[Coco] Updating a CoCo 1's CB and ECB ROMs

[camillus Blockx]

Well maybe, you have the room to stack up more then 2  ( the sky is the
limit ) in this case literally. The only thing that change is the way to
switch, it would be needing some switching circuit. Probably a 4017 up/dwn
counter with a push button and indicator. I think you can find smd
equivalents for those eproms so that gives you more space.

cba


On Wed, Dec 26, 2012 at 6:40 AM, Mark Ormond <markormond at mtxsystems.com>wrote:

> I installed a 27512 into a coco2 for a friend, it has arkanoid, Dungeons
> of Daggorath, Drivewire and one other I can't remember.
> I just piggy backed on one of the roms with an adapter and wired switches
> hidden underneath the cart port to select banks and to disable.
>
> -----Original Message-----
> From: coco-bounces at maltedmedia.com [mailto:coco-bounces at maltedmedia.com]
> On Behalf Of camillus Blockx
> Sent: Wednesday, December 26, 2012 2:17 AM
> To: CoCoList for Color Computer Enthusiasts
> Subject: Re: [Coco] Updating a CoCo 1's CB and ECB ROMs
>
> Hi juan,
>
> Is there room enough for stacking two eproms on top. (piggyback), Then you
> can leave out both the CE pins of the two eproms. Those pins you connect to
> a switch and the middle contact of the switch connects to the CE pin on the
> MB. Then you can switch from eprom A or eprom B.  Hope this make sense to
> you, mail me if you need more info, or a schematic.
>
> cba
>
>
> On Tue, Dec 25, 2012 at 10:24 PM, Juan Castro <jccyc1965 at gmail.com> wrote:
>
> > I've been mulling this for some time. Cloud9's DOS Adapter does in
> > fact just this (meant for the disk controller) but there's no way two
> > of them will fit side by side. (2.2 cm = 0.86 in)
> >
> >
> > http://picasaweb.google.com/lh/photo/FG64tPpeIkBej6KAUXzly29XcHdiH80re
> > A6_ygAbi6M
> >
> > Gustavo's CoCo 2 is like this. I don't know if the distance is the same:
> >
> >
> > https://plus.google.com/photos/109465536824672578462/albums/5826078853
> > 650364673/5826078966275100194
> >
> > I would need a PCB that goes into both sockets, and has one 27128 (or
> > perhaps a 27256 with a jumper for bank select) -- has anyone done
> > something like this? Cloud9 guys, do you think this would be viable as
> > a product? Or... Mark, what about a Flash version?
> >
> > Or, a simpler, dirtier solution: just one DOS Adapter, and then I pull
> > a wire from A13 to the proper pin of the socket. Would that work?
> >
> > Juan
> >
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> >
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