I go to my stash and grab a box and open it up, got this off ebay, who remembers when as a spare...
Hook up the monitor and power supply....
I want to test and see if the Rev 'C' will count memory up to 640K.....
but before I connect the JR-IDE unit to the side connector.. I power up the unit to be sure it works..
and watching the screen I see it counting memory.... 64 128...... 640K !!! What the hell !!!
open the case and look inside, nothing unusual at all....
Decided to just pull the Drive out, releasing the bottom clips, and lifting out the drive,
I see THIS inside !!!!
WOW.... I never saw a HOTSHOT board before, now it is actually hiding in a unit and it works...
would like to hear from anyone that has one and their comments....
What a nice find !! I have 3 other Jr's, wonder if I should open them and peek inside..... (gotta luv this stuff)

Just and UPDATE on REV 'C.
Removed the board and back to the stock 128K, plugged in the REV 'C' and ugh..
No Boot.... but the Display lit up with FE and the decimal dots did a slow flash....
So I am in the troubleshooting mode..... BUT I know Kevin has his working so they are available....
I am hoping to just be a back up source
( but KEVIN...I did make a 3D printed CONNECTOR SQUEEZER for the JR connectors if you are interested I can send the .STL files)
