Posted By
dmantione
on 2022-09-06
04:48:48
|  Re: External User Port for the C16: Let's make it!
In the 6551 datasheet, the RTS, DTR, DSR and DCD have a line above them, which means they are active low. Could it be that Commodore's VIC-1011A expects them active high, so they had to be inverted to be compatible with the VIC-1011A?
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