TITLE
    Macintosh IIci Video: Supported Resolutions and Scan Rates
Article ID:
Author:
Created:
Modified: 		5336

4/3/90
7/9/92
TOPIC



    I want to use a Zenith VGA monitor with the Macintosh IIci. The
    horizontal scan rate for the monitor is 31.49, and the hertz rate is
    60-70. Can I adjust the scan rate on the Macintosh IIci, so that it will
    work with this monitor?

DISCUSSION

    The Macintosh IIci RBV (RAM-Based Video) supports the following
    resolutions and scan rates:

    ID1 ID2 ID3 Monitor type Format Vert. Horiz.
    --- --- --- ------------ ------ ------- ------
    0 0 0 Unsupported monitor (video halted)
    0 0 1 Unsupported monitor (video halted)
    0 1 0 Reserved for future use
    0 1 1 Apple High-Resolution Monochrome 640x480 66.7Hz 35KHz
    0 1 1 AppleColor High-Resolution RGB 640x480 66.7Hz 35KHz
    1 0 0 15-Inch Portrait Display 640x870 75Hz 68.86KHz
    1 0 1 Reserved for future use
    1 1 0 Unsupported monitor (video halted)
    1 1 1 No external monitor (video halted)

    1=no connection; 0=grounded

    For an analog RGB monitor to work on the Macintosh IIci, it needs to meet
    one of the above specifications.

    Here are the pinouts for the Macintosh IIci RBV connector:

    01 RED.GND Red Video Ground
    02 RED.VID Red Video
    03 CSYNC Composite Sync.
    04 MON.ID1 Monitor ID, Bit 1
    05 GRN.VID Green Video
    06 GRN.GND Green Video Ground
    07 MON.ID2 Monitor ID, Bit 2
    08 nc (No Connection)
    09 BLU.VID Blue Video
    10 MON.ID3 Monitor ID, Bit 3
    11 C&VSYNC.GND CSYNC & VSYNC Ground
    12 VSYNC Vertical Sync.
    13 BLU.GND Blue Ground
    14 HSYNC.GND HSYNC Ground
    15 HSYNC Horizontal Sync.
    Shell CHASSIS.GND Chassis Ground


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