[Coco] 128K EEPROM Cartridge board

[David Ladd]

Chad,

I personally like this idea :D
I would love to have a independent programmable program pack with banks.
This would allow me to make use of my CoCo2B that has issues till I can get
around to fixing it. :D

You have a fully assembled cost idea so we know how much to expect that we
would need to give to get such a product from yeah? :D  Thanks :D





On Sun, Jan 25, 2015 at 10:28 AM, Chad H <chadbh74 at hotmail.com> wrote:

> I was browsing prices on the 2764, 27128, 27256 and 27512 EPROMs this
> morning noticing how they are slowly getting more scarce, especially the
> 27128.  Also, the prices are not the best.  Ironically, at least to me, the
> 27512's with most capacity are the cheapest.
>
> Then I remembered I had a box of like 20 or so 29EE010 EEPROMs that I had
> ordered a few years ago. I only needed one to upgrade my Win'98 machines
> bios chip but was cheaper to buy the lot.  In any case, these are 128k
> parallel EEPROMs 150ns in the DIP 32-pin package and go for about $1.70
> easy.  Even better, I can get the PLCC version for $0.25.  I know my old
> Willem programmer works with them and I wouldn't have to wait on UV erase
> cycles.
>
> I have the idea of revamping the 2764-27512 EPROM boards I've been
> building, removing the existing DIP layouts and adding the option to mount
> either the DIP or PLCC version of the 29EE010.  I would also need to add
> one additional jumper for the A16 address line.  This would give more
> capacity for roms , each selectable by jumpers...
>
> 16 x 8K
> 8 x 16K
> 4 x 32K
>
> I'm going to go ahead and work up some prototypes on this.  I'm wondering
> how much interest would there be out there in this?
>
> - Chad
>
> Sent from my Transformer Infinity
>
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