[Coco] OS-9 80-column driver is ready

[Gene Heskett]

On Tuesday 24 September 2013 15:31:36 Bill Pierce did opine:

> That would be my question.... will it work under L2?
> If so, with an MPI (or DW ftm), it would give 2 monitors. I know Gene
> used to run his like that so he would know more of the limitations
> there.

I don't recall what address I actually wound up using, but it was up in 
that neck of the woods.  The WP-RS needs 4 addresses in the usual block, 
but the OEM decoding used 2 addrresses from the top of one 4 byte block, 
and 2 addresses from the bottom of the next block up, which meant it hogged 
8 of the coco's very valuable I/O addresses.  So the iron got warmed up & 
that got fixed, and the drivers defines fixed to reflect the fix, but 
AFAIK, none of that ever made it onto the copper leaving the place.

So I would suggest that its address needs, only 2 byte wide, should be made 
portable enough to put it anyplace in the $FF7X block except of course for 
the $FF7F of the MPI's control registers.
 
> Bill Pierce
> My Music from the Tandy/Radio Shack Color Computer 2 & 3
> https://sites.google.com/site/dabarnstudio/
> Co-Webmaster of The TRS-80 Color Computer Archive
> http://www.colorcomputerarchive.com/
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> 
> 
> 
> 
> -----Original Message-----
> From: tonym <tonym at compusource.net>
> To: CoCoList for Color Computer Enthusiasts <coco at maltedmedia.com>; coco
> <coco at maltedmedia.com> Sent: Tue, Sep 24, 2013 1:07 pm
> Subject: Re: [Coco] OS-9 80-column driver is ready
> 
> 
> Alibaba.com shows a few suppliers available...
> 
> http://www.alibaba.com/showroom/crt9128-000p.html
> 
> Rochester Electronics also:
> 
> http://www.rocelec.com/search/finished/CRT9128-000P/0/1/contains/?utm_so
> urce=supplyFrame&utm_medium=buyNow
> 
> Is this a board that can be easily replicated?
> Will your L1 driver work under L2?
> 
> Tony
> 
> 
> 
> ---- Original Message ----
> From: billg999 at cs.uofs.edu
> Sent: 9/24/2013 12:23:34 PM
> To: "CoCoList for Color Computer Enthusiasts" <coco at maltedmedia.com>
> Subject: Re: [Coco] OS-9 80-column driver is ready
> 
> > Well I call it protype because in fact it was a prototype made in 1985
> > by some company called PHB in Texas. Is what is written in the label
> > :P
> > 
> > I'm doing the schematics and I will try to make it in protoboard, but
> > it will take a while since I'm a software guy not a hardware.
> > 
> > But yes the circuit is so simple that it can be easily copied. I think
> > the most difficult part is to find the CRT9128.
> > 
> > I found in china the CRT9128-000P.  I hope is the same ? If the
> > protoboard works I can see the possibility to make a batch of it.
> 
> I did some quick research and it appears the "000P" is the same device
> probably refers to plastic as opposed to ceramic packaging.  The bad
> news is that they do not appear to be manufactured by anyone any more.
> 
> I wonder if there is some other similar but newer chip that could be
> designed into the circuit?
> 
> bill
> 
> 
> 
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Cheers, Gene
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