Southwest Technical Products Corporation introduced this bus in November 1975 and soon other companies were selling add-in boards.

This arrangement made for low cost printed circuit boards that did not need gold plated edge connectors.

The tin plated Molex connectors were only rated for a few insertions and were sometimes a problem in hobbyist systems where the boards were being swapped often.

This made for very simple I/O boards, the Motorola peripheral chips connected directly to this bus.

[6] Cards designed using the SS-30 bus often had their external connectors mounted such that they were accessible outside the computer chassis when installed in SWTPC motherboards.