15 Dec
2018
15 Dec
'18
2:19 a.m.
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
15 Dec
15 Dec
7:37 a.m.
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/FM16W0…
32K x 8 - $19.54 (qty 1):
https://www.digikey.com/product-detail/en/cypress-semiconductor-corp/FM18W0…
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
8:11 a.m.
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/FM16W0…
32K x 8 - $19.54 (qty 1):
https://www.digikey.com/product-detail/en/cypress-semiconductor-corp/FM18W0…
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
8:38 a.m.
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/FM16W0…
> 32K x 8 - $19.54 (qty 1):
https://www.digikey.com/product-detail/en/cypress-semiconductor-corp/FM18W0…
> 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
8:45 a.m.
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/FM16W0…
> 32K x 8 - $19.54 (qty 1):
https://www.digikey.com/product-detail/en/cypress-semiconductor-corp/FM18W0…
> 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
1980
days inactive
1980
days old
4 comments
5 participants
participants (5)
-
alan＠alanlee.org -
anders.k.nelson＠gmail.com -
pbirkel＠gmail.com -
rodsmallwood52＠btinternet.com -
systems.glitch＠gmail.com