Prime 50-Series emulator announcement

[Dennis Boone]

A set of sample system images derived from the public emulators can be 
downloaded from https://yagi.h-net.org/p50em_samplemachines.tar.gz to
get you started.  The tarball is 309078820 bytes, and its sha256sum is
8fe261f7a9f19e9fab2814371387f9cef5c64161fe7cf4bdc542144202678ca9.  We
may rebuild these later and distribute them individually in a more
formal fashion.

De