[Coco] EEPROM

[dave at davebiz.com]

Thanks, Dave. I was unaware of those chips. After looking at their data sheets it seems they may have continued to use the “27” designation because of their strong similarities to a standard EPROM. It appears that both of them are programmed like an EPROM and that they can be erased only as a whole chip which is also similar to an EPROM but done electrically instead of with UV. 


-Dave Philipsen

> On Jun 24, 2024, at 10:24 AM, David Ladd via Coco <coco at maltedmedia.com> wrote:
> 
> On Sun, Jun 23, 2024 at 10:13 PM Dave Philipsen via Coco <
> coco at maltedmedia.com> wrote:
> 
>> Dave,
>> 
>> I think he is specifically looking for EEPROM. the 27 series is EPROM
>> and the 29 series is flash.
>> 
> 
> David,
> In this case if you look up the specifications of the SST27SF256 it is
> listed as a FLASH according to the datasheet.  I have used these in my
> CoCo3 without problems.  Also I have also used the W27C512 which is listed
> as an EEPROM.  So either cheap should work fine.
> 
> I tried to provide the PDF, but my last attempt of this message with the
> PDF was rejected by a moderator.  So you will have to look up the PDF for
> the SST27SF256 yourself.
> 
> 
>> 
>> 
>>> On 6/20/2024 1:08 PM, David Ladd via Coco wrote:
>>> <cut>
>> 
> 
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