6502.org

I just finished my prototype for displaying text on a 320x240 LCD display.

I used the same ATMega8 controller that I used for my composite text display. I am only using 320x200 as thats all the ATMega8's RAM can support but I still get a 40x25 character display. It uses the same 8 bit port with strobe & busy handshaking. An RS-232 interface could also be implemented if desired.

I bought the Optrex display from a local surplus store (they still have some left) and the power supply from jameco.com I don't think jameco sell it anymore but I did see it on a couple of other surplus sites.

If anyone is interested in building one, contact me and I can help find the necessary parts.

Here is a link to more details on my website:

http://www.softcom.net/users/darylr/io/vid4.html

Next, I'm working on a compact flash interface for mass storage.

Daryl

Very nice.

I've always chickened out and used the displays with the built in controllers, much easier than what you've done. 8^)=

Cheers,

Lee.

It may have been easier but those displays are much more costly. I spent $35 on the display and $9 on the power supply. And actually, the timing diagrams for the display were straight forward and easy to duplicate in software.

However, if you can find a reasonably cheap display with the built-in controller, all the better!!!

Daryl

VERY nice. Personally, I would have done a dedidcated 65c02 all its own with a massive graphics toolset and commands, but thats me. I still am not hep on Atmels or microcontrollers because of availability 2 decades from now.

It would be easy to do such. A 320x240 display only needs 9600 bytes to store the bit image. If you used phase 1 for the refresh, the 65c02 could spend all its time doing the graphics commands.

Daryl

I've been lucky, I found a source of 320 x 240 mono LCD displays with built in windowing graphics controller for a fiver each (about $10) and bought three. The hardest thing to do was source the -25v bias and 200vAC backlight supply before ploughing my way through the 148 page datasheet. The controller supports a background screen in either text or bitmapped graphics and up to three windows that can be any size up to a full screen size.

Just wish they were colour. 8^)=

Lee.

$10 huh? Wish my surplus store was that cheap!

Cheers!

Daryl

Manuf link to the screen used: for about 67 bucks new that isnt bad for a screen.

http://www.optrex.com/Products/PartDeta ... -FW-ABE-AU

Nice job as always Daryl. I still need to build my sbc 2 here. Any ideas to make a color graphical interface in the future?

I will probably do something using VGA 640x480 or purhaps 800x600.

But first, my compact flash firmware is waiting to be written.

Thanks!

Daryl

I will probably do something using VGA 640x480 or purhaps 800x600.

But first, my compact flash firmware is waiting to be written.

Thanks!

Daryl

Hrmm.. The ATMega32 has 2k instead of just 1k of memory. Might be a quick upscale of the design to add those last 40 pixels.

Once again I'm impressed.

Daryl keeps coming up with such really neat ideas.

Cheers,

Brian

Thanks! It is fun to create a new design from scratch, and rewarding to see it running. I won't tell you all about the hours I spent scratching my head because it wasn't working!!!

Yes, the ATMega32 would be a good candidate for using the last 40 rows. I had considered trying to write code to support a clock or something using that space, but then got busy and it never happened.

I hope some of these designs will find a use in other's projects.

Daryl

Yeah.... hopefully I'll be able to spend some time on it sometime soon, if you don't beat me to it...

The way I see it, stuff like that is cool and useful in ways that far exceed the bounds of the 6502 community. Swap the interface from an 8 bit parallel interface to a SPI or USART one, and the AVR and PIC folks can use it, for example.

Now I just gotta try and scare up some surplus LCDs of the proper specifications..