice to have another set of buttons also:) Richard |
| MathWizard:
So how much code would there be on 1970s-80's era test equipment ? From scratch, how long would it take to recreate ? Would it be like a weekend problem, or more like an end of the semester project ? As more chips from that era fail, how hard is it to splice in modern chips and create suitable programming ? I have an older 3.5d or 4.5d Keithley DMM, I think all the hardware is off-the-shelf parts. Way down the road, I'd like to try make some code for it, w/ some modern MCU. I think I found it's firmware before, and it didn't seem that big to me, a novice programmer. If I could do that, I'd also like to try upgrading from 3.5d (or 4.5d) to 4.5d(5.5), with a few new chips added. BUt IDK how much work that would really take, for good results anyways. |
| RichardM:
I managed to source another 7111 board on ebay. To my horror it appears the P8049 chip on that board is dead. Argh!!!! I built an Arduino reader based on the great work on mattmillman.com but the 2k mask rom read is different every time. The arduino writes and reads a P8749 fine. If only there was an SMS owner out there willing to read and upload the P8049 ROM for future prosperity 😀 |
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