🚀 go-pugleaf

> Craig Dewick writes:> 
> 
> I've recently been given a bunch of Apollo Domain 3000 machines with 19" 
> colour monitors. All of the monitors work, and I expect that their specs
> are capable of handling Sun video signals, except that there is one snag. 
> 
> These monitors only have three inputs, so I am presuming that the sync
> signal that is supplied as a seperate output on Sun framebuffers needs to
> be combined with one of the colour gun drive signals, presumably the green
> signal. The question is though - how do I do this? 

I have absolutely no idea if the following works, but it may be
useful:

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from comp.sys.next.hardware:13744:

job (jdbogan@woodlawn.uchicago.edu) wrote:
: Does anybody know how to take the normal db15 (vga) signals, and put the
: syncs on green?  I have a NeXT monitor that i'd like to run w/ a pc, and
: from what i understand, the monitor requires sync on green.

: If there is a company that makes such a device, that'd be great.  but if
: anybody knows how to make the circuit, that'd work too. (a 4 bnc => 3 bnc
: w/ sync on green would also work.)
: thanks
: job
: --
: jdbogan@midway.uchicago.edu

I use the following without any poblems
on a DEC 1280x1024 monitor with my Diamond
stealth V64 and BSD/XFree and Windose. But dont
blame me if you blow something up !!
 


                        +5.0V
                        |
                        /
                        \ VR1 (~500)
        33uF tantalum   |   ~0.3V DC
 GREEN------|----||-----|--------------------|-----GREEN to workstation
            |----||-----|                    |
        .1-.01uF ceramic                     |
                                             |
                                            _|
 HSYNC--------|-------\                     |
              | GATE   |------CSYNC---------||    VN10KM or similar small
 VSYNC--------|-------/                     |_   N channel enhancement MOSFET
              |                               |
                                               Gnd
 HSYNC, VSYNC and CSYNC are ground with 4.7k carbon resisitors
 GATE=
 OR: for +ve logic sync and no hsyn during vsync
 XOR: for -ve or +ve logic sync and hysnc during vsync
 NAND: for -ve sync and no hsync during vsync
 Capacitors are optional, I dont use them and I use XOR

-------snarfed article ends------------

have fun

duncan
-- 
  Duncan McRae                               _T_e_l_e_c_t_r_o_n_i_c_s__|/\  __
  Telectronics Pacing Systems - Sydney R&D             Pacing Systems     \/
  7 Sirius Rd, Lane Cove, NSW 2066, Australia
  +61 2 413 [ Tel:6965 | Fax:6060 ]   duncanm@tplrd.tpl.oz.au | duncanm@tps.com