Re: Q: ADT-transfers on Franklin ACE 2200 + Super Serial Card II

["John B. Matthews" <nospam@nospam.invalid>]

In article <GrOdnXcPh5yhzV3VnZ2dnUVZ_sninZ2d@comcast.com>,
 "Bill Garber" <willy46pa@comcast.net> wrote:

> "John B. Matthews" <nospam@nospam.invalid> wrote in message 
> nospam-2B1796.16482304092008@news.motzarella.org">news:nospam-2B1796.16482304092008@news.motzarella.org...
> > In article <qNmdnRynH7UpiF3VnZ2dnUVZ_rfinZ2d@comcast.com>,
> > "Bill Garber" <willy46pa@comcast.net> wrote:
> > 
> >> "John B. Matthews" <nospam@nospam.invalid> wrote in message 
> >> nospam-1428E0.12460204092008@news.motzarella.org">news:nospam-1428E0.12460204092008@news.motzarella.org...
> >> > In article <H-6dnf-dHrQinl3VnZ2dnUVZ_h-dnZ2d@comcast.com>,
> >> > "Bill Garber" <willy46pa@comcast.net> wrote:
> >> >>
> >> >> "DeaconBlue" <locksmith64@doramail.com> wrote in 
> >> >> message qr2dncQPsYS-ZyLVnZ2dnUVZ8judnZ2d@giganews.com">news:qr2dncQPsYS-ZyLVnZ2dnUVZ8judnZ2d@giganews.com...
> >> >> > Hello again!
> >> >> > 
> >> >> > I tried with the SSC-block pointing down and 
> >> >> > straight-through without the null-modem adapter. 
> >> >> > This produced the same "[00]" in the terminal-program, 
> >> >> > but no response when trying ADT.  With the null-modem 
> >> >> > adapter no characters are transferred to terminal as 
> >> >> > expected.
> >> >> > 
> >> >> > I have also tried random selection of different JP7/JP8 
> >> >> > settings, but with no result.
> >> > 
> >> >> For anyone else interested in how to use an SSC, 
> >> >> here is a link to the FAQs on the subject.  ;-) 
> >> >> 
> >> >> http://home.swbell.net/rubywand/Csa2T1TCOM.html#013 
> >> > 
> >> > Here's some additional programming information, too:
> >> > 
> >> > <http://home.woh.rr.com/jbmatthews/ssc.html>
> >>
> >> And, it contains the link above that I have posted. 
> > 
> > Thank you for providing the link I slipped in just before posting! :-) 
> 
> I'm not finished yet. I'm making a mirror of the FAQs 
> to put on my site. 
> 
> > I've tracked down bad cables and connectors using a VOM. 
> > Is there a way for the OP to see if the card itself is 
> > functional, say by storing $10 in $C08A+slot and checking 
> > RTS (pin 4)?
> 
> What does the FAQ tell us? 

Alas, it mentions using an Ohm meter to detect open- and short-circuits 
in many contexts, but there's nothing on measuring TTL levels under 
program control to diagnose an SSC. I'm sure a VOM responds too slowly 
to see changes on TXD, but maybe you could measure a constant level. 
Clearing bits 2-3 of $C08A+slot should make RTS high. I'm guessing.

-- 
John B. Matthews
trashgod at gmail dot com
home dot woh dot rr dot com slash jbmatthews