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