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

Wrong rom dump

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
Robert
Posts: 99
Joined: Thu Nov 06, 2014 12:44 pm

Re: Wrong rom dump

(deleted)
Last edited by Robert on Fri Sep 23, 2022 2:52 am, edited 1 time in total.
bazzano
Posts: 2
Joined: Wed Nov 28, 2018 1:23 pm

Re: Wrong rom dump

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.

http://www.z80ne.com/temp/ep382.jpg

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