I have a problem with 8051 interfacing to LCD. \nI have written a simple program that gets code from keyboard using interrupt and writes the key value to LCD. \nI have used 'Mazidi's Book' writing the program. But, when I have simulated the program by PROTEUS, it does not work correctly. I think it has problem on reading LCD busy flag. \nThe program is here: \n;3*4 KEYBOARD\n;KEYBOARD ROWS ARE ANDED TO INT0(PIN 12)\n;CHECK BUSY FLAG\n;LCD DBS CONNECTED TO PORT0\n;P3.3 CONNECTED TO E PIN\n;P3.6 CONNECTED TO RS PIN\n;P3.7 CONNECTED TO R/W PIN\n         ORG 0000H\n         LJMP MAIN\n;-----------------------\n         ORG 0003H\n         LJMP GET\n;------------------------\n         ORG 0030H\nMAIN:    MOV IE,#10000001B\n         MOV P1,#0F0H\n         SJMP $\n;--------------------------END OF MAIN\nDATA0:   DB "0) ZERO  ~"\nDATA1:   DB "1) ONE ~"\nDATA2:   DB "2) TWO ~"\nDATA3:   DB "3) THREE ~"\nDATA4:   DB "4) FOUR ~"\nDATA5:   DB "5) FIVE ~"\nDATA6:   DB "6) SIX ~"\nDATA7:   DB "7) SE
120226
wow an 8051. I wish i could help but it has been more than 10 years since i did anything with something like that.\n\nGood luck.
653896
Most laptops have a function key combination that enables the video to be displayed on a) the monitor only  b) external device or c) both simultaneously. First look for a function key on your laptop keyboard (usually one left of the Windows key), then look for a function key along the top row of F1 - F10/11/12 keys and look for an icon that looks display related, or it may say CRT/LCD. Press the Fn key then the CRT/LCD key (on my keyboard, a Dell Inspiron, it is on the F8 key) and wait a few seconds. Look at your screen and the projector screen to see what happens. If it displays you're set. If not press the key combination again. \n\nYou should verify that the cables from the projector are properly connected first obviously.\n\nOn the codec question, if the video is playing properly on your computer screen then it is not a codec issue. Codec has nothing to do with sending video/audio signal to an external monitor or projector, so you should be fine on that front.\n\nGood luck.
317646
I am sorry this may sound stupid. Just do it all over. Computers tend to skip something. If it does not work just email me. ~ jai bird (jai_jaibird@yahoo.com)
409014
First of all if you've checked that the monitor is still plugged to electricity and won't work, I recommend you to take it to a specialist, so it will give you a solution.
568732
#include <stdio.h>\n#include <dos.h>\n#include <conio.h>\n\n/********************************************/\n/*This program set the parallel port outputs*/\n/********************************************/\n\nvoid main (void)\n{\nclrscr();             /* clear screen */\noutportb(0x378,0xff); /* output the data to parallel port */\ngetch();              /* wait for keypress before exiting */\n}\n\njust check here you can get all info http://www.epanorama.net/circuits/parallel_output.html
516099
There should be a combination of keys you can push to get it to switch displays.  For Compaqs, I think it's Fn+F4.  For Dells, it's Fn+F8.\n\nSee if any of the keys on your keyboard has a picture of a monitor or the words "CRT/LCD," in a different color.  That, combined with your Fn key, usually tells the display to output somewhere else.  Good luck.  =)
574967
You can use a program such as AIDA32 (especially if you are using a board 2+ years old.\n\nOf course, the best thing is to provide more details.  Is this a Dell computer? A mac?  A white box (meaning a non-brand name)?  If so, then consult your manual.  Otherwise, consult the manufacturer.
539416
try coding ur own keyboard driver\n\nsuch that when A is pressed u translate it into a AB to the OS
463067
I'm guessing that the bar might be from a pc to monitor problem. The pc might have sent the monitor that bar and it stayed there because the monitor just froze it there. I suggest you do a system restore or system recovery. To do that, I'll give you instructions if you e-mail me at motiur41@aim.com.
