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Subject: Wiring UART 16C552(rs232) to PC (104 Modul) ?

Date: 08/25/99
Posted by: Sven Bode
E-mail: mcsberlin(at)t-online(dot)de(no spam)
URL: http://


Does anybody know, how to connect a UART TL16C552 to an existing PC ? We have a PC 104 Modul, which is a compact PC with AMD 586 CPU and two COM ports on Port. Up to now, we have connected a TL16C552 to the PC-Bus without wiring the reset line of the UART to the reset line of PC-Bus (cause PC gives Reset and UART needs -Reset). Our Adresses are programmed to 3e8 and 3f8 and IRQ are 10 and 11. Trying to test this shows with a TESTING PROGRAMM "TROUBLESHOOTER" first of all: com3 and com4 as: "16550 bad fifo" and the irq's are not 10 and 11. Programm shows for both irq3. So the result is: They don't work !! I will be happy for any hint, you can give me. Ciao Sven -- Sven Bode mcsberlin@t-online.de Tel ++49 30 69 0003 13

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