CPC 464 Breadboarding - 7-Segment LED Display for CPC

[LambdaMikel]

Hi board,

as a demo / illustration for my DIY CPC 464 breadboard coupler / adapter, I would like to share a little CPC 464 hardware extension on a prototyping breadboard with you - a 7segment display for the CPC 464. It shows address decoding using 2 Atmel G16V8B PLD's, latching a nibble from the databus, IORQ* and RD* chip select, and features a CD4543BE 7segment driver for the 7segment display:


https://youtu.be/Lyb3IRQwyl4

The idea behind the breadboard adapter was to facilitate CPC 464 hardware tinkering by making the expansion port more accessible - similar to these GPIO Breakout Board / Cobbler for the Raspberry PI. Why always use the Raspberry PI, if the CPC can also do it? Moreover,  CPC is "instant on", no boot process 

If you would like to purchase one of these expansion port breadboard adapter, please check my Ebay page.

http://www.ebay.com/usr/wesse5161.qolzl

I believe it is mostly for educational & recreational purposes, but I also believe that it makes CPC 464 hardware prototyping much easier. I admit that address decoding makes it more difficult than using GPIO on the Raspberry PI, but it is definitely fun as well

Cheers,
Michael

[Bryce]

Nice idea. Btw, you shouldn't put a single current limiting resistor on the common cathode. Use a seperate resistor for each segment on the anode, otherwise the LEDs brightness depends on how many segments are turned on.

Bryce.

[LambdaMikel]

Thanks Bryce!
That's a typical rookie mistake I suppose (besides not having enough resistors...)
Just starting with hardware tinkering - will be fixed.

Cheers,
Michael

[Bryce]

No probs. Always good to see new people getting involved in electronics.

Bryce.