Some ALDL questions

[Stephen Thurber]

Appears to me that this circuit may have the polarity reversed on each 
of the capacitors connected to pins 2 and 6 of the MAX232.
=======================
On Sun, 6 Apr 1997, Mark Glicksman wrote:

> Hello eyeryone,
> 
> 	Well, I have been reading over the archives on ALDL data, and I have a
> couple of questions that some of you guys may be able to help me with (I
> hope ;) ).
> 
> 1) I have been looking at the following diagram........
> 
> >               +-------------+  +
> >   +-----------|1          16|---+---o +5V (VCC)
> >  +|          +|             |  ===
> >  === +5V o-||-|2  MAX232  15|---+---o GND (card & RS-232)
> >   |           |             |
> >   +-----------|3          14|
> >            +  |             |        o +5V
> >      +---||---|4          13|        |
> >      |        |             |        \
> >      +--------|5          12|        / 10K
> >           +   |             |        \
> >      GND o-||-|6          11|        /
> >               |             |        |
> >      RxD o----|7  ---<--- 10|--/\/\/-+----------+----o ALDL I/O
> >               |             |  10K         |\   |
> >      TxD o----|8  --->---  9|--------------| |--+
> >               +-------------+             1|/ 2
> >                                           74LS07
> >
> >        (also connect to 74LS07, pin 7=GND, pin 14=VCC)
> 
> I believe this diagram was submitted by George M. Daily.
> 
> I noticed that  by pins 2, 4, 6, and between pins 15 & 16, there are
> capacitors shown, however, there are no values associated with these
> capacitors, does anyone know what the values of them are?
> 
> 2) Has anyone actually built this circuit/cable and tried it???
> 
> 3) Does it work with the 160baud CCC and the 8192baud P4 computers?
> 
> 4) What does the data output look like after it comes through?
> 
> I am trying to build this so that I may diagnose my 1987 Buick Park
> Avenue. (Picked it up for $550.00)  Unfortunately I don't have enough
> money to afford the Diacom package.
> 
> Any help with this would be greatly appreciated.
> 
> 			Very truly yours,
> 			Mark Glicksman
> 			mglicksm at suffolk.lib.ny.us
>