My IBM PCjr utilized this concept with their sidecars. I recall having: 1 Memory expansion sidecar 1 Parallel port sidecar 1 Sound module sidecar 1 Extra power

My IBM PCjr utilized this concept with their sidecars. I recall having: 1 Memory expansion sidecar 1 Parallel port sidecar 1 Sound module sidecar 1 Extra power sidecar (just power insertion to make up for the anemic default power supply) I also had -4 Deskspace - the sidecars made the footprint almost double, it took up a lot of room!