On 15/11/06, jzmuda2000 <
hwhacker@...> wrote:
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> Given the vintage of this thing, you will be looking for 1488 and
> 1489 (TTL <-> RS232 level convertor chips) chips. Try putting a
> scope on the TTL data lines that are coming from the PC. See if you
> are getting anything on the other side of the RS232 receiver chip.
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> Did you ever find a manual on this thing? So you know how to set
> the baud rate switches?
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> Jim
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I'l change the chip, it does have a 1488 but no 1489, some transistors.
It has pin 20 connected to them so its using at least one handshake.
Baud rate etc is on dip switches and the settings are printed on the
back for 300 upto 9600
Lez