On 10 Apr 2021, Rick Smith said the following...
I spent a bit of the day moving mystic hpt and binkd to my manjaro pi
and when a ll done mystic wouldnt start... Just realized that there is
no 64bit pi version of mystic.. any chance there will be or should I
scrap the project?
the whatsnew.txt file in a47 says it's been ported to arm64 but i don't see a package for it. perhaps try the mystic base on fidonet?
--- Mystic BBS v1.12 A47 2021/04/08 (Windows/32)
* Origin: cold fusion - cfbbs.net - grand rapids, mi (21:1/616)