Dumping character ROM

Jo Even
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Dumping character ROM

Post by Jo Even » Sun Aug 18, 2019 10:46 am

I have an MZ-700 with a Swedish character ROM I want to dump. The ROM is a Mitsubishi M5L2732K, for which my EPROM programming software (MiniPro) does not have a profile for. I have tried to dump it with some other 2732 DIP24 profiles, and while it seems to work the bit-order appears to be reversed when I test it in an emulator.
MZ700 reversed characters.png
MZ700 reversed characters.png (15.83 KiB) Viewed 595 times
This is a DOS emulator called MZ700EMU. Any idea if this is a problem with the dumped ROM or the emulator?
Attachments
MZ700-swe-char-rom.zip
(2.82 KiB) Downloaded 20 times

Jo Even
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Posts: 124
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Re: Dumping character ROM

Post by Jo Even » Sun Aug 18, 2019 11:04 am

Ok, it seems to be an emulator "feature".

https://www.sharpmz.no/articles/the-mz- ... ators-rom/
Some authors have mirrored the bit combination in each column of the characters.

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Pacman
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Re: Dumping character ROM

Post by Pacman » Thu Oct 24, 2019 9:45 am

Hello,

By analyzing Swedish characters, I realized that there were duplicate characters (pink color) and poorly copied characters (in red) compared to Western originals (attached image).
Did I analyze the file incorrectly?
jeu_suede.png
jeu_suede.png (18.69 KiB) Viewed 445 times

hlide
Posts: 313
Joined: Thu Jan 25, 2018 9:31 pm

Re: Dumping character ROM

Post by hlide » Thu Oct 24, 2019 4:00 pm

I'm not sure the Swedish font was an official one and was fully qualified. It is probably a third-party selling MZ-700 with a Swedish keyboard and a monitor rom and a font rom they altered.

hlide
Posts: 313
Joined: Thu Jan 25, 2018 9:31 pm

Re: Dumping character ROM

Post by hlide » Thu Oct 24, 2019 4:04 pm

Jo Even wrote:
Sun Aug 18, 2019 11:04 am
Ok, it seems to be an emulator "feature".

https://www.sharpmz.no/articles/the-mz- ... ators-rom/
Some authors have mirrored the bit combination in each column of the characters.
Are they Japanese? could be a trick to not publish the original font file as such...

S_U_C
Posts: 25
Joined: Sun Feb 17, 2019 6:41 pm

Re: Dumping character ROM

Post by S_U_C » Thu Oct 24, 2019 5:31 pm

Hi this may help
Attachments
Mitsubishi M5L2732K.zip
(157.28 KiB) Downloaded 10 times

UncleBod
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Re: Dumping character ROM

Post by UncleBod » Thu Oct 24, 2019 6:09 pm

The Swedish original font ROM was definitely official in the 700. It was installed by ADDO Sharp, the Swedish distributor. This could, of cause, be a non official ROM anyway. How was it labeled?
/UncleBod
Last edited by UncleBod on Fri Oct 25, 2019 6:23 am, edited 1 time in total.

hlide
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Re: Dumping character ROM

Post by hlide » Thu Oct 24, 2019 6:51 pm


UncleBod
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Re: Dumping character ROM

Post by UncleBod » Fri Oct 25, 2019 6:27 am

I am more interested in the label on the prom. Besides, the MZ-800 were slightly late on the market, and I am not sure if they went through the ADDO Sharp office or any other way.
/UncleBod

Jo Even
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Re: Dumping character ROM

Post by Jo Even » Mon Nov 04, 2019 8:08 pm

Pacman wrote:
Thu Oct 24, 2019 9:45 am
By analyzing Swedish characters, I realized that there were duplicate characters (pink color) and poorly copied characters (in red) compared to Western originals (attached image).
The duplicate characters are there to avoid patching software. Take a look at my Swedish keyboard and you'll see what I mean :)
2019-11-04 21.00.30.jpg
2019-11-04 21.00.30.jpg (168.41 KiB) Viewed 305 times
The downside is of course that programming on this machine is a b*tch.

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