[cctalk] Re: Classic computers with more than one stack pointer, but not FORTH machines.

[Chuck Guzis via cctalk]

Don't know if it was mentioned, but the NS16032 (later renamed to
NS32016) employed two stack pointers (SP0 and SP1), but the
implmentation was one for user stack and the other for interrupts.
Which only made sense--you don't want your privileged-mode ISRs
corrupting the user stack or vice-versa.

--Chuck