David wrote:
> The 3.71 rom works, as does the 'vanilla' 3.70 rom image I extracted
> from this RPC after a power on with shift & * (??) held down - the
> sha1sum of which equalled that of Ralph's so I know it's okay.
>
> At least this long sorry saga has highlighted the possible problem of
> patched rom images causing startup errors, and possibly running
> errors.
My guess is the blue screen is RISC OS detecting that some internal
checksum on the ROM isn't correct during POST. That vaguely rings a
bell on other earlier emulators. (So much gets learnt, forgotten, and
has to be re-learnt!) Perhaps it needs to be mentioned somewhere in the
rpcemu FAQ/troubleshooting section? Along with a link to known good
SHA1 digests. :-)
Would it be nice if rpcemu looked at the ROM image provided and gave a
warning it if wasn't recognised? Digging out the "MOS Utilities"
version and seeing if that matched the expected CRC-32-IEEE 802.3 may
stop these kind of issues. I say CRC-32 rather than SHA1 because it's
still good enough but much easier to compute in code. And it's what the
POSIX cksum(1) command gives too.
$ cksum *
1806840565 4194304 david
212344744 4194304 davidwife
2820737424 4194304 musus
2453876003 4194304 mybad
3184921365 4194304 mygood
3728305141 4194304 rolf3.60
4102711502 4194304 rolf3.71
$
Cheers,
Ralph.
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