Pin__SGI_______SGI (DDC)________SUN SPARC_____SUN (older)_____VGA_______________Apple

A1___Red_________Red_______________Red____________Red_____________________________Blue

A2___Green_______Green______________Green_________Green____________________________Green

A3___Blue________Blue_______________Blue___________Blue_____________________________Red

01___Mon 3_______Data clk. (SCL)______Serial Read_____N/C_________Red_________________H. Sync Ground

02___Mon 0_______Bidirect.data(SDA)___V. sync________N/C_________Green________________V. Sync Ground

03___C.Sync______Gnd_______________Sense0________Sense2______Blue_________________Sense 3

04___H.sync______H.sync_____________Gnd___________Gnd_________N/C or ID bit 2_________Sense Ground

05___V. sync______V.sync_____________C. sync________C.sync______Gnd__________________C. Sync

06___Mon 1_______DDC 5v+ input_______H. sync._______N/C_________(Red) Gnd_____________H. Sync Ground

07___Mon 2_______DDC Gnd___________Serial write_____N/C_________(Grn) Gnd_____________V. Sync Ground

08___Dig. Gnd_____Gnd_______________Sense1________Sense 1______(Blu) Gnd_____________Sense 2

09___Dig. Gnd_____Gnd_______________Sense2________Sense 0______NO PIN (key)__________Sense 1

10___Dig. Gnd_____Gnd_______________Gnd___________Gnd_________(Sync) Gnd____________C. Sync Ground

11_____________________________________________________________N/C or ID Bit 0

12_____________________________________________________________DDC Data (SDA) or ID Bit 1

13_____________________________________________________________H. sync or C. sync

14_____________________________________________________________V. sync

15_____________________________________________________________DDC Clock (SCL) or ID Bit 3

That's it for now, gotta double-check the Apple 13W3 Pinout.