Just search the forum here for the designs I've made and the schematics you
need, you'll find my Youtube links there to.
Did you get the circuit board in the photos, if so please contact me
offline.
/Martin
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And this helps a lot: https://en.wikipedia.org/wiki/Intel_8255
On Wednesday, June 5, 2019 at 11:53:39 AM UTC-4, Keith Moore wrote:
>
> Yup. And... I am probably wrong about the parallel interface. John
> describes it well. I was a comm jock once a long time ago before these were
> made. But I
Yup. And... I am probably wrong about the parallel interface. John
describes it well. I was a comm jock once a long time ago before these were
made. But I don't remember my line-level stuff. It would be normal for it
to be parallel in an internal design like this because it is faster to
drive
Most Arduino kits but the smallest ones (i.e.: Mini) and Raspberry Pi have
enough GPIO pins available to do it without need to resort to serial to
parallel. Of course you can use any of the I2C chips available too. My
philosophy is to adhere as much as possible to the KISS principle.
On
Thank you so much, John! These are very helpful!
On Tuesday, June 4, 2019 at 4:52:24 AM UTC-4, Nixcited delighted wrote:
>
> I now have my displays and the schematic.
>
> I have scanned relevant manual pages, power supply, interconnect, display
> board and component identification.
>
>
This is accurate and great detail. I believe it is simpler than you might
think. This is just a parallel interface (times two).
The work is done with the shifters and the data is pumped via a parallel
interface from the processor as in the original design.
I am just a software guy, but once I
Hi John,
The scans you posted answer all of the questions.
There is no "display controller" as you'd expect from the modern "fruit
machine" displays.
All we have on the board is latches and level shifters.
pins 16,18,19 control a shift register (TL5812) to select the digit
position to display
