Roland is well known for it’s TB-303, TR-808 & TR 909 synths and drum machines, but it also made others in this numeric series: the SH-101, MC-202, and so on. However, it never made a ‘404’ of any sort, which leads me to create this HILARIOUS info-graphic:
Fun extra facts: 'TB' is an acronym for Transistor Bass; TR is Transistor Rhythm and MC is Micro Composer. However, there does not seem to be any consensus on 'SH' - perhaps SyntH??? Shut up, that was fun.