Took maaaaaaany hours to for tech support to figure out why my $$$ 33.6k external modem worked sloooooooow. Often took them a lot of convincing that it was actually slow, a lot of early internet users had higher expectations, but I was coming from 2400bps service. Bazillions of failed packets reported in Windows Dial Up Networking.
Finally found the person that figured it out. Computer only had an 8250 UART for the serial port. $35 ISA serial port card with 16550A UART solved it!
Finally found the person that figured it out. Computer only had an 8250 UART for the serial port. $35 ISA serial port card with 16550A UART solved it!