kodak80 blog

[kodak80]

RJ12 connectors arrived and so have tested 5V and GND were showing on the right locations on the adapter. Looks like TX and RX are wired correctly as well.

CKBD adapter with my Mega ST is now tested and USB devices work. Dell Keyboard and Microsoft Basic mouse both work fine.

Eiffel Mega ST Adapter 001.jpg (234.3 KiB) Viewed 1550 times

Eiffel Mega ST Adapter 002.JPG (229.96 KiB) Viewed 1550 times

[kodak80]

Moving on from my initial CKBD adapter for my Mega ST which is effectively an Eiffel adapter without the PIC chip. It was time to integrate the new CH559 chip onto the PCB.

Eiffel recreated 2025 v1.1a_2025-11-01-top.png (382.16 KiB) Viewed 1120 times

Apart from getting the TX and RX connected the wrong way round, it works.

All ports tested and working. Ended up with wireless keyboard and mouse connected to the USB ports on my Mega ST.

[agranlund]

All ports tested and working. Ended up with wireless keyboard and mouse connected to the USB ports on my Mega ST.

Awesome!

[atari030]

That's pretty neat. Nice one.

[kodak80]

I think I now have my Mega ST CKBD adapter where I want it.

USB wireless keyboard
USB wireless mouse
UniJoysticle2 Bluetooth joystick with my Xbox controller connected

Totally wireless connectivity - no wires getting in the way.

Here is the final adapter

Eiffel CKBD 2025 v2.1 built.jpg (262 KiB) Viewed 918 times

[tOriman]

Excellent Job!

tOri