File psl-1983/20-kernel/prop.ctl from the latest check-in
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
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