This gitlab project can be used to allow SSH access to any telnet BBS! 1.0.48 just had a modified command (--filter-no (or was it --no-filter?)) added to allow for z-modem transfers!
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Shurato, Sysop Shurato's Heavenly Sphere (ssh, telnet, pop3, ftp,nntp,
,wss) (Ports 22,23,110,21,119,999)
*** THE READER V4.50 [freeware]
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* Origin: Shurato's Heavenly Sphere
telnet://shsbbs.net (618:300/50)