C64Mini – Keyboard Mod

The Bottom Side of the C64 Mini Keyboard

There’s Plenty of Volume – But what switches can be used to put inside the keyboard?

I’m not too worried about the electronics  side right now, there’s plenty of Arduino keyboard emulator tutorials out there.


Simple Button

Looking at the ‘holes’ on the rear of the keyboard, the ones representing the smallest keyboard buttons have a tapered inner

The Smallest inner dimension is 5.1mm x 5.1mm right at bottom of the hole which is at the ‘top’ of the key

The widest dimesion is about 6.6mm x 6.6mm at the base of the key

Outer dimensions are about 8.8 x 8.8mm

Hole depth varies depending on the key locations – from  6.7mm  to 5.4mm

Armed with all this, I can place restrictions on the switch dimensions……The Maximum space available that ALL switches can fit in….Some buttons have a little more, Some less

Individual Button Dimension Restrictions

Summary, To form a keyboard Grid……….I need to find switches that are less than 8.8mm x 8.8mm and less than 10.5mm from the PCB to the top of the switch!

Should be easy enough?



Author: Bleugh

Early Fourties, Wife, two kids in primary school. Both of us work full time...5 years now we’ve been Back in Blighty after a decade away...It's a new country for everyone! Still finding time to tinker!

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s

%d bloggers like this: