LCD pads on mainboard

Posted by: Narkotic

LCD pads on mainboard - 26/09/2003 14:20

Hey guys... after opening the empeg and having bad luck... I noticed some little pads next to the CPU labeled LCD. I guess this is directed towards the developers of the empeg.. What do these pads do? Is this an abandoned idea for having an external LCD display? I'd take a picture of the pads but my player is on its way to Eutronix.

I tried to search for this first, on the FAQ and this board and saw nothing about it. Very surprising.. Unless my searching skills suck.
Posted by: robricc

Re: LCD pads on mainboard - 26/09/2003 14:28



This is from an Mk2 board. LCD headers visible right under where the CPU would be.
Posted by: Narkotic

Re: LCD pads on mainboard - 27/09/2003 16:07

AH! Thanks Rob. Since I had a hard time playing wheres waldo, i'm going to attach the picture with the pads illustrated. Anyone have any ideas?
Posted by: pca

Re: LCD pads on mainboard - 28/09/2003 19:42

Yes.

pca
Posted by: RobotCaleb

Re: LCD pads on mainboard - 28/09/2003 19:58

.heh.
Posted by: Narkotic

Re: LCD pads on mainboard - 28/09/2003 22:40

aw, c'mon... something?
Posted by: johnmcd3

Re: LCD pads on mainboard - 29/09/2003 00:57

I believe the "Yes" was in responding to "Is this an abandoned idea for having an external LCD display?".

We talked about it a tiny bit this summer in Amersfoort this summer.

John
Posted by: Narkotic

Re: LCD pads on mainboard - 29/09/2003 10:06

oh.. ok. So these pads have been abandoned and they serve no purpose at all?
Posted by: altman

Re: LCD pads on mainboard - 30/09/2003 06:16

They're the signals for a TFT panel; however, there are only 8 of them (the other 8 are GPIOs 2-9, which are very much in use). If you disabled the display, you could in theory drive an 8-bit active display - or even a TV out, using something like the Chrontel CH7003. ISTR there's LCD0-7, PCLK, LCLK and FCLK.

Another thing you could do is use bits 1-3 of the video data (the VFD only uses one in every 4 pixels from the video controller) and easily hook up another 3 displays that could show different things

Hugo
Posted by: Daria

Re: LCD pads on mainboard - 30/09/2003 08:30

Another thing you could do is use bits 1-3 of the video data (the VFD only uses one in every 4 pixels from the video controller) and easily hook up another 3 displays that could show different things


Easily is relative, if I tried surface mount soldering I'd probably have a brick, but that would be cool. Imagine one display for gpsapp, one for whatever the next cool hack is, and one for the player visualizations. Seems like overkill to move the lyrics away from the player visualization but you could do that too.
Posted by: Narkotic

Re: LCD pads on mainboard - 30/09/2003 17:22

COOL! Well, I guess that answers my question. Too bad I don't understand much of it. Thanks