[Coco] [Color Computer] WordPak RS/CO80

[jdaggett at gate.net]

Boisy

At least now you are beyond the fumbling around and crawling 
stage. Motorola licensed several alternate vendors for teh basic 
6845 CRTC desing. MOS Tek and Synertek were among two. It 
seems that there were a few vendors that decided to add t heir own 
little caveats to the basic design. Even the Motorola MC6845-1 has 
some "improvements" over the MC6845 original design. 

Good luck and happy hunting. 


james


On 6 Jan 2005 at 18:59, Boisy G. Pitre wrote:

From:           	"Boisy G. Pitre" <boisy at boisypitre.com>
Subject:        	Re: [Coco] [Color Computer] WordPak 
RS/CO80
Date sent:      	Thu, 6 Jan 2005 18:59:01 -0600
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> James,
> 
> Your research has paid off.  I wasn't aware that Synertek made a
> replacement 6545.
> 
> The data at that website works for this chip, albeit slightly 
> differently.  I am now able to use R18, R19 and R31 to put characters
> on the screen.
> 
> There is still something awkward.  Characters from below $40 emit
> latin characters, not numbers or symbols.  And there doesn't seem to
> be lowercase... just uppercase, even for lowercase ASCII characters. 
> I don't know if there are multiple character sets in the CHARGEN ROM
> or not.  So there still appears to be some hocus pocus about this
> thing.
> 
> Boisy
> 
> On Jan 6, 2005, at 2:33 PM, jdaggett at gate.net wrote:
> 
> > Boisy
> >
> > Doing some more internet searching, I came across a web page
> > that is about an 80 column card for the Sharp MZ-700 that is based
> > on the Synertek SY6545 Chip.
> >
> >> From what I gather this is the prodedure this
> >
> > 1) Write to location to set R18 and R19 with the video address
> > 2) Write to location of the data latch
> > 3)Write to I/O and register 31.
> >
> > The write to register 31 tells the CRTC that the update address in
> > R18 and R19 is valid.
> >
> > here the link
> >
> > http://www.sharpmz.org/mz-700/80zkup.htm
> >
> > james
> >
> > On 6 Jan 2005 at 12:26, Boisy G. Pitre wrote:
> >
> > From:           	"Boisy G. Pitre" <boisy at boisypitre.com>
> > Subject:        	Re: [Coco] [Color Computer] WordPak
> > RS/CO80
> > Date sent:      	Thu, 6 Jan 2005 12:26:42 -0600
> > To:             	CoCoList for Color Computer Enthusiasts
> > <coco at maltedmedia.com>
> > Send reply to:  	CoCoList for Color Computer Enthusiasts
> > <coco at maltedmedia.com>
> > 	<mailto:coco-
> > request at maltedmedia.com?subject=unsubscribe>
> > 	<mailto:coco-
> > request at maltedmedia.com?subject=subscribe>
> >
> >> James,
> >>
> >> Thanks for the information.  It sheds some light, but I am still
> >> uncertain where I write the actual character.  R18 and R19 tell the
> >> 6545 which way to set the address lines to the RAM, but now I need
> >> to know how to get the character into the RAM chip itself.
> >>
> >> Boisy
> >
> >
> >
> > -- 
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> >
> --
> Boisy G. Pitre
> E-Mail: boisy at boisypitre.com
> Mobile: (337) 781-3997
> Web: www.boisypitre.com
> 
> 
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