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Model III & IV High Resolution cards
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Rogelio Perea  
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 More options Jul 5 2012, 3:22 pm
Newsgroups: comp.sys.tandy
From: Rogelio Perea <os9d...@gmail.com>
Date: Thu, 05 Jul 2012 15:22:13 -0400
Local: Thurs, Jul 5 2012 3:22 pm
Subject: Model III & IV High Resolution cards
While not a pressing matter, I have been looking for the Tandy issued
graphics card hardware for both the TRS-80 Models III & 4. Have not seen
any on Ebay nor Craigslist and beyond the references in some of the
TRS-80 related websites, there is no pictures to go by in case I happen
to stumble upon one at a flea market.

Anyone with some insight on where to find more info on this hardware
upgrade for the machines?

-- RP


 
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Grinder  
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 More options Jul 5 2012, 4:38 pm
Newsgroups: comp.sys.tandy
From: Grinder <grin...@no.spam.maam.com>
Date: Thu, 05 Jul 2012 15:38:30 -0500
Local: Thurs, Jul 5 2012 4:38 pm
Subject: Re: Model III & IV High Resolution cards
On 7/5/2012 2:22 PM, Rogelio Perea wrote:

> While not a pressing matter, I have been looking for the Tandy issued
> graphics card hardware for both the TRS-80 Models III & 4. Have not seen
> any on Ebay nor Craigslist and beyond the references in some of the
> TRS-80 related websites, there is no pictures to go by in case I happen
> to stumble upon one at a flea market.

> Anyone with some insight on where to find more info on this hardware
> upgrade for the machines?

I was hot to have one of those bad boys as well, but bought and built a
3rd party product (can't remember the name now) that was external and
also offered color.  I wrote some software for it, but lost interest
fairly quickly.

Here's a webpage for the RS one:

http://www.trs-80.org/radio-shack-model-4-high-resolution-board/

You've probably already seen that.

Unfortunately, I've never seen the card, or even a picture of the card.


 
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Clu  
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 More options Jul 6 2012, 6:05 pm
Newsgroups: comp.sys.tandy
From: Clu <dr...@swbell.net>
Date: Sat, 07 Jul 2012 02:05:11 +0400
Local: Fri, Jul 6 2012 6:05 pm
Subject: Re: Model III & IV High Resolution cards
Define "high resolution" in regards to the Model 3 and 4.

This should be interesting.  :P

Doc Clu

On 7/6/12 12:38 AM, Grinder wrote:


 
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Grinder  
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 More options Jul 6 2012, 9:50 pm
Newsgroups: comp.sys.tandy
From: Grinder <grin...@no.spam.maam.com>
Date: Fri, 06 Jul 2012 20:50:13 -0500
Local: Fri, Jul 6 2012 9:50 pm
Subject: Re: Model III & IV High Resolution cards
I guess you couldn't be bothered to follow the conspicuous link to find
your answer?

On 7/6/2012 5:05 PM, Clu wrote:


 
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Michael Black  
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 More options Jul 6 2012, 9:51 pm
Newsgroups: comp.sys.tandy
From: Michael Black <et...@ncf.ca>
Date: Fri, 6 Jul 2012 21:51:09 -0400
Local: Fri, Jul 6 2012 9:51 pm
Subject: Re: Model III & IV High Resolution cards

On Sat, 7 Jul 2012, Clu wrote:
> Define "high resolution" in regards to the Model 3 and 4.

> This should be interesting.  :P

> Doc Clu

"Higher resolution" than was built in.  Low resolution compared to what's
available today.

I dragged home a 3GHz computer on Sunday, and it "only" has 512megs of RAM
in it, and then I grumbled as a chunk of that was used for the built in
video interface, that is much more advanced than what was in the Radio
Shack computers (the fact that it uses a "big chunk" of RAM is an
indicator of that).  The best permanent storage I had up to late 1993 was
720K of disk space on a 3.5" floppy on my CoCo III.  Of course, that
computer had 512K of RAM, after I upgraded it.  It's a near infinite
increase in computing specs, in 20 years.

