Apple IIc pinout summary

[scsmith@apgea.army.mil (Smith S. Charles <scsmith>)]

Greetings,

	I posted a few days ago asking about the serial pin out's for
the Apple IIc.  I got the cable made and my IIc, Kermit-65, and a Baud
Bandit modem are all working together well.

	I want to thank Phillip "Ty" Young who suggested gophering to
University of Minnesota.  I found what I needed there, and a lot of
other interesting information.  Below is an excerpt of the file on
serial ports.

> Apple IIc: Printer And Communication Ports Pinouts
> 
> PINOUTS
>  
> The serial ports on the Apple IIc are standard 5 pin DIN, however,
> they are not labeled as standard DIN.  Therefore, when looking at the
> back of the Apple IIc, the pinouts are as follows:
>  
>  
>  5 Pin DIN    Position      Signal Name
>  
>     1........ 4 O'Clock ... Data Terminal Ready
>     2........ 5 O'Clock ... Transmit Data
>     3........ 6 O'Clock ... Signal Ground
>     4........ 7 O'Clock ... Receive Data
>     5........ 8 O'Clock ... Data Set Ready
>  
> PINOUT EXPLANTION
>  
> Pin 1 (DTR) becomes active when the IIc is ready to go on line.
>  
> Pin 2 (TD) conveys serial data sent from the IIc.
>  
> Pin 3 (SG) is used to provide a common ground reference for the
> electronics in both the IIc and the device it is connected to.
>  
> Pin 4 (RD) receives serial data sent from the device to the IIc it is
> connected to.
>  
> Pin 5 (DSR) is asserted by the device the IIc is connected to when it
> is ready to go on line.


	Also Dave, ddkilzer@iastate.edu, sent me two articles that had
been previously posted to comp.apple2.com.  They added this
information.
	

> The cable you use to connect to the modem will vary, depending on what
> type of modem you have, and which flow control functions you require.
> 
> The following is a standard IIc modem cable, with no data handshaking.
> If the IIc drops DTR, the modem will hang up or enter command mode
> (depending on its AT&D setting).  The IIc's incoming flow control line
> will indicate the modem's presence (DSR).
> 
> IIc (DIN-5)      Modem (DB-25)
> 1 DTR            20 DTR
> 2 TxD            2  TxD
> 3 Ground         7  Ground
> 4 RxD            3  RxD
> 5 DSR            6  DSR
> 
> An alternative is to connect the IIc's DSR line to the modem's DCD pin
> (8), which allows the IIc to detect whether the modem has carrier.
> 
> A third alternative should be used with a high-speed modem which
> requires hardware handshaking.  Connect IIc's pin 1 (DTR) to modem pin
> 4 (RTS) and IIc pin 5 (DSR) to modem pin 5 (CTS).
> 
> 
> The exact cable you use will depend on the communications software (and
> device driver, if appropriate).


	My modem has a standard 25 pin connector and the cable looked
like this.

		5pin Din for IIc		25 for modem

		1				 6
		2				 3
		3				 7
		4				 2
		5				20

And that works fine for me.

	I tried to configure the serial port with the Utilities disk
but I found out that kermit-65 did a better job than I did.  I also
had to turn the parity off on the modem.  To do that I set S23 to
55 with an AT command.  Then I was able to down load files.


thanks,
chuck

--
Sidney C. Smith		
2000 Angle Side Road		scsmith@apgea.army.mil
Fallston MD  21047