It's not just slower speed; all the old Motorola DOS RSS expect the serial port to be using a processor in REAL mode (actual DOS, hardware control of the serial port) not PROTECTED mode (serial port controlled by/mapped through Windows).
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Short of a computer with a real serial port running real DOS, two things you can try:
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1)? On the HamVOIP website is a link to instructions for setting up a Raspberry Pi to do some sort of emulation that actually works with some of the Motorola DOS programs. I found the service screens (tuning) to be flaky but I was at least able to program a GM300 and a Maxtrac with it, using my Sabrent FTDI serial-USB thingy and a RIB box/cable.
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2) There's a new fork of DOSBox call DOSBox-X on Github? It claims to have much more granular control of processor speed and serial port control but I have no experience with it yet. It may or may not deal with the fundamental underlying problem.
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If you just need to get frequencies into a Maxtrac, the thing on HamVOIP is probably your best bet.
