Re: serial port apple 2c

[bharrisnospam2391@vax2.winona.msus.edu]

Marius Diepenhorst (pokey) wrote:
> 
> Hmmm some reactions, but unfortunately not very handy for me :-((
> 
> The only thing I have is a printer cable (5pin DIN -> 25 pin rs232)...
> 
> I tried to connect a pc with a PC-nullmodemcable connected to that 25pin
> rs232 printer slot, but it didn't work at all (!).
> 
> I like to know the pinout of that 5 pin serial port of the Apple 2c... who
> knows?
> 
> And isn't the printer-cable 'compatible' with a stock apple-2c-modemcable?
> 
> Greetz. Marius

One would think that the printer cable and the modem cable for the Apple
IIc would be the same, since they both use a serial interface.
Since I don't have a IIc, I don't have any manuals with the Apple IIc's
pinouts.  However, they should be the same as a Laser 128.  Here is the
pinout for the 128's serial interface.  
     
     ----
  /        \    1. DTR - data terminal ready  to 
                2. TD - transmit data            
 |o 5     1o|   3. ground                        
   o 4   2o     4. RD - receive data             
  \   o3   /    5. DSR - data set ready          
     ----

Since my (PC) computer has a db9 port for a serial port, I don't have a
diagram for you.  However the pinouts for the 25 pin port should be:

  8       DCD (Data Carrier Detect)
  3       RX  (Receive Data)
  2       TX  (Transmit Data)
  20      DTR (Data Terminal Ready)
  7       GND (Signal Ground)
  6       DSR (Data Set Ready)
  4       RTS (Request To Send)
  5       CTS (Clear To Send)
  22      RI  (Ring Indicator)

So, I believe...
Apple IIc (5pin)  IBM (25 pin) 
     1<--------------->6
     2<--------------->3
     3<--------------->7
     4<--------------->2
     5<--------------->20
             ... should do it.  Then you'd a copy of ADT, or teminal
programs on both ends to do the transfer.  ADT can be found here:
ftp://mirror.apple.asimov.net/pub/apple_II/utility/adt121.zip

Hope this helps.