Reading about the Amico system inspired me this week.

Looking at all the specs I could find, I think it's possible that I add support for not only the Intellivision controllers and ECS Keyboard, but also the Colecovision controller.

Based on this image of the Cvision controller, it looks like all the switches are in the Boehm, but I'll have to spread each Colecovision controller across to Boehm ports because there are so so so many diodes.

https://i1.wp.com/www.retronicdesign.com/wp-content/uploads/2014/11/ColecoController.jpg

Fortunately, I think I can fit all the diodes into the conversion cable.

Like the Intellivision controller and ECS keyboard, the Colecovision controller doesn't offer a power pin, so Boehm support can't be backpowered like it can potentially be on the Atari.

Atari 2600 - support: 2 x Single Fire Button JS Controllers, or 4 x Paddles, or 2 x Keypads, or 2 x Hypothetical Controllers

Atari 5200 - support: 4 x 5200 Controllers, or Hypothetical Keyboard similar in style to the Intellivision ECS keyboard (Requires all 4 MrBoehm ports).

Atari 7800 - support: All of the 2600 controllers, and 2 x 7800 two-button JS/Gamepads

INTV/INTV2 - support: 4 x Game Controllers (2 with standard ports plus another 2 with the ECS), or 1 x ECS Keyboard (Requires all 4 MrBoehm ports)

ColecoVision - support: 2 x Game Controllers (Requires all 4 MrBoehm ports)

The 2600/7800 will use the same conversion cables

The 5200 will use 5200 extension cables

The INTV will require its own conversion cable with a 9-pin horizontal connector, different from the INTV2 9-pin DSUB connector. 2 x Cables for just the console, plus 2 x Cables if ECS is used.

ECS Keyboard will require 4 port to 2 port conversion cable.

ColecoVision will require 4 to 2 port conversion cable.