Changes for page Front I/O

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6	6
7	7	There is a single cable that controls four parts, each half side of I/O LED and center column of blue LEDs.
8	8
9		-== Sub-paragraph ==
	9	+== ==
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21		-
22	22	= How we got here =
23	23
24	24	Measure out the ground and power signals by comparing with other chips on board. E.g. we find [SAA1064T] datasheet, locate the GND (Vee) and 5V (Vcc) and measure connectivity (0 ohm resistance) between chip pins and cable pins. This gives us pins GND 2 & 8 and PWR 16 & 22.
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150	150	{
151	151	}
152	152	{{/code}}
	143	+
	144	+== SAA1064T data for driving center IO LED stack ==
	145	+
	146	+Center IO stack is a stack of 23 LED's, 22 blue and 1 green for ethernet activity. These are duplicated next to each other and driven by each their SAA1064T chips. Earlier we found the i2c address and just by playing around figured out that 4 segments of 1 byte binary values are used to set ship register.
	147	+
	148	+{{code language="C++"}}
	149	+void fillColumns() {
	150	+ Serial.println("filling columns");
	151	+ Wire.beginTransmission(saa1064);
	152	+ Wire.write(1);
	153	+ Wire.write(0x7F); // 127 - 1111111
	154	+ Wire.write(0x7F); // 127 - 1111111
	155	+ Wire.write(0x7F); // 127 - 1111111
	156	+ Wire.write(0x1F); // 31 - 11111
	157	+ Wire.endTransmission();
	158	+
	159	+ colsFilled = 1;
	160	+}
	161	+{{/code}}
	162	+
	163	+(% class="wikigeneratedid" %)
	164	+Here the last byte we send only is 5 bits since we only have 5 LEDs instead of 6 to address (total of 23). Also note that we start the transmission with a single bit.
	165	+
	166	+== Pinouts voltages from MLB ==
	167	+
	168	+Powered off:
	169	+
	170	+* PWR fail LED - 0.00 V
	171	+* UID LED - 4.5V
	172	+* OH/Fan fail LED - 4.72 V
	173	+* NIC1 LED - 0.8 - 2.6 V
	174	+* NIC2 LED - 2.95 V
	175	+* UID SW - 2.8V
	176	+* HDD LED - 0.00 V
	177	+* Power LED P3V3 - 0.00V
	178	+* Power LED - 0.00 V after unplug grows
	179	+
	180	+Powered on:
	181	+
	182	+* PWR tail LED - 3.47 V
	183	+* UID LED - 4.85V
	184	+* OH/Fan failed LED - 5 V
	185	+* NIC 1 LED - 1.2 - 2.9 V
	186	+* NIC 2 LED - 3.2 V
	187	+* UID SW - 3V
	188	+* HDD LED - 3 V
	189	+* Power LED P3V3 - 3.30V
	190	+* Power LED - 0.87 V
	191	+
	192	+
153	153	)))
154	154
155	155
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164	164
165	165	[[image:[email protected]]]
166	166	//Figure 2: [[Waves>>https://commons.wikimedia.org/wiki/File:Culebra_-_Playa_de_Flamenco.jpg]]//
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167	167	)))
168	168	)))