The QUAD had the potential of being a handy diagnostic tool.and it failed.it started as a wrist mounted DOITALL that never went into production.It was reencarnated and became a hodgeoodge of available integrated chips and swiches that did’nt work well.then a group of well meaning people, who had purchased this device(like me) dreamt of a hand held 2 trace dual digital input precision oscope.
The problem with this tale is there will probably be no happy ending.
The thing is that it’s software and who knows.