[sdiy] NVRAM for TR606?

[kenny at beatkamp.com]

Hi Brian,

In this specific instance, the Pixie implementation for TB-303, TR-606 
(and I believe
but cannot confirm TR-808) from Paul at RE-303 negates the need for 
external RAM.
This is internalized on the CPU itself. The Pixie is running the 
original Roland
code with a tiny bit of MIDI stuff hung on to it. ie) D650C emulator

Cheers,
./k

On 2023-04-01 01:26, brianw wrote:
> Do you have any data sheets or part numbers for NVRAM?
> 
> Last time I checked, they either have a battery built-in, or they 
> require different code to work with SRAM interface timing. In other 
> words, I don't think you can retrofit. If someone has a part number 
> that would work, I'd like to know how it works.
> 
> The other solutions people are talking about use a new CPU design where 
> the code can handle modern non-volatile memory.
> 
> Brian
> 
> 
> On Mar 31, 2023, at 11:36 AM, antti.s.pitkamaki--- via Synth-diy 
> <synth-diy at synth-diy.org> wrote:
>> I hate leaky batteries. Does anybody know if there is an NVRAM 
>> solution for the Roland TR606? I don’t want to keep batteries in it, 
>> but it looses memory contents without them…
>> 
>> At least for pinball machines some have replaced the original volatile 
>> memory chips with NVRAM equivalents, but googling about a solution for 
>> the TR606 yields nothing.
>> 
>> Cheers,
>> Antti
> 
> 
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