MEM11A questions

Mike Ross tmfdmike at
Tue Mar 8 14:44:27 CST 2016

On Wed, Mar 9, 2016 at 8:15 AM, Guy Sotomayor <ggs at> wrote:
>> On Mar 8, 2016, at 11:12 AM, Henk Gooijen <henk.gooijen at> wrote:
>> -----Oorspronkelijk bericht----- From: Guy Sotomayor
>> Sent: Tuesday, March 08, 2016 7:17 PM
>> To: General Discussion: On-Topic and Off-Topic Posts
>> Subject: Re: MEM11A questions
>>> On Mar 8, 2016, at 10:11 AM, Henk Gooijen <henk.gooijen at> wrote:
>>> Guy,
>>> I have one 11/20. CPU state unknown ... but the card cage only has the CPU.
>>> So I would be glad to get some memory.   Plenty of space left for other
>>> interfaces, so the MEM11 would be sufficient for me. 128 KW is probably
>>> overkill. The 11/20 can only address up to 64 KW, correct?
>>> Depending cost, I am seriously interested in one MEM11.
>> The 11/20 can address only 32KW (64KB).  You need an MMU to access
>> more.
>> TTFN - Guy
>> ---------
>> Ah yes, of course Guy!  The 32 kW vs. 64 kB error. I'll never learn ;-)
>> The 11/20 did never have an MMU (AFAIK).
>> Will the MEM11 come in "flavors" regarding the installed amount of FRAM?
>> (32/64/128KW)
> No, it will only have 128KW.  Since it’s a single FRAM part, I’m not going to
> try and “stock” different flavors (especially since I’ll be having the boards
> assembled at the board house).

But you will do something to allow memory to be switched in and out? I
presume this thing wouldn't work in an 11/20 unless it was strapped
back to 32KW? Or will the 11/20 be happy and simply ignore the
unaddressable memory beyond 32KW?

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