The values for LaserWriter 4/600 PS in 'DBFile' are for the
memory upgrade to 6 MB. Without upgrade your printer has 2 MB
memory. Then the correct value for FreeVM is 481544 and for
ADORamSize 2097152.

The values for Personal LaserWriter 320 in 'DBFile' are for the
memory upgrade to 8 MB. With upgrade to 4 MB the correct value
for FreeVM is 2191632 and for ADORamSize 4194304. Without upgrade
your printer has 2 MB memory. Then the correct value for FreeVM
is 425600 and for ADORamSize 2097152.