Post Created date
groundloop and field EMIs
Your wiring will act as antenna for lightning. You need lightning protection.
Friday, 26 March 2021 - 08:57
ISA VGA on AVR problem
The previous post was 11 years ago.   I'd have to look hard through my old junk box to find an 8bit ISA vga card. Even a mga/cga combo might be tricky. A 16bit ISA one is...
Thursday, 25 March 2021 - 11:48
RS485 info
Send out a preamble before transmitting. Other stations can sense this and back off if they want to transmit. If you do have a collision, then hopefully it happens within the...
Thursday, 25 March 2021 - 11:44
ISA VGA on AVR problem
I think you're 11 years too late. Recently someone posted an 8086 emulation for the AVR. Run that and it can execute the bios rom on the vga card and initialise itself.  ...
Thursday, 25 March 2021 - 11:31
Return from an ISR to a function different from where it is called. Possible ?
engineering is full of compromises - you want it simple and there's a baked solution available that would do precisely what you want but you'd need to get a bigger chip. Or do it...
Wednesday, 24 March 2021 - 11:00
groundloop and field EMIs
How are you protecting against lightning? petir besar? I spent a lot of time in east malaysia installing instrumentation systems - they're probably still working 15+ years later...
Wednesday, 24 March 2021 - 10:51
8086 emulator on Arduino UNO (atmega328p)
It should run like a rocketship on your Teensy 4.0 Cliff!  
Wednesday, 24 March 2021 - 10:47
Program Counter set to 0xFFFFFFFE
I'm on a real computer rather than a mobile device, so I can search easier.    This article is gold. There's some more gems on the website.   https://interrupt...
Wednesday, 24 March 2021 - 09:07
Program Counter set to 0xFFFFFFFE
The ARM puts magic numbers on the stack to identify interrupts. Guess what one of those magic numbers is? Goto arm.com and have fun finding the relevant information!
Wednesday, 24 March 2021 - 05:21
Return from an ISR to a function different from where it is called. Possible ?
Freertos will do this for you.
Tuesday, 23 March 2021 - 05:03
Using two .h files to avoid link and scoping problems, maybe.
For those that are ‘on the spectrum’ and suffer from depression will recognise this type of behaviour. The way we treat others is a reflection of how we treat ourselves, so I’d...
Monday, 22 March 2021 - 20:45
Using two .h files to avoid link and scoping problems, maybe.
There's two sides to Asperger's. Something like there's a fine line between genius and...    
Monday, 22 March 2021 - 11:12

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