There's always the option of Interlnk if one has PC DOS 5.02 or later, or
The 6300 came with 2.11 and there was an upgrade to 3.2.3 IIRC.
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From: Steve Nickolas <email@example.com>
Sent: Sun, 23 Jun 2019 22:06
Subject: Re: [TUHS] Floppy to modern files for Usenet maps