[Coco] LCD panel

[jdaggett at gate.net]

Mike

The Oki MSM6522 is a specific chip designed to drive monchrome 
graphic LCD panels. It is  not a microprocessor in the sense of the 
6809 etc. 

It is an interface chip that takes data from the say the 6809 and 
feeds it to the display. From a properly selected clock, it will 
generate all the s yncs and pixel clocks and output it to the LCD 
serially,  in 4 bit mode or 8 bit mode. It is the big brother of the 
44780 LCD driver chips. 

james

On 20 Aug 2004 at 23:44, KnudsenMJ at aol.com wrote:

From:           	KnudsenMJ at aol.com
Date sent:      	Fri, 20 Aug 2004 23:44:24 EDT
Subject:        	Re: [Coco] LCD panel
To:             	coco at maltedmedia.com
Send reply to:  	CoCoList for Color Computer Enthusiasts 
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> In a message dated 8/20/04 6:30:39 PM Eastern Daylight Time, 
> jdaggett at gate.net writes:
> 
> > You can use a controller chip like the Oki MSM6255 or equivalent. 
> >  Single chip, plus some gluelogic, and crystal interfaced to a
> >  microprocessor buss. 
> 
> Is that Oki chip as fast as a 6502 or 6809 would be?  How fast a
> clock? Still, your 6809 or whatever CPU has to get the data out to the
> Oki controller to put into the LCD.  Or could youbuild a system
> whereby the Oki got the odd-numbered clocks to do video RAM access,
> just like the Coco's graphics?
> 
> >  The neat thing with this panel is that you can write to the upper
> >  and lower half at the same time.
> 
> Different data, I hope.  Using the upper and lower nybbles of each
> data byte? 
>  I need to go study the spec sheet with its logic and timing diagrams,
>  though 
> it clearly was not written by native-born English speakers.  Thanks,
> Mike K.
> 
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