Apple 640 manual Installing or replacing a Simm for the PC environment

4 Align the card over the communication slot.

Vertical plate
Communication	Communication slot
port access hole

5Press down on the card until the connector is solidly in place.

Don’t force the card. If you meet resistance, pull the card out and try again.

To see if the card is properly connected, lift it gently. If it resists and stays in place, it’s connected.

Installing or replacing a SIMM for the PC environment

Your computer may have come with a SIMM (memory module) already installed on the DOS-compatibility card inside your computer. The SIMM provides memory for the exclusive use of the PC environment. (See the Technical Information booklet to find out whether your computer has such a SIMM installed.) To replace the SIMM with a SIMM of greater capacity, or to install a SIMM if you don’t already have one installed, follow the instructions in this section.

Note: The SIMMs used by the DOS-compatibility card are the same 72-pin SIMMs used to expand memory in your Macintosh. They are interchangeable.

Installing an Expansion Card or Memory for the PC Environment 141