istar1018 wrote:Do you have ROM dumps somewhere?
istar1018 wrote:Very cool that you got your Power Express working!!
So are you using the digibarn ROMs, or did you make your own SIMM? Do you have ROM dumps somewhere?
Dennis Nedry wrote:istar1018 wrote:Do you have ROM dumps somewhere?
YES, good question - because we could then pull the startup sound from the appropriate ROM dump so we could hear it!! I've never found a single recording or extraction of this sound on the internet.
Please share the ROM dumps if you have them!
LCGuy wrote:This is very cool...now with any luck, the maybe....5 other people who have Power Expresses will be able to get them up and running. People have been trying to get these things to boot for years. Very awesome.
jimjamyahauk wrote:I thought I'd heard the unusual second boot sound the PEX makes - it's the same as the one that had been previously uncovered by Applefritter members: http://www.applefritter.com/node/3376
Dennis Nedry wrote:Here is an AIFF audio extraction from the original flash chips:
And here is an extraction from the Digibarn chips:
NOTE that the sound is problematic due to the stuck bit.
I believe that the interleave is configured as 4 bytes from even, 4 bytes from odd, 4 even, 4 odd, etc.
jimjamyahauk wrote:I've re-extracted the Digibarn chips and uploaded with the same file name - so please re-download.
Dennis Nedry wrote:jimjamyahauk wrote:I've re-extracted the Digibarn chips and uploaded with the same file name - so please re-download.
It appears to still have the same stuck bit. The even dump should start with 0x 4800 0008, and it still starts with 0x 5810 1018.
I suppose it must be your dumper, or the way that you've hooked it up to your dumper, seeing as how the flash chips work when installed in the PEX. It could also be a timing problem with your dumper, which could maybe be fixed by reducing the speed.
Something else that might work - maybe you could swap the data bits around? You could put them in reverse order or something. If you re-dump with a different bit stuck (so the currently missing bit gets through on a different bit), I could easily combine the dumps together into one complete, accurate dump. We can verify because the beginning your original ROM and the digibarn flash ROMs are identical.
macgeek417 wrote:What's the differance between the flash chips and the rom simm?
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