The VAXstation 4000 Model 60, code named “PMariah”,[1] was announced on 30 October 1991 and became available on 25 November 1991. It used the KA46 CPU module containing a Mariah chip set operating at 55 MHz (18 ns cycle time) with 256 KB of external cache. It supported 8 to 104 MB of memory, with SIMMs installed in pairs. SIMMs used were the 4 MB MS44L-AA and the 16 MB MS44-DA, which both had parity. It was the first VAX system to use the TURBOchannel interconnect. The upgrade path was to the VAXstation 4000 Model 96.
