bazzano
Posts: 2
Joined: Wed Nov 28, 2018 1:23 pm

Wrong rom dump

Wed Nov 28, 2018 3:28 pm

Hello.
I discovered a bug in a rom dump for the system Z80NE (ep382.ic5), due to a typo I made 40 years ago (!!!).
The corrected rom dump is now available on my site here (I have permissions to publish it): http://www.z80ne.com/software/eprom%20382/ep382.bin

Perhaps do you know who to contact to make a new hash of the rom file, so that the fixed rom works in mame?

Thank you very much.
Roberto Bazzano

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Robert
Posts: 65
Joined: Thu Nov 06, 2014 12:44 pm
Location: Land of Oz
Contact: Website

Re: Wrong rom dump

Thu Nov 29, 2018 2:52 am

I will put the new rom into the source of Z80ne.

What's the difference?

The original source was written by Roberto Lavarone, was that you?

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Robert
Posts: 65
Joined: Thu Nov 06, 2014 12:44 pm
Location: Land of Oz
Contact: Website

Re: Wrong rom dump

Thu Nov 29, 2018 3:14 am

Checked the new rom, the one-byte change makes sense, so it has been added.

Thanks for letting us know. :)

bazzano
Posts: 2
Joined: Wed Nov 28, 2018 1:23 pm

Re: Wrong rom dump

Thu Nov 29, 2018 12:03 pm

Thank you very much.
No, I'm not Roberto Lavarone, he wrote the source but he's another person. :-)

And now a little bit of history... :)

When I manually dumped that eprom 40 years ago I wrote it on a piece of paper, then the original 2708 eprom was broken.
After many years I recreated the eprom starting from the written paper, but thanks to my bad writing skills :) I misread a "CD" and programmed a "C0" in the file (look at the following image: it's the last "CD 78 80").

I never noticed that bug because it's very hard to happen: infact that is part of the error checking routine related to writing to cassette tape, but it can't almost never happen because it could be fired only in case of a hardware communication error between the CPU and the UART, and that's almost impossible.

Now I found a original listing of that eprom, so I noticed the bug. It's never too late... :D

Thank you.

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