Posted By
JamesC
on 2003-09-03
|  Re: Plus4 User Port
Okay. The ACIA chip (6551) registers run from 64768 to 64783. The RS-232 buffer resides at 1015-1078 (a whopping 64 bytes) . RS-232 flags, counters, and pointers are 1997 to 2008.
The (Merten/Meyer US version of the) Programmer's Reference Guide does not go into detail of the ACIA chip itself other than using 64768 to detect carrier and dial.
Sorry I'm not of more help. 
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