[lispm]

Lisp Machines had hardware support for GC. That does not mean the GC was a hardware function.

RISC machines were faster than the Lisp processors, but not at the time when both were actively developed and mostly for the smaller benchmarks. At the time RISC processors were appearing, several Lisp chips based on RISC were developed (SPUR, Symbolics, Xerox, ...). They never reached the market, mostly since the AI Winter already set in. Lisp Machine software was then ported as virtual machines to SUN SPARC (Xerox) and DEC Alpha (Symbolics).