Another vote for RAMtron/Cypress FeRAM. I've used their FeRAMs in a number of systems, here's a writeup on my "core board" for S-100:
http://www.glitchwrks.com/2016/03/29/ferroelectric-ram-part-1 I've got a bunch of FM18W08s in stock if you need one, I can stick it on a DIP adapter if needed. One thing to be aware of, RAMtron FeRAMs latch the address bus when *CS goes low, so make sure everything's set up before *CS goes low. Thanks, Jonathan On Sat, Dec 15, 2018 at 11:11 AM Anders Nelson via cctalk < cctalk@classiccmp.org> wrote: > Texas Instruments' MSP430 MCUs use FRAM. This one for example: > http://www.ti.com/product/msp430fr5969 costs ~$2.30. > > You could do some emulation in the same package, too. Not sure what your > speed requirements are of course! > > =] > -- > Anders Nelson > > +1 (517) 775-6129 > > www.erogear.com > > > On Sat, Dec 15, 2018 at 10:37 AM alan--- via cctalk <cctalk@classiccmp.org > > > wrote: > > > > > Ramtron had most of the patents on Ferroelectric RAM in the past. > > Cypress acquired them many years ago. > > > > New production FRAM is still sold on Digikey - in 5V SOIC packages. Not > > cheap though: > > > > 8K x 8 - $12.72 (qty 1): > > > > > > > https://www.digikey.com/product-detail/en/cypress-semiconductor-corp/FM16W08-SGTR/428-3774-1-ND/6181520 > > > > 32K x 8 - $19.54 (qty 1): > > > > > > > https://www.digikey.com/product-detail/en/cypress-semiconductor-corp/FM18W08-SGTR/428-3775-1-ND/6181516 > > > > Completely non-volatile. Faster than most SRAM of the day (130ns cycle > > time). And good for 100+ trillion write cycles and more than a century > > of endurance. > > > > -Alan > > > > > > On 2018-12-15 05:19, Paul Birkel via cctech wrote: > > > Perhaps Cypress FM1808 (32Kx8). Obsolete, but available on eBay. SOP > > > for a bit of extra challenge! > > > > > > -----Original Message----- > > > From: cctech [mailto:cctech-boun...@classiccmp.org] On Behalf Of Rod > > > G8DGR via cctech > > > Sent: Saturday, December 15, 2018 4:22 AM > > > To: General Discussion: On-Topic and Off-Topic Posts > > > Subject: Core memory emulator using non volatile ram. > > > > > > I have an idea to produce an MM-8 clone using RAM that acts like core > > > when turned off. > > > Can anybody suggest a chip that will do this? > > > > > > Rod Smallwood > > > > > > > > > Sent from Mail for Windows 10 > > >
