File psl-1983/20-kernel/prop.ctl artifact 0ac3eb7796 part of check-in 09c3848028

define DSK: DSK:, P20:, PI:
S:DEC20-CROSS.EXE
ASMOut "prop";
in "prop.build";
ASMEnd;
quit;
compile prop.mac, dprop.mac
delete prop.mac, dprop.mac