diff -Naru old/isp.c new/isp.c
--- old/isp.c	2009-05-17 15:14:30.000000000 +0900
+++ new/isp.c	2009-05-17 15:25:35.000000000 +0900
@@ -105,6 +105,11 @@
 
 void ispConnect() {
 
+	/* added by Yuki */
+	ISP_OUT |= (1 << ISP_MISO);		// MISO pull up
+	DDRC |= (1 << 5);				// PC5 OE
+	PORTC &= ~(1 << 5);				// OE=L
+
 	/* all ISP pins are inputs before */
 	/* now set output pins */
 	ISP_DDR |= (1 << ISP_RST) | (1 << ISP_SCK) | (1 << ISP_MOSI);
@@ -131,6 +136,9 @@
 	/* switch pullups off */
 	ISP_OUT &= ~((1 << ISP_RST) | (1 << ISP_SCK) | (1 << ISP_MOSI));
 
+	/* added by Yuki */
+	DDRC &= ~(1 << 5);	// PC5 OE off
+
 	/* disable hardware SPI */
 	spiHWdisable();
 }
@@ -191,10 +199,11 @@
 		spiHWdisable();
 
 		/* pulse SCK */
+		ispDelay();			/* moved by Yuki */
 		ISP_OUT |= (1 << ISP_SCK); /* SCK high */
 		ispDelay();
 		ISP_OUT &= ~(1 << ISP_SCK); /* SCK low */
-		ispDelay();
+		/* ispDelay(); */	/* moved by Yuki */
 
 		if (ispTransmit == ispTransmit_hw) {
 			spiHWenable();
diff -Naru old/main.c new/main.c
--- old/main.c	2009-05-17 15:14:41.000000000 +0900
+++ new/main.c	2009-05-17 15:25:35.000000000 +0900
@@ -42,10 +42,26 @@
 	if (data[1] == USBASP_FUNC_CONNECT) {
 
 		/* set SCK speed */
-		if ((PINC & (1 << PC2)) == 0) {
-			ispSetSCKOption(USBASP_ISP_SCK_8);
+		DDRC &= ~(1<<3);
+		PORTC |= (1<<3);
+		asm volatile("nop\n"::);
+		asm volatile("nop\n"::);
+		if (!(PINC & (1<<3))){
+			/* PC3 = L */
+			ispSetSCKOption(USBASP_ISP_SCK_187_5);	/* 187.5kHz */
 		} else {
-			ispSetSCKOption(prog_sck);
+			DDRC |= (1<<2);
+			PORTC &= ~(1<<2);
+			asm volatile("nop\n"::);
+			asm volatile("nop\n"::);
+			if (!(PINC & (1<<3))){
+				/* PC2 = PC3 */
+				ispSetSCKOption(USBASP_ISP_SCK_93_75);	/* 93.75kHz */
+			} else {
+				ispSetSCKOption(prog_sck);	/* auto */
+			}
+			DDRC &= ~(1<<2);
+			PORTC |= (1<<2);
 		}
 
 		/* set compatibility mode of address delivering */