Universal Pascal Code. Intermediate language, a generalisation of P-code for easier optimisation. Developed originally for the Los Alamos Cray-1 and the Lawrence Livermore S-1. A refined version currently used by MIPS compilers is descended from one at Stanford U. "Machine Independent Pascal Code Optimisation", D.R. Perkins et al, SIGPLAN Notices 14(8): 201-201 (1979). "A Transporter's Guide to the Stanford U-Code Compiler System", P. Nye et al, TR CSL Stanford U, June 1983. (See HPcode).