diff --git a/src/main.c b/src/main.c
index 7168f30..fbb0230 100644
--- a/src/main.c
+++ b/src/main.c
@@ -85,28 +85,18 @@ static void vga_vsync_program_init(PIO pio, uint sm, uint offset)
 
 int main()
 {
-	// main clock = VCO / divider1 / divider2 = 126MHz
-	pll_init(pll_sys, 1, 1500 * MHZ, 6, 2);
-
 	stdio_init_all();
+	sleep_ms(5000);
 
 	// "draw" an horizontal dotted line (?)
 	for (unsigned int c = 0; c < 5; c++)
 	{
 		frames[0].data[80 * 64 + 30 + c] = 0x55;
 	}
-	/*
-	for (unsigned int c = 0; c < 20; c++)
-	{
-	    frames[0].data[80 * 128 + 30 + c] = 0x99;
-	}
-	*/
 
 	// PIO and state machines
 	PIO pio = pio0;
 
-	sleep_ms(5000);
-
 	// VGA HSYNC program
 	uint offset1 = pio_add_program(pio, &vga_hsync_program);
 	uint sm1 = pio_claim_unused_sm(pio, true);
@@ -114,8 +104,8 @@ int main()
 	vga_hsync_program_init(pio, sm1, offset1);
 	printf("Feeding horizontal sync...\n");
 	// low pulse is X pixels long, and SM runs at 4x of pixel clock
-	pio_sm_put_blocking(pio, sm1, 64 * 4);
-	pio_sm_put_blocking(pio, sm1, 765 * 4);
+	pio_sm_put_blocking(pio, sm1, (64 - 1) * 4);
+	pio_sm_put_blocking(pio, sm1, (776 - 1) * 4);
 
 	// VGA VSYNC program
 	uint offset2 = pio_add_program(pio, &vga_vsync_program);