While no RH750 spec has been found, the spec for Emulex's SC/750 is
online. It provides a detailed summary of the RH750 internal registers.
As I suspected, the RH750 is a subset of the RH780, with lots of status
bits and a register or two omitted. It also adds a mode not present in
the RH780 - ignore byte count mode.
Unfortunately, it doesn't answer the question of how BBS/C works. The
spec says that accesses "should" be done with longword instructions but
doesn't say what happens in other cases - unlike the RH780 spec, which
says explicitly that a machine check occurs.
/Bob
_______________________________________________
Simh mailing list
[email protected]
http://mailman.trailing-edge.com/mailman/listinfo/simh
