dick@cimcor.mn.org (Dick Schlotfeldt) (10/12/90)
Can I use a VGA card to drive a Mitsubishi AUM-1371A? If so, how should I wire the cable? This color monitor has a D-sub 25 pin analog input connector described below. It also has a nine pin TTL input and a BNC composite video input. I want to connect a VGA card to the 25 pin analog input: Pin Note Number Signal Number Remarks =============================================================== 1 Sync GND 2 Red video 1 3 Red video GND 1 4 Green video 1 5 Green video GND 1 6 Superimpose control 2 7 Superimpose GND 2 8 Video input select Low or open: BNC input video, High: Pin 9 composite video 9 Composite video in 3 10 Composite video GND 3 11 Composite video out 3 12 Composite video GND 3 13 PGA mode control 4 Low:400 lines, High:480 lines 14 Blue video 1 15 Blue video GND 1 16 Horizontal sync TTL level 17 Vertical sync TTL level 18 TTL color select Low:16 color, high or open: depends on EGA card 19 NC 20 NC 21 INT 5 (+5V) 22 Composite/RGB select 6 Low:RGB, High or open: composite 23 Analog/TTL select 6 Low:TTL, High or open: Analog 24 Remote 6 Low: mode switch is invalid 25 GND (shield) Notes: 1. 0.6 Volts p-p, 75 ohms Positive 2. Low: 0 to 0.4 Volts, High: 1 to 3 volts, 75 ohms. Superimpose control provides high speed switching between composite video and RGB analog. 3. 1.0 Volts p-p, 75 ohms, Sync. negative 4. The manual mentions the IBM PC/AT PGA board as an example source of the analog signal but I know nothing about PGA. I want VGA. 5. What does INT mean? 6. It is clear from the manual that I can leave these open and select analog input from a switch on the back of the monitor. Some specs on this monitor: Horizontal sync 15.6 KHz to 35 MHz (automatically) Vertical sync 45 Hz to 75 Hz (automatically) Video bandwidth: 30 MHz Trio dot pitch: 0.31mm Resolution: 800 dots horizontal, 560 lines vertical. Misconvergence: less than 0.4mm at center. CRT: 13 inch viewable, Diamond Matte coating, Super high contrast glass. For reference, the Orchid Prodesigner VGA/Plus has this pinout: 1 Red 9 Key 2 Green 10 Sync return 3 Blue 11 Monitor ID bit 0 4 Monitor ID bit 2 12 Monitor ID bit 1 5 TTL ground 13 Horizontal sync 6 Red return 14 Vertical sync 7 Green return 15 Not used 8 Blue return Also, do you have any idea what sort of performance I can expect? Will analog VGA provide a better picture than TTL input of EGA? Can it handle 800 x 600 or is 640 x 480 the max? Is it likely to be damaged if I try a resolution higher than it can handle? I am currently using this monitor's RGB TTL input for EGA. Thanks much for any help. Dick Schlotfeldt dick@cimcor.mn.org St. Paul, MN