The CNC controller IC reminds me of the STM32F429 in probably the 208 package, but not sure about the corner markings. I will have to check if STM32 uses those.
The CNC controller IC reminds me of the STM32F429 in probably the 208 package, but not sure about the corner markings. I will have to check if STM32 uses those.
Having had a look at the datasheet the location of the two crystals matches up nicely with the OSC_IN and RTC_REF pins on the IC.
The CNC controller IC reminds me of the STM32F429 in probably the 208 package, but not sure about the corner markings. I will have to check if STM32 uses those.
Having had a look at the datasheet the location of the two crystals matches up nicely with the OSC_IN and RTC_REF pins on the IC.
I just checked and my stm32f429 only has two dimples. But it is only 144pin.
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The Russian multimeter is a beauty. I was not expecting some quality point to point wiring when he opened it. The Sinclair, not so much.
Dave did make me feel better about my antiquated multimeter since he was raving about his first being an RS and gave him years of service. Mine is a Radio Shack (Micronta) 22-211A. I'm guessing I've had it since around '94/95, so it's served me well since I've never had an issue with it. It's always been for low V/A use, so I' guessing that's probably helped. It was a one of the nicer meters RS had back in the day.
That Russian Multimeter is C-20 - very popular and ubiquitous model in the USSR in the 60's-70's. I got one as a teenager and had it for something like 20-years - never failed me even with all the abuse that a stupid kid could impart on it.
Too bad Dave failed to open the battery compartment - the battery is a unique 4.5V dry cell with flat leads, which were very conveniently located for one's tongue to fit in for voltage measurement
Peter.
Too bad Dave failed to open the battery compartment - the battery is a unique 4.5V dry cell with flat leads, which were very conveniently located for one's tongue to fit in for voltage measurement
Unique? Well, they aren't all that common anymore but when I was a kid they were ubiquitous.