BTW, I think I found out why the MMU requires the SLR. The SLR is not operative in User mode. I haven't checked out the circuitry to see exactly what the interaction is, but it has to be something associated with that. Actually, it will work with a KW11-P, too; those are actually more commmon than the KW11-L's, I've found. But as Guy pointed out, the DL11-W will do too - and those are _very_ common (since they were used in the 11/34's, etc). Noel