[Coco] 68764/68766 EPROMs

[Zippster]

I considered that, but I just want these to be simple, drop in alternatives
to a real ECB or CB ROM.  And your boards are there if someone wants
more features.  I found a source for a large number of very cheap
once-programmable 27128s that should go perfectly with this.

Yes, the cap is probably unnecessary, but I bought a full reel of these for just
a couple of bucks, and a little extra decoupling won’t hurt.

- Ed


> On Sep 21, 2015, at 10:22 PM, RETRO Innovations <go4retro at go4retro.com> wrote:
> 
> On 9/21/2015 7:35 PM, Zippster wrote:
>> Yeah, I’d be surprised if there weren’t half a dozen out there…
>> 
>> This one keeps it simple and even says “CoCo” on it.   :)
>> 
>> I’ll take a peek at a few motherboards for clearance, but there’s an
>> American CoCo in front of me now.  Did it pretty quick, but I think I
>> got everything right.
>> 
>> <https://drive.google.com/open?id=0B1sgl615FlGnTkdpcWpzeVVxV2s <https://drive.google.com/open?id=0B1sgl615FlGnTkdpcWpzeVVxV2s>>
>> 
>> - Ed
> I'd pull the top address lines on the 27XXX pinout out so folks can do multi-banks if desired.  Not much needed.  I don't think you need the .1uF cap there, as the socket will have a cap already.
> 
> Jim
> 
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