2116 and other old memory chips

I have to disagree ... i2115's are open-drain versions of the tri-state i2125, and both of these are single-supply 1k x 1 SRAMs. If you plug a 2115 into a 2116/2117 application, you'll quickly become aware of the differences since the single-supply 2115's Vcc will be at gnd, and its gnd will be at +12, its nCS will be at -5, and the A5 input will be connected to +5. I would expect the package to pop within less than 10 seconds. I did verify this information from the 1987 Intel Memory Components Handbook. 16K DRAMs were no longer of interest, and, since Intel actually never manufactured them anyway, simply packaging someone else's parts with their brand label, there was no need for them to include the 3-rail 4116-equivalents in their databook. Intel did take a stab at selling (I don't know whether they attempted to build them themselves.) Single rail 16-K DRAMs, the 2118's, which were also touted as the fastest DRAMs on the market at that time. With the rapidly approaching availability of the 4164's, this was a stepping stone to the larger memory arrays that were of great appeal to the users of the new 16-bit CPU's, allowing board makers to design boards with single supplies. However, the Intel DRAM controllers of the 16K era, i.e. the i3242/i3480 combination, didn't deal with mulitiplexing 16 bits of address, so would-be designers of 64K DRAM-compatible memory boards had either to wait for the new generation of DRAM controllers, or to design their own multiplexing/refresh-address-generation logic from TTL SSI/MSI, or perhaps PALs. Dick ----- Original Message ----- From: "Bob Shannon" <bshannon(a)tiac.net> To: <classiccmp(a)classiccmp.org> Sent: Saturday, July 07, 2001 8:48 AM Subject: Re: 2116 and other old memory chips