[Coco] EPROMS

[Dave Philipsen]

As cheap as 27256 EPROMs are you may want to investigate using them in all cases.  Most modern EPROM programmers will handle them with ease and they will probably program faster than a 2764 if you use the right brand and an intelligent programmer.  As Ed said, you just tie the unused high addresses hi or low and only use part of the EPROM. If you burn your 8K of code at $0000, $2000, $4000, and $6000 to fill up the entire 27256 then it won't matter which way the upper address lines are tied. If you tie any address lines hi, though, good practice would be to use a 4.7k or 10k resistor.

Dave

> On Aug 3, 2017, at 8:20 AM, Carlos Camacho <idevgames at gmail.com> wrote:
> 
> The advice on my question of buying modern low-voltage EPROMS to burn
> Extended BASIC for old CoCos was...
> 
> "2764 or 27C64 for the older CoCos (8K) and 27C256 for the CoCo 3 (32K)."
> 
> The 2764 is 8KB right, so that can handle the CoCos that have Color BASIC
> and Extended BASIC in different chips. How about for the CoCos that used a
> single chip which had both Color BASIC and Extended BASIC together?
> Wouldn't that need a 16K EPROM? If so, what is the recommendation?
> 
> Cheers,
> 
> Carlos
> 
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