1. cable to connect Apple Printer to PC Serial port
Thanks to B. Joshua Rosen for the information you sent me a few months back...
I'm about to start cuttin up cables and soldering them to make the adapter I
need.
However, before I really get down to soldering, and before I connect the printer
and computer, I wonder if somebody has done this before, and can judge whether
this is right or disastrously wrong...
OK, Macintosh pin-out:
8 7 6
5 (9) 4 3
2 1
(9 +5 Volts, only for GeoPort)
8 Rx Data
7 Not Connected
6 Tx Data
5 Rx Data (inverted)
4 Ground (is this "Signal Ground" ?)
3 Tx Data (inverted)
2 CTS
1 DTR
Shell
Does "inverted" mean that this line is the opposite to the corresponding Tx or
Rx line?
By this, I mean that line 3 goes to -5 v when line 6 goes to +5 v?
Can I simply ignore the inverted lines?
PC pin-out:
1 2 3 4 5
6 7 8 9
9 Ring (what's that? Modem incoming call?)
8 CTS
7 RTS
6 DSR
5 Signal Ground
4 DTR
3 Tx Data
2 Rx Data
1 DCD
Shell
So, I crossover the Tx Data and Rx Data so the PC Tx line goes to the Pitner's
Rx line, and all other lines get connected "as-is", right?
Meaning,
Mac line <--------------------> PC line
8 Rx Data Tx Data 3
6 Tx Data Rx Data 2
4 Ground Sig Ground 5
2 CTS CTS 8
1 DTR DTR 4
Shell Shell
ignoring the other lines...
--
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++
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