I've been searching for what exactly the "in-line" part means but I don't get it. Is it the way the chips are positioned, as in a line? If it is, is there another possible configuration?


1 Answer 1


The "in-line" is about all the contacts being in a straight line on the edge of the PCB.

The SIMM has only actually one set of contacts: the contacts on either side of the PCB are connected.

You can see that on a photo of the slot; there is only one contact for both sides.

SIMM Slot in an ATARI STE source: wikimedia user Wolfgang "Darkoneko" ten Weges

On a DIMM, both sides of the PCB carry one line of different contacts:

DIMM Slot on a PC motherboard, I'd guess. source: wikimedia user Project Keil

  • \$\begingroup\$ The "in-line" in contrast to the previously common DIP and ZIP memory, which was just plain ICs you put in sockets: oldcomputer.info/pc/board_mem/exp1.jpg (Imagine the fun you had if you bent just one of those legs) \$\endgroup\$
    – pipe
    Apr 30, 2021 at 21:44

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