NEC XM37 User Manual page 33

Composite Sync. & Video (Sync. on Green)
HORIZONTAL
VERTICAL
Recommended Sync Signal Timing
Horizontal sync duty should be 3 to 30%.
Horizontal sync width should exceed 0.9 sec.
Horizontal back porch should exceed 2.0 sec at sync on green and 1.2 sec at others except when at 15KHz.
Horizontal blanking should exceed: 7.0 se at fH 15.75kHz, 3.3 sec at 30 kHz<fH<50kHz, 2.9 usec at 51kHz<fH<80kHz,
and 2.7 sec at 81kHz<fH<95kHz
Vertical sync duty should be 0.2 to 10%.
Vertical sync width should exceed 40 sec or 2 horizontal lines.
Vertical sync width plus back porch should exceed 0.4 msec.
Interlaced signals are not recommended.
Interlaced signals with composite sync may not be displayed.
VIDEO
B D
C
A
P Q
P
E
VIDEO
S
R
O
Sync. Polarity: Negative
55
56
15