Brother HL-660 Series User Manual page 40

English
USER'S GUIDE
4–4
This printer can accept the following types of SIMMs;
Speed 60 nsec - 80 nsec
Pin Type 72 pin
Height 45.72 mm (1.8") or less
Output 32 bit or 36 bit
Note
The printer has only one slot for SIMM, therefore if you want to increase
your printer memory again after you have installed a SIMM module into
the slot, you will need to remove the previously installed SIMM first. For
example if you have previously increased your memory from the standard
2MB to 4 MB by adding a 2MB SIMM and you wish to increase your
total memory to 6MB, you need to remove the installed 2MB SIMM and
install the new 4MB SIMM into the printer.