bill@mwca.UUCP (Bill Sheppard) (07/17/90)
In an attempt to make use of some extra video monitors in the office, as well
as to make some 50Hz software work (and perhaps to be the first post in this
newsgroup) I spent some time making cables to go from my ST to a Sony CPD-1302
Multiscan (Sony's equivalent to NEC's MultiSync) and a Sony PVM-1271Q
monitor. I first tried with the 1302, which has a standard VGA nine-pin input.
I connected Sony pins 1, 2 and 6 to Atari ground, Sony red, green, and blue
to Atari red, green, and blue, and Sony horizontal and vertical sync to Atari
horizontal and vertical sync. No picture. The Sony manual states that "every
polarity is acceptable at pin #8 and #9 (horizontal and vertical syncs). Any
ideas why she won't work? It was suggested to me that Atari's idea of sync
is different from Sony's and that I should make a composite sync by AND'ing
the horizontal and vertical, then attach to Sony's composite sync (which is
also pin #8). Can anyone shed any light on this?
I then made a second cable, going from the nine-pin end of the first cable
to a DB-25 for the Sony PVM-1271Q, a professional video monitor supporting
PAL, SECAM, NTSC, NTSC 4.43, and digital or analog RGB signals. I routed
the signals I mentioned earlier to the appropriate pins, and upon booting
found a picture which rolled vertically (and couldn't be frozen within the
range of the vertical hold control). This at least told me that the first
part of the cable (Atari to nine-pin) was working. When I put in a 50Hz demo,
the screen roll rate changed enough so I could stop the rolling, but the
monitor wouldn't "lock on" to the picture - it would continue to roll to
some degree. I can't find anywhere in the PVM-1271Q documentation that it
is actually a multi-scan monitor, especially since there are separate buttons
to select the various video modes (and a bazillion different inputs on the
back) - would the rolling indicate that this monitor is not capable of
properly displaying ST video?
--
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# Bill Sheppard -- bill@mwca.microware.com -- {uunet,sun}!mcrware!mwca!bill #
# Microware Systems Corporation --- OS-9: Seven generations beyond __/_!! #
#######Opinions expressed are my own, though you'd be wise to adopt them!#######