The 8x41 used the 8x48 instruction set, but rather than having one of its ports, it had an 8-bit bidirectional bus complete with nCS,nWE, and nWR and an interrupt signal back to the bus master. The 8x41 functioned as a slave, allowing the bus master to write to it, or to read from it. They're pretty handy, though not terribly fast. Intel's HPIB bus chips (8291, 8292(?)or so) were a bus master and bus slave which they freely admitted in their databook were merely masked-ROM versions of the 8041. They functioned on the typical 8085 bus or, for that matter, an 8051 bus once the 8051 became available.

Do these Philips chips you mention function in that mode?

I wasn't able raise any information about LPC7xx or LPC9xx at a glance. I'll keep looking of course, as that would be interesting. Nowadays, peripheral chips are sort-of ho-hum, but you never know.

RE