brouw@dutesta.UUCP (Gerard Brouwer) (02/29/88)
Four weeks ago I posted the following message. However I was unable to
read (if there were any) the replies, so I decided to post it again.
Here is the message again:
The newsgroup 'comp.sys.cbm' contains a lot of information for the
C-128 and C-64 computers. I wondered if there are also users of
different types of Commodore-computers, especially the family of
C-116, C-16, C-232 and Plus4.
I find it difficult to get detailed information about this family,
so here are my questions:
- I want to use the User-port of the Plus4 for I/O.
There are two parts:
Part 1: RS-232 interface connections.
Part 2: 8 databits and other connections.
The 8 databits are easy to program for output:
LDA <data>
STA $FD10
But what about input?
Is there a Data Direction Register (like a C-64)?
- What is the influence of the ACIA to the User-port?
The ACIA has four registers:
1 - Command register
2 - Status register
3 - Data register
4 - Error register (?)
I know these registers are used by the RS-232 routines, but I
don't know what they really do. Who can help me??
- Is there a 'Programmer's Reference Guide for the Plus4' available
just like the 'Programmer's Reference Guide for the 64'?
- Where can I get circuit-diagrams of these computers?
I would appreciate it, if someone could help me. If you have information
you can 'e-mail' it to me or post it to me by physical mail.
Thanks for your cooperation.
Gerard Brouwer
P.O.-Box 4117
3102 GC Schiedam
The Netherlands
E-mail: brouw@dutesta.UUCP