Author Archives: nivagswerdna

About nivagswerdna

Professional Geek

PIC Delay routines done wrong

During my recent reverse engineering of a PIC12F675 learning board on EBAY I came across the following piece of code… L7: MOVWF 0x20 CLRF 0x22 L6: CLRF 0x21 L5: MOVF 0x20,W SUBWF 0x21,W BTFSC STATUS,C GOTO L4 INCF 0x21,F GOTO … Continue reading

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PIC12F675 Development Board Reversing

So here I am, frittering away a Sunday afternoon, all because I was lured into  Julien Illett’s Youtube Walk down PIC memory lane.  The development board which is useful to play along with these dabblings is an EBAY special which … Continue reading

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Electronic channels on YouTube and getting distracted

I have always had an interest in electronics from a young age, first simply charging capacitors from scrap valve-based TVs and watching the discharge curves and finding something interesting in the mathematics, the same sort of math that can be … Continue reading

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What was happening with MSF60 at 23:59:60?

Something a little bit special happened at the end of 2016.  Most people won’t really care about this sort of thing, but to as a contributor to an OpenSource library for decoding broadcast time standards, this sort of thing slightly plays … Continue reading

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Pragotron Slave Clock – Part 4 – Odd’s and Ends

Given that my clock driver is complete and seems to work quite nicely I think I will move on to other projects however if anyone else is considering building their own variant to drive a vintage clock then I’ll leave … Continue reading

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Pragotron Slave Clock – Part 3 – Software

My previous experiments around decoding long wave radio time signals primarily involved using the UK’s time signal MSF60 (https://en.wikipedia.org/wiki/Time_from_NPL) previously known as the Rugby time signal. This transmission no longer originates from Rugby, it moved north to cumbria and seems … Continue reading

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Pragotron Slave Clock – Part 2 – High level design

So with my clock sitting idle on the wall it is time to come up with a design that will send it periodic pulses, once per minute, with +24V and then -24V on alternate minutes… I really want this to … Continue reading

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