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Re: Problem with Apple IIc null modem
"Your name" <underwood.jay@comcast.net> wrote in message
news:Xns94369BC63C27624@63.240.76.16...
> Hi,
>
> I am having a problem getting a null modem to work between my Apple IIc
> and my laptop PC. I hope someone can help me solve this problem.
>
> I want to use the null modem to run ADT, but I keep getting I/O errors in
> ADT. I created my null modem cable according to the following pinout:
>
> DIN-5, male DB9, female
> (Apple)
>
> 4 (2) TXD --> 2 RXD
> 5 (4) RXD <-- 3 TXD
> 2 (3) GND --- 5 GND
> 1 (1) DTR --> 6 DSR --, pins 6 and 1 connected by jumper
> 1 DCD --'
> 3 (5) DSR/DCD <-- 4 DTR
>
> The pin numbering that I used for the DIN-5 connector, as viewed by
> looking at the pins on the front, are:
>
> Apple numbering Standard numbering
>
> 1 5 1 3
> 2 4 4 5
> 3 2
>
> The pin numbering that I used for the DB9 end of the null modem cable, as
> viewed by looking at the front of the female connector, are:
>
> --------------
> \ 5 4 3 2 1 /
> \ 9 8 7 6 /
> -------
>
> This is what happens when I install the null modem cable, and I boot up
> Windows 3.11 (on the PC) and ProDOS (on the Apple IIc).
>
> If I type IN#2 on the apple, I can enter text in a terminal emulator and
> the text will display perfectly on the Apple IIc monitor.
>
> However, if I type PR#2 (print to the serial port) when I type something
> on the Apple, I get gibberish on the teminal emulator (ion the PC sode).
> The gibberish looks like this:
>
> ����ç??������� �����?�Ý?Ý?Ý?Ý?Ý?Ý?Ý?Ý?Ý?Ý?Ý?�
> �Ý?Ý?Ý?Ý?Ý?Ý?Ý?Ý?Ý?Ý?Ý?�ì»?�������� �����?��ì»?�������� �����?��ì»?��
> ������ �����?��ì»?�������� �����?��ì»?�������� �����?���ê??�
> ������ �����?������������������������������������������������������������
> ��������������������������������������ô??¿ï¿½ï¿½ï¿½ï¿½ï¿½ï¿½ �����?�Ý?Ý?Ý?�����ê??�
> ������ �����?�����������������è??������ �����?���������������������������
> �����������������������������^�������������������������������������������
> ������ê??������� �����?��
>
> The serial port settings on both sides are the same, and I'm running at
> 300 baud.
>
> Does anybody know what I am doing wrong, ar have a suggestion that will
> help me. It appears that I can send text from the PC to the Apple IIc,
> but CANNOT send text from the Apple IIc to the PC.
>
> Any help would be greatly appreciated.
>
> thanks,
> Jay
Here is what I found in the FAQs. I have my wiring
on my computer somewhere and will post it when I find
it again. I'm going to need it too. I make these for others.
"Shorting" here just means the pins are connected by a jumper. (For
example, on the 9-pin connector you would jumper pins 1 and 6. The line
coming from pin 1 of the 5-pin DIN connector would connect to either of the
jumpered pins.)
Let's list the French file://c NULL modem cable for ADT showing all
signal
names and signal directions. (The DIN-5 connector shown is the plug on the
cable.) I'll put traditional Apple pin numbers in parenthensis ...
DIN-5M Dsub9 or Dsub25
(Apple) 9 pins 25 pins
4 (2) TXD --> 2 RXD 3 RXD
5 (4) RXD <-- 3 TXD 2 TXD
2 (3) GND --- 5 GND 7 GND
1 (1) DTR --> 6 DSR --,* 6 DSR --,*
1 DCD --' 8 DCD --'
3 (5) DSR/DCD <-- 4 DTR 20 DTR
* pins connected by a jumper
Usual Apple numbering for a male cable connector (plug) as viewed
looking at the pins from the front is ...
1 5
2 4
3
Showing only the usual Apple numbering and a Dsub9 connector going to
the PC, the French file://c ADT NULL modem cable pinout would be ...
Apple Dsub9
"DIN-5M" 9 pins
2 TXD --> 2 RXD
4 RXD <-- 3 TXD
3 GND --- 5 GND
1 DTR --> 6 DSR --,*
1 DCD --'
5 DSR/DCD <-- 4 DTR
* pins connected by a jumper
Whether the Dsub9 connector is male or female depends upon what it
needs
to plug into.
Bill @ GarberStreet Enterprizez };-)
Web Site - http://garberstreet.netfirms.com
Email - willy4SPAM6pa@comXcast.net
Remove - SPAM and X to contact me
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