30 Aug
2007
30 Aug
'07
4:21 p.m.
All,
I've been digging through my pile of stuff again and figured that my
old HP98789A 17" (Sony) monitor might be a good match my my beige Mac
G3.
Okay, my next step is to wire up an adapter. The HP is RGB (3 BNC)
to sync-on-green. I read that the Power Macs don't support SOG, so I
need to combine both the HSYNC and VSYNC with green (a couple of
74HCxx gates should do that; I can steal power from the sync
signals). Otherwise, it's connect pin 4 to 7 (S0 to S1) on the Mac
video connector to signal that I want "RGB 1024x768".
Do I have this right? Does anyone have anything to add before I take
out my soldering iron?
Cheers,
Chuck
30 Aug
30 Aug
5:08 p.m.
--- Chuck Guzis <cclist at sydex.com> wrote:
All,
I've been digging through my pile of stuff again and
figured that my
old HP98789A 17" (Sony) monitor might be a good
match my my beige Mac
G3.
Okay, my next step is to wire up an adapter. The HP
is RGB (3 BNC)
to sync-on-green. I read that the Power Macs don't
support SOG, so I
need to combine both the HSYNC and VSYNC with green
(a couple of
74HCxx gates should do that; I can steal power from
the sync
signals). Otherwise, it's connect pin 4 to 7 (S0 to
S1) on the Mac
video connector to signal that I want "RGB
1024x768".
There were dookickies that took care of the mode
setting. Some had dials, others dips. I used to have a
bunch, may have come across 1 in recent history. But
mine were a bridge between duh Mac and a VGA-BNC
cable. The info on how to *dial up* a specific video
mode (by shorting 2 pins) should be readily available
on duh net I would think. Macs (older ones anyway) had
to select a video mode at boot, or no video signal
would output.
I'm surprised to hear that *PMs* don't output SOG.
Depends what you mean by PM. I thought the earlier
models did, but what do I know.
I used to *cheat*. I would feed separate syncs onto
the green line w/a resistor. Those monitors, of which
there were 2 versions (~48khz and ~64khz) would take
the sync on R,G, or B IIRC. Don't quote me though. It
could be that I was using a video card (aftermarket)
that delivered syncs on all 3. Don't really remember.
There's a vintage mac usenet group if you weren't aware.
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7:05 p.m.
On 30 Aug 2007 at 17:08, Chris M wrote:
There were dookickies that took care of the mode
setting. Some had dials, others dips. I used to have a
bunch, may have come across 1 in recent history. But
mine were a bridge between duh Mac and a VGA-BNC
cable. The info on how to *dial up* a specific video
mode (by shorting 2 pins) should be readily available
on duh net I would think. Macs (older ones anyway) had
to select a video mode at boot, or no video signal
would output.
I'm surprised to hear that *PMs* don't output
SOG.
Depends what you mean by PM. I thought the earlier
models did, but what do I know.
Starting with the 9600, apparently, so the older series PM's
apparently still generate SOG:
http://developer.apple.com/documentation/Hardware/Developer_Notes/Maci
ntosh_CPUs-PPC_Desktop/PPC_7300_7600_8600_9600.pdf
CSYNC (Pin 3 on the Mac video connector) is still available, however.
I went for a "quick and dirty" and just tied that to Green with a 470
ohm resistor. It'll do for now. Nice crisp display.
I forgot how darned heavy those old HP monitors were. I hope the
plastic case top will support it. :)
Cheers,
Chuck
11 Sep
11 Sep
9 a.m.
On Friday 31 August 2007 03:05:24 Chuck Guzis wrote:
I forgot how darned heavy those old HP monitors were.
I hope the
plastic case top will support it. :)
I forgot how darned heavy those old HP monitors were. I hope the plastic case
top will R%$^S3{""fd{34f{
NO CARRIER
;-)
Gordon
6273
days inactive
6285
days old
3 comments
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