George Friedman, Massachusetts Institute of Technology,

Cambridge, Massachusetts

When assembling programs, PALDT requires that the symbolic

tape be read in only once. The program writes on the library

tape itself after finding the next available block from the

directory. During pass 0 the tape is read in using the entire

user's symbol table. During passes 1,2,3, as much of the

symbol table is used as possible. This means the fewest tape

passes as possible. As an added advantage pass 0 ignores

blank tape, leader-trailer, line feeds, form feeds, and

rubouts; saving space. The whole program decreases the users

symbol table by only three pages: one for the DECtape

program above, one for pass 0, and one for the minimal

length read-in buffer.