Posted By
jet_morgan
on 2003-09-03
|  Plus4 User Port
Has anybody the addresses in decimal for the Plus4 User Port in particular Data Port B and the Data Direction Register ( DDR ) ?
Thanks in advance,
BWM.
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Posted By
JamesC
on 2003-09-03
| Re: Plus4 User Port
The address 64784 comes to mind but I wouldn't swear to it. I will check my PRG when I get a chance later today to verify.
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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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Posted By
jet_morgan
on 2003-09-04
| Re: Plus4 User Port
Thanks for the reply.
Every piece of information helps.
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