Sync

Figure 4-3 Sync Circuitry (Part of Game PCB 030845-XX A)

b. sync circuitry

6 MHz and horizontal synchronization signals are the direct output of counters L5. M5 and N6. These signals are the result of counting the pulses from crystal Yl. Fur ther shaping of horizontal sync through flip-flop K5 develops HSYNC.

Vertical synchronization signals are the direct output of counters F5 and H5 These signals are the result of counting HSYNC pulses. Vertical synchronization components are developed by sync PROM H4 and clocked through latch F4 by HSYNC.

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