    Michael


 
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Alpinist Petrofsky  
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 More options Jul 7 2012, 6:34 pm
Newsgroups: comp.sys.tandy
From: Alpinist Petrofsky <alpin...@petrofsky.org>
Date: 07 Jul 2012 15:34:09 -0700
Local: Sat, Jul 7 2012 6:34 pm
Subject: Re: Model III & IV High Resolution cards

Rogelio Perea <os9d...@gmail.com> writes:
> While not a pressing matter, I have been looking for the Tandy issued
> graphics card hardware for both the TRS-80 Models III & 4. Have not
> seen any on Ebay nor Craigslist and beyond the references in some of
> the TRS-80 related websites, there is no pictures to go by in case I
> happen to stumble upon one at a flea market.

> Anyone with some insight on where to find more info on this hardware
> upgrade for the machines?

I don't know of any pictures of complete boards, but in the service
manuals you can find a lot of information, including the board circuit
traces and component-label silkscreens.  You could identify a board by
looking for the part number 8709297 or 8709397 (for Model III or 4)
written as part of the solder-side circuit trace.

The 26-1125 service manual, "TRS-80 Model III Computer Graphics
Upgrade Kit", was scanned by David J. Cooper in 2010 and made
available at his Marmotking archive, here:
http://marmotking.com/327a0f31bb7061464c18469d8dd1e999/downloads.html

For the Model 4 graphics board, see either the Model 4 service manual
or the Model 4P service manual.  A copy of the latter, scanned by
Larry Fosdick in 2005, can currently be found at multiple locations,
including these:
http://www.classiccmp.org/cpmarchives/trs80/Library/Manuals/Hardware/...
http://www.1000bit.it/support/manuali/trs/Model%204P%20Service%20Manu...

-al


 
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Rogelio Perea  
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 More options Jul 23 2012, 8:24 pm
Newsgroups: comp.sys.tandy
From: Rogelio Perea <os9d...@gmail.com>
Date: Mon, 23 Jul 2012 20:24:28 -0400
Local: Mon, Jul 23 2012 8:24 pm
Subject: Re: Model III & IV High Resolution cards
On 07/07/2012 06:34 PM, Alpinist Petrofsky wrote:

> The 26-1125 service manual, "TRS-80 Model III Computer Graphics
> Upgrade Kit", was scanned by David J. Cooper in 2010 and made
> available at his Marmotking archive, here:
> http://marmotking.com/327a0f31bb7061464c18469d8dd1e999/downloads.html

> For the Model 4 graphics board, see either the Model 4 service manual
> or the Model 4P service manual.  A copy of the latter, scanned by
> Larry Fosdick in 2005, can currently be found at multiple locations,
> including these:
> http://www.classiccmp.org/cpmarchives/trs80/Library/Manuals/Hardware/...
> http://www.1000bit.it/support/manuali/trs/Model%204P%20Service%20Manu...

Thanks for the heads up, had not thought of checking on the service
manuals - will do now!

-- RP


 
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Clu  
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 More options Aug 3 2012, 1:23 pm
Newsgroups: comp.sys.tandy
From: Clu <dr...@swbell.net>
Date: Fri, 03 Aug 2012 20:23:06 +0300
Local: Fri, Aug 3 2012 1:23 pm
Subject: Re: Model III & IV High Resolution cards
 > On 7/6/2012 5:05 PM, Clu wrote:
 >> Define "high resolution" in regards to the Model 3 and 4.
 >>
 >> This should be interesting. :P
 >>
 >> Doc Clu
 >>

On 7/7/12 4:50 AM, Grinder wrote:

> I guess you couldn't be bothered to follow the conspicuous link to find
> your answer?

>>> http://www.trs-80.org/radio-shack-model-4-high-resolution-board/

Wow... those WERE nice graphics.  I mean even now I look at those crisp
graphics, compare it to the regular graphics of the TRS-80 and think...
that is damn good.  Where can I get one of those?   Be fun to use from
some BBSing.

But then I slap myself back to the present day.  :P


 
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