At 01:37 PM 7/14/2002, Hugh Graham wrote:
> > Actually, having picked through the dump in my hand patching, the end of
> > the image is all 00's apart from the last 4 bytes. Would this be the
> > checksum of the firmware perhaps?
>
>I think it's likely that when DEC increased the firmware from 256KB in
>4k60 to 512KB in 4k90 they just had a lot of space they didn't need.
>Those last 4 bytes could well be the checksum, but I have no idea what
>method they use to derive it.

Where's a valid image I can peruse?  I can probably figure it out.
My guess is either a CRC-32 or a simple SUM32.


-- 
Matt Thomas               Internet:   matt@3am-software.com
3am Software Foundry      WWW URL:    http://www.3am-software.com/bio/matt/
Cupertino, CA             Disclaimer: I avow all knowledge of this message