Apple LC520 Specifications Page 40

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CHAPTER 2
Architecture
28 Video Display Timing
Figure 2-4 Video timing for the Apple IIe card
Video
144 dots 560 dots
704 dots
Back porch = 80 dots
Horizontal sync pulse = 32 dots
Front porch = 32 dots
HBLANK
/HSYNC
Video
Horizontal timing
Video
23 lines 384 lines
407 lines
Back porch = 19 lines
Vertical sync = 3 lines
Front porch = 1 line
VBLANK
/VSYNC
Lines of Video
Vertical timing
Black
White
Black
White
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