Re: Need Help With Wiring from SSC

[tmmadden@umich.edu (Tom Madden)]

Thanks a bunch!

It turns out the custom replacement cable had two bad solder joints that
connected cable coming from the SSC to the 25-pin connector on pins 1 and
2. 15 minutes with an iron and a desoldering bulb made my IIe well again!

-Tom



In article <3AC3E3C5.28338E8A@nowhere.net>, noone@nowhere.net wrote:

> Tom:
> First thing you should do is test the two ports, the PC side and the
> Apple II side.  Put both computers into terminal mode.  Use a paperclip
> and short holes 2 and 3 together and type.  If you get the characters on
> the screen, the send and receive work on that computer.  If both
> computers show good transmit and recieve, then it is your cable that is
> not quite right.  Of course I'd immediately suspect one of the
> handshaking lines didn't get crossed.
> 
> If the IIe is actually not sending out, replace the 1488 chip at A6.
> 
> Assuming you look at the end of the SS card where the cable plugs in,
> right side up, there is a black plug, rectangle 10 pins which I will
> number as follows.
> 1 2
> 3 4
> 5 6
> 7 8
> 9 0
> 
> DB25s are normally numbered front and back, gender is irrelevant.  The
> Signal labels assume the SSC is in the MODEM mode.
> Apple SSC to DB25
> 1 brown  1  ??
> 2 red    2  TX
> 3 orange 3  Rx
> 4 yellow 4  RTS
> 5 green  5  CTS
> 6 blue   6  DSR
> 7 purple 19 ??
> 8 grey   7  GND
> 9 white  20 DTR
> 0 black  8  CD
> 
> Proper Null modem Wire DB25 to 25
> Tx     2   - 3   Rx
> Rx     3   - 2   Tx
> RTS    4   - 5   CTS
> CTS    5   - 4   RTS
> DSR&CD 6&8 - 20  DTR
> GND    7   - 7   GND
> DTR    20  - 6&8 DSR&CD
> 
> Proper Null modem Db25 to 9
> 2   - 2   RX
> 3   - 3   TX
> 4   - 8   CTS
> 5   - 7   RTS
> 6&8 - 4   DTR
> 7   - 5   GND
> 20  - 6&1 DSR&CD
> 
> Thankx,
> Ed
> eeastmanNO@SPAMapple2.com

-- 
Tom Madden