Thanks for replying, but that doesn't answer the question why they stopped making them.
SIMM= Single Inline Memory Module
DIMM= Dual Inline Memory Module
Dual > Single. Also, I imagine it would be time consuming to install 4GB or so of RAM in 1MB increments, even if some folks might find each one easier to install.
Also, I've never had to push down very hard to insert SDRAM, DDR, or DDR2 Memory. If you leave the little hook things up when you go to insert it that might make it tough. Also, the only SIMM modules that I've dealt that did that little "push back insertion" were actually a bigger pain in the *censored* then the SDRAM or DDR that I used later on. (I speak of a 40 Mhz 386 and a 120Mhz 486DX2 that had SIMM slots, as well as an SB AWE32 that has them in fact I think the 486 had them sit upright just like the SDRAM.
The main reason I would imagine is that DIMMS generally have chips occupying both sides of the card, meaning you can't have a "fold back" type insertion since either the memory wouldn't fit (the chips on the back would prevent it locking into place) or the chips on the bottom will have 0 airflow and circulation. temps weren't an issue with SIMM modules but with DIMM (especially the later ones) those things started to get toasty.