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01/31/06 22:09
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#108842 - Using a 74HC245 to drive NTSC or VGA
I have a circuit that uses a 74HC245 to drive a Toshiba T6963C controller for an LCD module over a ribbon cable. I believe the cable carries 8-bit data. I am trying to find more info but getting the schematic might be tricky.

From the 8052 based tv diplay post, I understand it is possible to drive a 4 by 2 line character display like from Mr. Predko's NTSC signal generator. The LCD I want to replace measures about 2.5 in by 6 in. and is backlit and has several lines of ascii or psuedo ascii alpha-numeric characters.

What I want to do is to take the 8-bit data into a Video DAC and hopefully use some frame store (Stretching out a little for me) to get a pretty stable display. My problem is I can definitely build such a circuit but I need a complete list of parts with which to do it. Some of the descriptions are just a little too vague for my technical skills. I do however, have the component level hardware fabrication skills. But if someone can direct me to where I can get a complete schematic for even a little more sophisticated circuit, I would greatly be appreciative. It is my impression that I might not need to do any programming.

My monitor is actually an 8 inch vga monitor that also has ntsc, pal, and s-video inputs and has a usb touchscreen.
The monitor has switches on the front that allow the inputs to be selected like a tv monitor. I am using the vga with a computer so several other options are there for the 8-bit data to come in. Can someone please point me in the right direction or post a solution?

Grateful in advance,

Curtis

List of 33 messages in thread
TopicAuthorDate
Using a 74HC245 to drive NTSC or VGA            01/01/70 00:00      
   I hope you know what you're getting into            01/01/70 00:00      
      Reply to LCD to "Video" post            01/01/70 00:00      
         Respectfully and humbly            01/01/70 00:00      
            '245            01/01/70 00:00      
            Maybe there's some info missing ...            01/01/70 00:00      
               To clear all this up            01/01/70 00:00      
               Windows GUI and my apology            01/01/70 00:00      
                  You'll need a few parts ...            01/01/70 00:00      
                     Programming and the such            01/01/70 00:00      
                        It's not going to be easy ...            01/01/70 00:00      
                        8051 to ISA Video Card.            01/01/70 00:00      
         do you even need video?            01/01/70 00:00      
         Mini-ITX            01/01/70 00:00      
            Nano-ITX            01/01/70 00:00      
      VGA timing            01/01/70 00:00      
         VGA timing            01/01/70 00:00      
   video driver hardware            01/01/70 00:00      
      not only video generation            01/01/70 00:00      
      Your post            01/01/70 00:00      
   ooops what am i thinking            01/01/70 00:00      
   Info Request.            01/01/70 00:00      
      lemme understand this correctly            01/01/70 00:00      
         Modifications to vga driver            01/01/70 00:00      
   Here's the datasheet ...            01/01/70 00:00      
   Re: LCD Upgrade            01/01/70 00:00      
      nice, but why            01/01/70 00:00      
      Looks Great!            01/01/70 00:00      
         it's because...            01/01/70 00:00      
      20 pin package controller            01/01/70 00:00      
         which post? ehich device?            01/01/70 00:00      
         What he means is ...            01/01/70 00:00      
         Re: 20-pin DIP controller            01/01/70 00:00      

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