X-Pander 3 Expansion PCB for Commodore Systems

X-Pander 3 opens up extensive possibilities for expanding Commodore 64, SX64, C128, or C128D computers.

Use multiple cartridges simultaneously or easily switch between them without the need to remove them.

X-Pander 3 offers the following features:

• 3 individually selectable expansion ports
• Power indicators for each port
• Ability to swap input/output (IO select) lines on the second and third ports
• Easy-to-access "piano" type configuration switches
• Third port with top or rear loading
• Third port can accommodate 2 cartridges simultaneously
• Reset switch

Both the top and rear loading options for port 3 use one set of configuration switches, requiring the use of 2 cartridges that can work together without configuration.

Design:

https://github.com/go4retro/xpander-3