At the time, I was using my Amiga for dial-up internet, and sharing that connection to the LAN for other machines. The fast serial port helped that a lot - before that, the Amiga's serial port was the bottleneck, whereas with the faster ports, the modem was the bottleneck instead and CPU load was reduced too. It was also useful for null modem connections, being able to sustain a 115K connection without problems. Similarly with the parallel port, at the time I had a parallel inkjet printer, and the new port was much faster for printing as well as reducing CPU load. It also freed up the internal parallel port for driving a small LCD display I installed in my tower.
Yep, the Catweasel really was excellent and got a lot of use at the time for floppy transfers.
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