Forgot to post here...16Kx1 DRAM NOS at Goldmine

Hi Chuck, I just reviewed the datasheets. The pinout appears *mostly* compatible - appart from the fact that the 4116 pin 8 wants +12V, and the 4517 only +5V. The other power supply pins have changed to N.C., so it could be done with a small board change or a small wire by each IC. I was just considering that because I have a machine with 64 x 4116 (and maybe some more in two or three other boards, don't want to look now...), and I would be interested in reducing power dissipation. It may go to 170 mW per chip, ... but while MOSTEK say their 4116 needs up to 1 W max, I just see the TMS4116-20 more probably has 462 mW. So it would save me... 19 W at best. Or less, because the unused power rails cannot simple be turned off - or more, because the PSU is a rather large, old, linear type. Now well - I don't have time; the originals are soldered in, so don't want to ruin the boards anyway. Nor change their original state more than needed for actual repairs. I've already replaced one defective IC of these, so I could at least test compatibility... Has anybody ever replaced memory ICs to save power? Btw., I *might* have to stick with 1 bit RAM in this machine because it might mask individual bits in hardware, IIRC. Kind regards, Joerg On 16.01.2013 06:07, cctalk-request at classiccmp.org wrote: -- ------------------------------------------------------------------- Dr. med. J?rg M. Sigle +41-76-276-8694 http://www.ql-recorder.com +41-32-51-22-944 http://www.jsigle.com Have a lovely day... +49-176-964-35413