Re: Monitor for A410/1 and RISC OS 2 *** SOLVED

In article <ant141649b49pErr@xxxxxxxxxxxxxxxxxxxxxx>, Chris Evans
<URL:mailto:chris@xxxxxxxxxxxxxxx> wrote:
In article <ksv*6NP9r@xxxxxxxxxxxxxxxxxxxxxxxxxxx>, Theo Markettos
<URL:mailto:theom+news@xxxxxxxxxxxxxxxxxxxxxx> wrote:
Chris Evans <chris@xxxxxxxxxxxxxxx> wrote:
Thanks Theo for all the info, I will see what the customer is willing to
try. Though I can't see anything here that explains why the monitor &
adaptor worked fine here on our A420 with RISC OS 3 but not on the
customers A410 RISC OS 2 unit.

Does your A420 have a VIDC enhancer?

Ours doesn't and the customer doesn't think his does, if he did MODE 0 still
should work anyway I'd have thought. The picture isn't stable even before
the hard disc is accessed i.e. it can't be his module setting a non
compatible mode.

They sometimes provide facilities to
control the syncs and provide settable sync polarity.

Otherwise it might either be because the jumpers are set differently on the
customer's machine, or one or other of them has had some board mods (eg the
cutting pin 3 of IC9 that I mentioned). If you could find out what sort of
sync the Taxans were expecting it might help (can't find a manual on the
web).

I can't remember any monitor requiring internal link changes.
I think I have a 770 or 775 somewhere here, I will check it.

Fix do not have LK2 made

After fitting RISC OS 2 to our 410 we still didn't get the problem, however
we found that if LK2 was made (It connects V Sync to pin 5 of the 9pin
monitor socket) we got the same as the customer i.e. scrolling with an AKF52
but o.k. on a 770

Low and behold the customer did have LK2 made. All the 440 & 4x0/1 we have
here did not have it made. The customer says it came from Watford
Electronics like that!


Chris Evans

--
CJE Micro's / 4D 'RISC OS Specialists'
Telephone: 01903 523222 Fax: 01903 523679
chris@xxxxxxxxxxxxxxx http://www.cjemicros.co.uk/
78 Brighton Road, Worthing, West Sussex, BN11 2EN
The most beautiful thing anyone can wear, is a smile!

.

Relevant Pages

  • Re: Monitor for A410/1 and RISC OS 2
    ... customers A410 RISC OS 2 unit. ... compatible mode. ... control the syncs and provide settable sync polarity. ... I can't remember any monitor requiring internal link changes. ...
    (comp.sys.acorn.hardware)
  • Monitor for A410/1 and RISC OS 2
    ... We have a customer who needs to replace his Taxan 870 monitor. ... worked fine here on a RISC OS 3 A420/1 ...
    (comp.sys.acorn.hardware)
  • Re: LCD Monitor Problem
    ... with the sync and monitor type in the command line) works absolutely ... fine with the RISC OS desktop. ... undetected sync. ... like, epecially for an LCD, sorry. ...
    (comp.sys.acorn.hardware)
  • Re: Monitor for A410/1 and RISC OS 2
    ... Chris Evans wrote: ... Though I can't see anything here that explains why the monitor & ... customers A410 RISC OS 2 unit. ... control the syncs and provide settable sync polarity. ...
    (comp.sys.acorn.hardware)
  • Re: LCD Monitor Problem
    ... with the sync and monitor type in the command line) works absolutely ... fine with the RISC OS desktop. ... undetected sync. ... The trick to get them to work with CRT monitors was to define the ...
    (comp.sys.acorn.hardware)