20.024 What cable can I use to do Apple IIc <---> PC ADT transfers?
Description
This article is from the Apple II Csa2 FAQ, by Jeff Hurlburt with numerous contributions by others.
20.024 What cable can I use to do Apple IIc <---> PC ADT transfers?
Below is the pinout for a IIc NULL modem cable for use with the ADT disk
image transfer utility. It shows signal names and signal directions.
Both 9 and 25-pin numbering is shown for the PC connector end. For the IIc
plug, DIN-5 pin numbers are listed with 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
Whether the PC Dsub connector is male or female depends upon what it needs to
plug into.
-------------------------
By: Aage Rettvin
I constructed a new shielded five-lead cable with the above pin assignment
setup for a Dsub25 plug with the correct jumpering of pins 6 and 8. This cable
design basically corresponds to the wiring for a standard serial- printer cable
(type: Imagewriter-I).
But, even running under MS-DOS 6.22, the software failed to get
communications going!
During troubleshooting I confirmed that the cable was OK by using
Hyperterm (on the PC) to force a text-file transfer to the ADT "Receive" or
"Directory" wait-state and by sending sample-files from the IIc by issuing a
'send' command from ADT to Hyperterm.
I discovered that the problem was different numbering of the onboard COM
ports in DOS vs. Win98. That is, in DOS COM #1, #2 corresponded to WIN98 COM
#3, #4. Once this was straightened out, everything worked.
ADT is now running at 9600 bps, and I'm producing new disks on the fly!
Really awesome!!
_________________________
By: Rubywand
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