Core memory emulator using non volatile ram.

[Rod G8DGR]

All very interesting.. 1201 alarm while I deal will all of the information
Rod


Sent from Mail for Windows 10

From: systems_glitch via cctalk
Sent: 15 December 2018 16:40
To: Anders Nelson; General Discussion: On-Topic and Off-Topic Posts
Subject: Re: Core memory emulator using non volatile ram.

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 at 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 at 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-bounces at 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
> >
>