I DID IT! I not only got the six channel logic analyzer to work, but I have also succeeded in breaking the 2 million samples per second limit. Here is the video of it working on YouTube: YouTube Video Here is a close up of the screen showing the outputs of a 74LS390, with a 10 MC clock input. The top trace is 100 KC and the bottom one is 1 MC. How did I do it? The sample rate is much faster, if you code it like this: sample[1]=PINC sample[2]=PINC sample[3]=PINC sample[4]=PINC sample[5]=PINC sample[6]=PINC sample[7]=PINC sample[8]=PINC sample[9]=PINC sample[10]=PINC etc. It takes a while to type in the code, but using a "loop" slows the sampling time down by more than 50%! Blogger keeps trashing my code buy hopefully here it is; /*********************************** 128 by 64 LCD Logic Analyzer 6 channel and 3Mb/s By Bob Davis Uses Universal 8bit Graphics Library, http://code.google.com/p/u8glib/ Copyright (c) 2012, [email protected] All rights reserved. ********************************************/ #include "U8glib.h" // 8Bit Com: D0..D7: 8,9,10,11,4,5,6,7 en=18, di=17,rw=16 //U8GLIB_ST7920_128X64_4X u8g(8, 9, 10, 11, 4, 5, 6, 7, 18, 17, 16); // **** NOTE **** I Moved the three control pins !!! U8GLIB_ST7920_128X64_4X u8g(8, 9, 10, 11, 4, 5, 6, 7, 1, 2, 3); int Sample[128]; int Input=0; int OldInput=0; int xpos=0; void u8g_prepare(void) { u8g.setFont(u8g_font_6x10); u8g.setFontRefHeightExtendedText(); u8g.setDefaultForegroundColor(); u8g.setFontPosTop(); } void DrawMarkers(void) { u8g.drawFrame (0,0,128,64); u8g.drawPixel (20,1); u8g.drawPixel (40,1); u8g.drawPixel (60,1); u8g.drawPixel (80,1); u8g.drawPixel (100,1); u8g.drawPixel (20,62); u8g.drawPixel (40,62); u8g.drawPixel (60,62); u8g.drawPixel (80,62); u8g.drawPixel (100,62); } void draw(void) { u8g_prepare(); DrawMarkers(); // wait for a trigger of a positive going input Input=digitalRead(A0); while (Input != 1){ Input=digitalRead(A0); } // collect the analog data into an array // No loop is about 50% faster! Sample[1]=PINC; Sample[2]=PINC; Sample[3]=PINC; Sample[4]=PINC; Sample[5]=PINC; Sample[6]=PINC; Sample[7]=PINC; Sample[8]=PINC; Sample[9]=PINC; Sample[10]=PINC; Sample[11]=PINC; Sample[12]=PINC; Sample[13]=PINC; Sample[14]=PINC; Sample[15]=PINC; Sample[16]=PINC; Sample[17]=PINC; Sample[18]=PINC; Sample[19]=PINC; Sample[20]=PINC; Sample[21]=PINC; Sample[22]=PINC; Sample[23]=PINC; Sample[24]=PINC; Sample[25]=PINC; Sample[26]=PINC; Sample[27]=PINC; Sample[28]=PINC; Sample[29]=PINC; Sample[30]=PINC; Sample[31]=PINC; Sample[32]=PINC; Sample[33]=PINC; Sample[34]=PINC; Sample[35]=PINC; Sample[36]=PINC; Sample[37]=PINC; Sample[38]=PINC; Sample[39]=PINC; Sample[40]=PINC; Sample[41]=PINC; Sample[42]=PINC; Sample[43]=PINC; Sample[44]=PINC; Sample[45]=PINC; Sample[46]=PINC; Sample[47]=PINC; Sample[48]=PINC; Sample[49]=PINC; Sample[50]=PINC; Sample[51]=PINC; Sample[52]=PINC; Sample[53]=PINC; Sample[54]=PINC; Sample[55]=PINC; Sample[56]=PINC; Sample[57]=PINC; Sample[58]=PINC; Sample[59]=PINC; Sample[60]=PINC; Sample[61]=PINC; Sample[62]=PINC; Sample[63]=PINC; Sample[64]=PINC; Sample[65]=PINC; Sample[66]=PINC; Sample[67]=PINC; Sample[68]=PINC; Sample[69]=PINC; Sample[70]=PINC; Sample[71]=PINC; Sample[72]=PINC; Sample[73]=PINC; Sample[74]=PINC; Sample[75]=PINC; Sample[76]=PINC; Sample[77]=PINC; Sample[78]=PINC; Sample[79]=PINC; Sample[80]=PINC; Sample[81]=PINC; Sample[82]=PINC; Sample[83]=PINC; Sample[84]=PINC; Sample[85]=PINC; Sample[86]=PINC; Sample[87]=PINC; Sample[88]=PINC; Sample[89]=PINC; Sample[90]=PINC; Sample[91]=PINC; Sample[92]=PINC; Sample[93]=PINC; Sample[94]=PINC; Sample[95]=PINC; Sample[96]=PINC; Sample[97]=PINC; Sample[98]=PINC; Sample[99]=PINC; Sample[100]=PINC; Sample[101]=PINC; Sample[102]=PINC; Sample[103]=PINC; Sample[104]=PINC; Sample[105]=PINC; Sample[106]=PINC; Sample[107]=PINC; Sample[108]=PINC; Sample[109]=PINC; Sample[110]=PINC; Sample[111]=PINC; Sample[112]=PINC; Sample[113]=PINC; Sample[114]=PINC; Sample[115]=PINC; Sample[116]=PINC; Sample[117]=PINC; Sample[118]=PINC; Sample[119]=PINC; Sample[120]=PINC; Sample[121]=PINC; Sample[122]=PINC; Sample[123]=PINC; Sample[124]=PINC; Sample[125]=PINC; Sample[126]=PINC; Sample[127]=PINC; // display the collected analog data from array for(int xpos=0; xpos<128; xpos++) { u8g.drawLine (xpos, ((Sample[xpos]&B00000001)*4)+4, xpos, ((Sample[xpos+1]&B00000001)*4)+4); u8g.drawLine (xpos, ((Sample[xpos]&B00000010)*2)+14, xpos, ((Sample[xpos+1]&B00000010)*2)+14); u8g.drawLine (xpos, ((Sample[xpos]&B00000100)*1)+24, xpos, ((Sample[xpos+1]&B00000100)*1)+24); u8g.drawLine (xpos, ((Sample[xpos]&B00001000)/2)+34, xpos, ((Sample[xpos+1]&B00001000)/2)+34); u8g.drawLine (xpos, ((Sample[xpos]&B00010000)/4)+44, xpos, ((Sample[xpos+1]&B00010000)/4)+44); u8g.drawLine (xpos, ((Sample[xpos]&B00100000)/8)+54, xpos, ((Sample[xpos+1]&B00100000)/8)+54); } } void setup(void) { pinMode(A0, INPUT); pinMode(A1, INPUT); pinMode(A2, INPUT); pinMode(A3, INPUT); pinMode(A4, INPUT); pinMode(A5, INPUT); // assign default color value if ( u8g.getMode() == U8G_MODE_R3G3B2 ) u8g.setColorIndex(255); // RGB=white else if ( u8g.getMode() == U8G_MODE_GRAY2BIT ) u8g.setColorIndex(3); // max intensity else if ( u8g.getMode() == U8G_MODE_BW ) u8g.setColorIndex(1); // pixel on, black } void loop(void) { // picture loop // u8g.firstPage(); do { draw(); } while( u8g.nextPage() ); // rebuild the picture after some delay delay(100); }