Cheap and Simple expansion board that only requires
3 to 4 ICs and has been tested for EX and HX machines.
Designed by Adrian Black.
How to put the board together.
If you bypass the 74LS245 with
a jumper you can save one IC.
If you don't want the LED, you
can leave it off as well as R3 .
If you choose to use the 74HCT , you will
just have to replace R1 & R2 with 10kΩ .
Created with KiCAD v5.1.4-1.
The uploaded files are of version 1.2 , with
the fixes, talked about in the Video, applied.