Core memory emulator using non volatile ram.

Guy Sotomayor Jr ggs at
Sat Dec 15 22:23:23 CST 2018

> On Dec 15, 2018, at 7:09 PM, allison via cctech <cctech at> wrote:
> On 12/15/2018 01:01 PM, Guy Sotomayor Jr via cctech wrote:
>> FRAM or MRAM.  I make extensive use of them in my projects.
>> Everspin has a few (all SMT and 3.3v).  As I recall they run ~$20/ea for 4Mb (512K x 8 or 256K x 16).
>> TTFN - Guy
>>> On Dec 15, 2018, at 1:22 AM, Rod G8DGR via cctalk <cctalk at> wrote:
>>> 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
>   Flash, EEprom and Magnetic FRAM and MRAM) types
> have many unacceptable
> properties for a random access read write memory. 

I think you’re mistaken about FRAM and MRAM.  They are byte oriented devices
and are designed to replace SRAM + battery.  Which in my mind makes them
preferable as they reduce parts count.  The current MRAM has unlimited write
endurance (same as SRAM) and depending upon the part is 35-55ns access/cycle
time.  FRAM has a similar access time but requires an internal restore so it’s cycle
time is about 2x (one of the reasons I prefer MRAM now).

TTFN - Guy

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