[Coco] MC6847 ( Motorola DS9823)

[Luis Antoniosi (CoCoDemus)]

as for the double speed poke my coco2b does support 65495,0 but not
65497,0. Well it does survives the last one but with garbled screen while
the poke is active.

interesting to say it came with a MC6809EP and now I replaced for a
MC68B09EP since the old one blew the HALT line.

On Thu, Mar 21, 2013 at 10:53 PM, Stephen H. Fischer <
SFischer1 at mindspring.com> wrote:

>
> ----- Original Message ----- From: "Bill Pierce" <ooogalapasooo at aol.com>
> To: <coco at maltedmedia.com>
> Sent: Thursday, March 21, 2013 7:24 PM
> Subject: Re: [Coco] MC6847 ( Motorola DS9823)
>
>
>
>> Since the real search is for the datasheet for the MC6847T1,
>>
>
> Hi,
>
> My printed CoCo 2 Service Manual does NOT have the appendix.
>
> I now have confirmed that I did not find a CoCo 2 Service Manual earlier in
> the day.
>
> I think that we did this same exercise a few years (Decades) ago.
>
> I did find this in the July 1985 Rainbow:
>
> ---------------------------
> . . . BUT WORKING ON IT
>
> Editor;
>
> Referring to Gary McConville's letter on
> Page 8 in the May 1985 rainbow that claims
> the new Motorola VDG chip (the 6847-T1)
> is "pin for pin" compatible with the old 6847,
> this contradicts the data my company has
> received from Motorola. The information
> about the 6847-T1 clearly shows it has a
> different pin configuration.
>
> Spectrum Projects is currently investigat-
> ing a satellite adapter board to retrofit older
> CoCos with the new VDG chip. The main
> advantage of this new chip is true lowercase
> letters instead of reverse video. Also, the
> new 26-3 134B and 26-3 136B CoCo 2s will
> fully support the double speed poke.
>
> Bob Rosen
>
> President, Spectrum Projects
>
> Woodhaven, NY
>
> ---------------------------
>
> No joy either with the alternate part number.
>
> SHF
>
>
> --
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>



-- 
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