Maybe there's some practical use for this: it looks like 3B computers are still used in some AT&T POTS telephone switches: https://en.wikipedia.org/wiki/5ESS_S

Maybe there's some practical use for this: it looks like 3B computers are still used in some AT&T POTS telephone switches: https://en.wikipedia.org/wiki/5ESS_Switching_System#Administrative_Module https://en.wikipedia.org/wiki/5ESS_Switching_System#Administ... https://en.wikipedia.org/wiki/No._4_Electronic_Switching_System#File_store_and_CNI_ring https://en.wikipedia.org/wiki/No._4_Electronic_Switching_Sys...