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Graphics Cables

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Graphics Cables

PC Graphics#

3.1) VGA/SVGA (From Sam Goldwasser)

Original VGA (31.5 KHz - 640x480) SVGA (35-37 KHz - 800x600) 15 pin sub D:

6 1 Red (Analog) 6 Red Return 11 (ID0) GND (Color) 11. . . 1 2 Green (Analog) 7 Green Return 12 (ID1) NC (Color) . . . 3 Blue (Analog) 8 Blue Retuen 13 Horzontal Sync . . . 4 Reserved 9 No Connect 14 Vertical Sync . . . 5 Ground 10 Ground 15 No Connect . . . 15 10 5

Note: Monitor ID Lines ID1,ID0=NC,G for color; G,NC for Mono. ID0 only may be used.

Mono VGA is similar using only the Green Video and Return.

3.2) VESA VGA Standard Feature Connector (special 26-pin header)

VESA Standard Feature Connector pin assignment pin assignment === ========== === ========== 1 PB 2 PG 3 PR 4 PI 5 SB 6 SG 7 SR 8 SI 9 Dot Clock 10 Blank 11 HSync 12 VSync 13 GND 14 GND 15 GND 16 GND 17 Ext Video Sel 18 Ext Sync Sel 19 Ext DotClock Sel20 N/C 21 GND 22 GND 23 GND 24 GND 25 N/C 26 N/C

3.3) VGA (VESA standard) (From Bob Myers)

Note that many of the pins shown above as "no connects" (actually, these were sometimes used as monitor ID bits by many manufacturers) are now defined under the VESA Display Data Channel standard. This standard provides two protocols for display ID and control, including support for the full ACCESS.bus interface. The current definition of the "VGA" pinout per the DDC standard is:

6 1 Red (Analog) 6 Red Return 11 Monitor ID0 (opt.) 11. . . 1 2 Green (Analog) 7 Green Return 12 Data (SDA) . . . 3 Blue (Analog) 8 Blue Return 13 Horzontal Sync . . . 4 Reserved 9 +5 VDC (frm host)* 14 Vertical Sync . . . 5 Return 10 Sync return 15 Data clock (SCL)* . . . 15 10 5

Those signals marked with an asterisk would be supplied by the host only if the host supports the DDC2 protocol (I2C or ACCESS.bus).

3.4) VGA

VGA DB15-S Female DB9 Female 15-pin 9-pin assignment 1 1 Red 2 2 Green 3 3 Blue 4 - Monitor ID bit 2 5 - N/C 6 6 GND (red return) 7 7 GND (green return) 8 8 GND (blue return) 9 - N/C 10 - GND 11 - Monitor ID bit 0 12 - Minitor ID bit 1 13 4 Horizontal Sync 14 5 Vertical Sync 15 - N/C

Monitor ID bit 0: reserved Monitor ID bit 1: GND = mono, OPEN = color Monochrome monitors use the green signal

3.5) Somewhat standard 9 pin VGA (From Sam Goldwasser)

For analog VGA/SVGA measured based on my VGA to 9 pin adapter. This is pretty standard as the NEC Multisync II and others use the same pinout:

Pin 1: Red Video Pin 2: Green Video Pin 3: Blue Video Pin 4: H Sync Pin 5: V Sync Pin 6: Red Return Pin 7: Green Return Pin 8: Blue Return Pin 9: Ground

NOTE: IBM PGC assigns pin 4 to Composite Sync and pin 5 is a no-connect.

(From Sam Goldwasser)

BTW, don't use an EGA 9 pin extension cable to connect it to VGA. While this will work, the wires are not shielded or the wrong wires and you will get ghosting and ringing at vertical edges. I constructed mine using proper 75 ohm coax for the RGB and H and V sync as well (though it is not needed for the sync). 3.6) EGA (CPD-1303)

(From Brian Smither)

According to the CPD-1303 user guide:

Pin: 1 2 3 4 5 6 7 8 9 Analog GND GND RED GRN BLU GND --- H/HV V * DIG/NORM GND GND RED GRN BLU GND --- H/HV V /D1 GND GND RED GRN BLU INT --- H/HV V /D2/CGA GND GND RED GRN BLU INT --- H/HV V /D2/MDA GND GND --- --- --- INT GRN H/HV V /D2/EGA GND r R G B g b H/HV V

r-g-b is secondary colors for 64 color EGA

  • Sync on green automatic if H or HV is not assigned to pin #8.

SYNC: any polarity. Vertical size depends on vertical frequency and can be adjusted manually.

