Macintosh Video to VGA adapter pinout

15 pin highdensity D-SUB female connector layout
15 pin highdensity D-SUB female connector at the monitor cable


15 pin D-SUB male connector layout
15 pin D-SUB male connector

Use this adapter to connect a standard VGA (or higher) monitor to your Apple Macintosh.

* Connection
as shown wil allow multiple resolutions up to 1152×870. Reverse diode to
limit resolutions to 1024×768. The Mac Centris, Quadra, and later
systems frame buffer determines what type of display is attached to the
video connector by examining the state of 3 sense line pins.

The Mac
Quadras, Centris series, and later models should support any display,
whether from Apple or from another vendor, that meets one of the
following specifications:

STANDARD SENSE CODES (1 or more of the sense pins grounded):


Display Sense Pins Horiz & Vert Band
Width
Vert
Refrsh
Horiz
Refrsh
  10 7 4 Pixels (MHz) (Hz) (KHz)
Apple 21″ Color 0 0 0 1152 x 870 100 75 68.7
Apple Portrait 0 0 1 640 x 870 57.2832 75 68.9
12″ AppleColor RGB 0 1 0 512 x 384 15.6672 60.15 24.48
Apple 2-page Mono. 0 1 1 1152 x 870 100 75 68.7
NTSC (To produce a color NTSC signal, an RGB-to-NTSC converter is required.) 1 0 0 underscan-512 x 384 12.2727 59.94 15.7
1 0 0 overscan-640 x 480 12.2727 59.94 15.7
13″ Apple Hi-Res Mono 1 1 0 640 x 480 30.24 66.7 35.0
13″ AppleColor
Hi-Res RGB
1 1 0 640 x 480 30.24 66.7 35.0
Apple 16″ Color Disp.   832 x 624 57.63 75 75
Portrait Color,
such as Radius
1 0 1 640 x 870 57.2832 75 68.9
EXTENDED SENSE CODES (enabled by not grounding any sense pins)
  Sense Pins  
4-10 10-7 7-4
16″ color, such as
E-Machines
0 1 1 832 x 624 57.2832 75 49,7
PAL:
PAL has two wiring options, using the extended sense pin configuration.
To produce a color PAL signal, an RGB-to-PAL converter is required.
PAL option 1 0 0 0 underscan- 640 x 480 14.75 50 15.625
overscan- 768 x 576 14.75 50 15.625
PAL option 2 1 1* 0 underscan-640 x 480 14.75 50 15.625
overscan- 768 x 576 14.75 50 15.625
(*Note: This PAL option also requires a diode between pins 10 and 7, with the cathode on 10)
VGA 1 0 1 640 x 480 25.175 59.95 31.47
Super VGA 1 0 1 800 x 600 36 56 35.16
(To enable Super VGA after
configuring the sense pins and connecting the monitor for VGA, open the
Monitors control panel and select Options. Choose Super VGA from the
list and restart your system.)
19″ color 1 1 0 1024 x 768 80 75 60.24
No external monitor
(video halted)
1 1 1

Notes:

1) Sense pins 4, 7, and 10 are
referred to as MON.ID1, MON.ID2, and MON.ID3 in the Macintosh pinout
table or SENSE0, SENSE1, and SENSE2 in pinout tables for the video
connectors. A sense pin value of 0 means that pin should be grounded to
the C&VSYNC.GND signal (pin 11); a value of 1 means do not connect
the pin.

2) Extended sense codes will be examined if the following sense code is detected: 1 1 1 (no sense pins grounded).

 

NOTE
for extended sense codes: Sense pin pair value of 0 means those pins
should be tied together (as opposed to grounding 10, 7, or 4 to pin 11);
value of 1 means leave open. DON”T wire any of these pins to ground.

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