[Coco] Test RS232 pak

[Bill]

No matter what I poke, I still get no activity from the Pak. I have one I
bought a week or so ago that does the same thing, so I feel that there is a
possibility that it is the Coco3 problem, since that is what I'm trying it
on. I'll try it on a Coco2 tomorrow. Thanks.

> -----Original Message-----
> From: coco-bounces at maltedmedia.com [mailto:coco-
> bounces at maltedmedia.com] On Behalf Of Darren A
> Sent: Tuesday, March 31, 2009 7:26 PM
> To: CoCoList for Color Computer Enthusiasts
> Subject: Re: [Coco] Test RS232 pak
> 
> Even pressing the 'Z' key does not change the menu option?  That's
> quite strange since it has nothing to do with the functioning of ACIA
> chip. It almost sounds like the ROM is defective, which would be very
> unusual.
> 
> Make sure the edge connector contacts are clean and maybe re-seat the
> socketed chips. Also try entering POKE 65315,52  before doing the EXEC
> 49152 and see if it makes any difference.
> 
> If you have a meter you can test for voltage levels on the DB25
> connector.  The simplest test is to probe GND (pin 7) and DTR (pin
> 20).  This should show a negative voltage at power on / reset.
> Entering POKE 65386,1 should change it to a positive voltage and POKE
> 65386,0 return it to negative again.
> 
> If you're doing this with a CoCo 3 you may have the power supply issue
> with the serial pak that others here have mentioned before.
>