2026-10-31 20:40 UTC
I like to use Fritzing to plan my breadboard projects
here's my Fritzing layout for the 286 breadboard.
the DIP adapter is represented by a silly-big custom chip.
Fritzing doesn't have an Arduino Giga, but they have a Mega, which has the same GPIO footprint.
I think ultimately I need to move the Giga to the right side of the breadboard, that will let me make all the bus lines shorter.
If I've learned one thing about breadboarding, it's that short is good.
Replies (1)
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@gloriouscow@oldbytes.space 2026-10-31 20:47
We don't want to try to just stick any old 82284 in - we need a CMOS version, since we're clocking things slowly. Luckily 82c284's were made, like this one from Intersil. The 82c284 can take a clock input as X1/X2 crystal inputs, or can can take a simple externally generated clock signal on its EFI pin. How you tie the F/C pin determines which inputs it uses. We'll be letting the Arduino drive the clock via EFI, so we need to use a pull-up resistor on the F/C pin.