ARAM Write Enable Flag

The ARAM Write Enable Flag is bit 1 of the S-SMP's TEST register (00F0h):

• When set, the S-SMP and S-DSP can both read and write to ARAM.
• When clear, they can only read ARAM.

Reference

• https://problemkaputt.de/fullsnes.htm#snesapuspc700ioports