At the end of the day, the only example of successful QB30 hacking I could find was in the documentation of the obscure product Door Patch v3.7, apparently a collection of functions to create “BBS doors” in BASIC. In the readme attached to the archive, programmers Jeff Porter and Clint Labarthe describe how to patch the BRUN30.EXE runtime to make it keep the DTR signal of the serial port always active:
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