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

[Mark Ormond]

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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