memcals

[Dave]

-----Original Message-----
From: Shannen Durphey <shannen at grolen.com>
To: gmecm at diy-efi.org <gmecm at diy-efi.org>
Date: Wednesday, May 02, 2001 2:41 AM
Subject: Re: memcals


>Yes, that's correct.
>
>Is this an image that you've successfully burned into an eprom before?


Yes, plenty of times.


>A 16k image should start at 0x4000 in a 27c256 eprom, and should continue
until the
>end of the eprom.
>I used to use a hex editor to copy -n- paste the image to itself to get the
proper
>size file.


This might be a stupid question, but, the addresses 0x4000 - 0x3fff are they
the upper half or the lower half?
I put the 16k image in 0x000 - 0x3fff, is that what I did wrong?



>If you read the file back from the eprom, does it match the original when
viewed
>with a hex editor?


Yes

>If your original file is directly from a gm eprom, it may already be
"double
>stuffed."  GM often uses 27c256's where a only 128 is needed.  In those
cases, the
>contents of the lower half is unpredictable.
>Shannen
>
>Dave wrote:
>>
>> -----Original Message-----
>> From: Shannen Durphey <shannen at grolen.com>
>> To: gmecm at diy-efi.org <gmecm at diy-efi.org>
>> Date: Tuesday, May 01, 2001 10:10 AM
>> Subject: Re: memcals
>>
>> >Place the image into the upper half of the eprom.
>> (27C128 ----> 27C256)
>> I tried that today and the ecm rejected it.  What am I doing wrong?  I
left
>> the lower half blank (ff,ff,ff etc..). Is this correct?
>>
>> Dave.
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