3.6.1) DB9 to DB15 cable

(From Brian Smither)

A 9-pin (monitor) to 15-pin (video card) cable can be built as follows:

9-pin F 15-pin M ------- -------- 1,2,6 --------- 5 3 --------- 1 4 --------- 2 5 --------- 3 8 --------- 13 9 --------- 14

This adapter will NOT permit you to run a standard VGA monitor from a MGA/CGA/EGA video card as the signal levels and scan rates are not compatible. It only applies to the CPD1303 and similar monitors.

3.7) EGA - TTL (15.74-21.85 KHz) DB-9 pin:

1 GND 6 Secondary Green Video/Intensity 2 Secondary RED Video 7 Secondary Blue Video 3 Primary RED Video 8 H Sync TTL Positive 4 Primary GREEN Video 9 V Sync TTL Negative 5 Primary BLUE Video

(From Sam Goldwasser)

BTW, don't use an EGA 9 pin extension cable to connect it to VGA. While this will work, the wires are not shielded or the wrong wires and you will get ghosting and ringing at vertical edges. I constructed mine using proper 75 ohm coax for the RGB and H and V sync as well (though it is not needed for the sync).

3.8) CGA - TTL

(15.75 KHz - 320x200 or 640x200) DB-9 pin:

1 GND 6 Intensity 2 Unused 7 Unused 3 RED Video 8 H Sync TTL Positive 4 GREEN Video 9 V Sync TTL Positive 5 BLUE Video

3.9) Monochrome - TTL (18.43 KHz - 720x350) DB-9 pin:

1 GND 6 Intensity 2 Unused 7 Video 3 Unused 8 H Sync TTL Positive 4 Unused 9 V Sync TTL Negative 5 Unused

(From John Bunting)

Pin-outs of that 9 pin monochrome adapter:

pin 1 ground pin 2 ground pin 3 N/C pin 4 N/C pin 5 N/C pin 6 Intensity pin 7 video pin 8 horiz sync pin 9 vert sync

Chapter 4) Macintosh Monitors

4.1) Mac II and Quadra

Mac II Analog (35 KHz H, 66.67 Hz V - 640x480) 15 pin. Mac II and Quadra Analog (49.7 KHz H, 74.55 Hz V - 832x624) 15 pin.

1 Red Ground 8 Blue Video 2 Red Video 9 Sense 2 3 Composite Sync 11 Ground 4 Sense 0 12 Vertical Sync 5 Green Video 13 Blue Ground 6 Green Ground 14 Ground 7 Sense 1 15 Horizontal Sync 8 Reserved (+12)

Chapter 5) Workstation Monitors 5.1) MacIntosh Video

(From Sam Goldwasser)

Mac II - analog (35 KHz H, 66.67 Hz V - 640x480) 15 pin. Mac II and Quadra - analog (49.7 KHz H, 74.55 Hz V - 832x624) 15 pin.

1 Red Ground 8 Blue Video 2 Red Video 9 Sense 2 3 Composite Sync 11 Ground 4 Sense 0 12 Vertical Sync 5 Green Video 13 Blue Ground 6 Green Ground 14 Ground 7 Sense 1 15 Horizontal Sync 8 Reserved (+12)

5.2) Analog Sun 13W3 Color Pinout:

(From: comp.sys.sun.hardware pseudo-FAQ: (2gvhutINNnvd@hatteras.cs.unc.edu)).

Analog: 13W3 connector:

          +----------------- * gnd
          |   +------------- * vertical sync
          |   |   +---------   sense 2
          |   |   |   +-----   sense common (gnd)
          |   |   |   |   +-   composite sync
          |   |   |   |   |
          |   |   |   |   |  grey
    red   |   |   |   |   |  green blue
     |   1o  2o  3o  4o  5o    |     |
    (O)                       (O)   (O)
       6o  7o  8o  9o 10o
       |   |   |   |   |
       |   |   |   |   +---   composite common (gnd)
       |   |   |   +-------   sense 0
       |   |   +-----------   sense 1
       |   +--------------- * gnd
       +------------------- * horizontal sync

* May be NC. My spies tell me Sun considers these obsolete.

'green' is used by greyscale monitors for video input.

Sense table - 1=nc, 0=strap to gnd

Sense  Type
=====  ========
    0  TBD (?))
    1  Reserved
    2  1280x1024, 76Hz
    3  1152x900, 66Hz
    4  1152x900, 76Hz, 19"
    5  Reserved
    6  1152x900, 76Hz, 16 or 17"
    7  Nothing (no monitor connected)


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