SHAOSI connected 1.5 kOhm resistor to GP0, 680 Ohm to GP1, 330 Ohm to GP2 and 1K to GP4 (sync) - all of them connected together create analog VIDEO. Program for PIC12C508A is PIC12-T1.ASM (429 words or 643.5 bytes). Result:
UPDATE: After pulling-up GP4 with 2K resistor it's a little bit more stable:
Test setup:
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