HL-1850:

This printer has 16 Mbytes of standard memory and one slot for optional expansion memory. The memory can be expanded up to 144 Mbytes by installing a commercially available dual in-line memory modules(DIMMs).(The standard memory installed varies depending on the country where the printer is purchased.)

HL-1870N:

This printer has 32 Mbytes of standard memory and one slot for optional expansion memory. The memory can be expanded up to 144 Mbytes by installing a commercially available dual in-line memory modules (DIMMs). (The standard memory installed varies depending on the country where the printer is purchased.)

This printer uses memory modules that are: 100 pins, no-parity, SDRAM with 8 Mbytes or more. This printer is not compatible with Extended Data Output (EDO) DIMM, or DIMM that uses 2 Mbytes SDRAM.

To see how to install additional memory, click here.