Subject: Re: Help please: Connect VGA monitor to From: David Bolt Date: Tue, 21 Oct 1997 01:11:34 GMTOn 28 Sep 1997 18:56:23, Dave Robinson wrote: > I have a 1985 Atari ST with a monitor connection only. It has been > quite severley adjusted and now has 4MB and I use it mainly for midi > and haven't moved over to the PC as the PC version of Cubase is > getting some severe criticism for timing problems and crashes. My > SM124 has recently died and I have an old VGA (15 pin) PC monitor that > I would like to connect. Is this possible and if so does anyone know > the pinout to use?? After a lot of digging around in magazine back-issues, I've found the following that should help. Here are the connection details for an ST(E) to VGA monitor: ST to VGA (Colour) ------------------ ST pin number VGA pin number 7 ( Red ) ------------ 1 ( Red ) 6 ( Green ) ---------- 2 ( Green ) 10 ( Blue ) ----------- 3 ( Blue ) 9 ( H Sync ) --------- 13 ( H Sync ) 12 ( V Sync ) --------- 14 ( V Sync ) 13 ( GND ) ------------ 10 ( GND ) The following pins also need connecting together on the VGA connector: 4 ( Monitor ID Bit 2 ? ) 6 ( Red GND ) 7 ( Green GND ) 8 ( Blue GND ) 10 ( GND ) 11 ( GND ) Note. To work in this mode, the monitor must be able to operate at a line frequency of 15.5 KHz. ST to VGA (ST High) ------------------- ST pin number VGA pin number 9 ( H Sync ) --------- 13 ( H Sync ) 12 ( V Sync ) --------- 14 ( V Sync ) 13 ( GND ) ------------ 10 ( GND ) 10 ( Mono Out ) needs connecting to 4K7 resistor, and then to VGApins 1, 2 and 3. The following pins also need connecting together on the VGA connector: 4 ( Monitor ID Bit 2 ? ) 6 ( Red GND ) 7 ( Green GND ) 8 ( Blue GND ) 10 ( GND ) 11 ( GND ) The following pins also need connecting together on the ST connector: 4 ( Mono Detect ) 13 ( GND ) Regards, David E-Mail :- dbolt@my-ste.demon.co.uk /**********************************************************\ * * * Proud owner of: Atari 520STE 4Mb + Syquest EZ-135 + V.34 * * * \**********************************************************/