Macintosh LC III: Using with a VGA Monitor

This article describes how to connect a VGA monitor to a Macintosh LC III.
This article has been archived and is no longer updated by Apple.
To connect a VGA monitor to the Macintosh LC III video port, a cable with the following configuration is required.

Macintosh LC III
DB-15                                         VGA Connector
-------------                                 --------------

 2  ------------------- Red Video ------------  1
 1  ------------------- Red Ground -----------  6
 9  ------------------- Blue Video -----------  3
13  ------------------- Blue Ground ----------  8
 5  ------------------- Green Video ----------  2
 6  ------------------- Green Ground ---------  7
15  ------------------- Hsync ---------------- 13
12  ------------------- Vsync ---------------- 14
14  ------------------- Sync Ground ---------- 10
10  ---------------- |
 7  ---------------- |Connect 7 & 10 so the sense pin ID will equal VGA

A few issues to remember when connecting VGA monitors to the Macintosh LC III:

* VGA monitors may have variances when purchased from different VGA monitor vendors. Test a particular monitor for compatibility with the Macintosh LC III before buying.

* VGA monitors from different vendors have different image quality specifications. There may be significant differences between Apple-brand monitors and VGA monitors. Look at the monitors side-by-side before buying.

* When a VGA monitor is connected as described above, the resolution is 640 x 480.

* The bit depth supported depends on the amount of VRAM installed. The Macintosh LC III ships with 512K of VRAM in one VRAM SIMM socket and is expandable to 768K.
Published Date: Feb 19, 2012