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