blog.jmp.no

Electronics, coding and hacking. And ADD.

The decoder

2011
19
September

This was a simple project I finished a while ago, but never wrote anything about.

The lack of this device was discovered while debugging my 6502 computer (which I will cover later). I needed to debug the address bus while stepping through a simple program in ROM. Due to the lack of a advanced oscilloscope, I wanted a solid device I could hook up to anything with a 16 bits wide bus or less.

16-bit address decoder

This is the final layout. The address bus is segmented in 4 bits, each passing through a MC14495, which happens to be a CMOS 4-bit parallel to 7-segment driver. All I did was to connect the dots and add a few rails for the power, and etch the bugger.

Yes, it is a simple device, but it has proved to be extremely functional and useful.


New blog; renewed courage.

2011
19
September

Welcome to my new blog, where I'll be discussing my projects, ideas and thoughts on my personal electronic projects, favorite micro controllers and C programming.

This blog will mainly be written in English, to welcome the international audience which appears to be growing.

I'll try to keep my usual lines, with explaining and de-mystifiing my recent finds, as I explore my way through the immense jungle of transistors, opto-isolators and logic gates.

Wish me luck.


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