hello there
I made it possible to use SPI SRAM. Use the D5 pin.
SRAM is stored on the back of the LCD screen.
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@te3game, congratulations, this is very innovative! 
You’ve just earned a couple of badges.
Can you share some code or examples with us? What are you using the SRAM for?
I used “23LCV512-I/SN” of Microchip.
It has a capacity of 64 KByte.
Of course it is possible to share code and examples
Currently only the explanation of Japanese.
(I will take some time as I am not good at English, maybe)
Although it is not enough yet, I released a brief explanation and dedicated library.
One example is also included.
Please ask me anything unclear in this matter 
https://sites.google.com/site/sugarflowerrn/buino/external-spi-sram
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