The Macintosh LC supports 3 different timing modes:<br>
 <br>
- Macintosh 12-inch RGB Display's 512x384<br>

- Macintosh 12-inch RGB Display's 560x384 (generated by Apple IIe card,<br>
  4-bit only)<br>
- Macintosh 12-inch Monochrome Display, Macintosh High-Resolution<br>
  Monochrome, Macintosh High-Resolution RGB (640x480)<br>
 <br>
In 640x480 mode, Macintosh LC uses the CPU clock (31.3344 MHz) as the<br>
pixel clock. This is opposed to the 30.24 MHz clock that is normally<br>
specified. This results in 32 extra pixels per scan line.  The 640 active<br>

pixels are centered in the active video field with 16 black pixels placed<br>
on either side. Horizontal and vertical scan rates remain the same.  A<br>
visual distortion from square pixels will occur, making the pixels 3% too<br>
narrow.  The Macintosh 12-inch Monochrome display will be able to correct<br>
for this distortion, but the current monochrome and RGB monitors will not.<br>
 <br>
The 560x384x4 Apple IIe mode is selectable only when an Apple IIe card is<br>
present. The card is necessary because the 17.234 MHz oscillator required<br>
for this video mode is located on the Apple IIe card itself.<br>