[Coco] [Color Computer] WordPak RS/CO80

[Boisy G. Pitre]

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
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>> 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
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