371773
it will be in your display settings under colour adjustment \nor some computers you can adjuct useing the keys just consalt your manual \nelse it may be the backlight that has failed if it is an lcd monitor
502147
2 hours make it seem to me that some piece of Hardware is faulty. I have use this method several times.\n\nRemove an item of hardware you don't need. ie Sound card, or Network card, USB Devices. Graphics card, if it has on board Graphics.\n\nIf it hangs, remove something else. It works you've found your problem.\n\nOf course replace anything which isn't considered problematic
479060
Please check if the printer is a host based printer.\n\nselect an alternate printer icon as default printer and reset the printer icon as default printer icon,\n\nIf the status of printer is still offiline follow these steps :\n\n\nWhen a print job is sent to the printer from the computer, the printer\nwill not respond if:\n\n*  The Pause Printing or Use Printer Offline options are enabled.\n*  The Windows print spooler shows the printer status as either\n   Paused, Offline, Pending or User Intervention Required.\n*  Wrong printer driver is being used.\n*  The printer cable is not connected to the printer or the computer.\n\n     NOTE:  In many cases, there are no lights flashing on the printer\n            and no error messages appear on the screen.\n\nVerify that the printer cable is connected directly from the computer\nto the printer.  If the printer cable is connected and the printer does\nnot respond, follow the instructions provided below to determine why\nthe printer is not responding.\n\nFollow the instructions provided below to determine why the printer is\nnot responding.\n\n=== The printer is Paused or Offline ===\n\n1.  Click Start, then Printers and Faxes.\n2.  Right-click the icon for your printer and select Open.\n3.  Select 'Printer' from the menu bar and verify that there is no\n    check mark next to 'Pause Printing'.  If a check is present, click\n    the option to remove the check mark.\n4.  Select Printer from the menu bar and verify that the 'Use Printer\n    Offline' option is displayed.  If there is a check mark, click the\n    option to enable online printing.\n5.  In the status window, if there are individual documents that show a\n    Paused status, select the document in the print queue.  The\n    document will be highlighted.\n6.  Select Document in the menu bar.\n7.  If there is a check mark next to Pause Printing, select the Pause\n    Printing option to remove the check mark.  If Pause Printing is\n    not checked, press the ESC key on the keyboard to leave the menu\n    without making any changes.\n\nThe spooled document(s) should start printing once the check marks have\nbeen removed from the Pause Printing and Work Offline options.\n\n=== The wrong printer driver or port is being used ===\n\nIf there is more than one printer configured for use on the system, the\ndesired printer may not be configured as the default Windows printer or\nthe wrong printer driver may have been configured for use with the\nprinter.  Follow the steps given below to verify that the printer\ndriver is configured correctly.\n\nTo verify that the printer driver is set as default:\n\nIn the Printers and Faxes folder, right-click your printer icon, then\nclick the 'Set As Default Printer' option.  The selected printer driver\nshould now be set as the default driver.  (A small check mark will be\ndisplayed in the printer icon.)\n\n     NOTE:  If you wish to keep the existing printer as the default\n            printer, do not select 'Set As Default', press the ESC key\n            on your keyboard.  When you are ready to print, the correct\n            printer must be selected from within the application that\n            is creating the print job.  To do so, \n\n            a.  In the application used for printing click File\n            b.  Click Print.\n            c.  From the drop down menu, select the correct printer.\n\nTo verify the settings in the Printer Properties:\n\n1.  In the Printers and Faxes folder, right-click the icon for your\n    printer and select Properties.\n2.  Select the Advanced tab.\n3.  Verify that the 'Driver' entry shows the correct driver name for\n    the printer.  If not, select the correct printer driver from the\n    drop down menu.\n\n     NOTE:  If the printer driver is not listed, the printer driver may\n            be corrupt or incorrectly installed.  Reply to this\n            message.\n\n4.  Select the Ports tab.\n5.  Verify that t
271028
Most often this is caused by a bad video cable or connector.  Try tighting the video cable connectors at both ends.  If that doesn't work try wiggling the cable which some times works if the cable is shorting out.  If that's the case or there is no improvement, try replacing the video cable if it has connectors at both ends.  If it's an older display screen, the video cable may come out of the display screen chassis as a cable with no connector to the display.  If that's the case, then you may be out of luck because you won't be able to replace the cable.  You could try checking for bent pins in the connectors also, but these are hard to fix.  Bottom line, it's probably your cable, tighten it down at the connectors to see if that helps, if not replace cable, if display is old and cable can't be replaced, time to buy a new display!  Good luck!
155275
see if the connector pins on data and power of FDD are not broken.check that you have connect the data cable correctly.check the power connector too.\nif your FDD LED is always on its not working properly.
264582
guess its a faulty keyboard\n\ntry changing keyboard to find out , easiest remedy i would say \n\n- - - best of luck
520087
Try another keyboard first. It might fix you at least if the problem is software or hardware. I guess the keyboard is either wrongly connected (loose connectoR) or dead
252504
vertical oscillator/driver shot. shorted capacitor, or maybe transistor/ic? \nnowadays, you might as well trash it if you can get a halfway decent deal on a flat panel. or give it to your cousin who's MIT material to see if he can fix it.