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The Lost 256 KB Japanese ROM for the MacIntosh Plus Has Been Found


Mainboard with the two 128 kB EPROMs containing the special MacIntosh Plus ROM image. (Credit: Pierre Dandumont)
The two 128 kB EPROMs containing the special MacIntosh Plus ROM image. (Credit: Pierre Dandumont)The two 128 kB EPROMs containing the special MacIntosh Plus ROM image. (Credit: Pierre Dandumont)
The Apple MacIntosh Plus was one of the most long-lived Apple computers and saw three revisions of its 128 kB-sized ROMs during its life time, at least officially. There’s a fourth ROM, sized 256 kB, that merges the Western ROMs with Japanese fonts. This would save a user of a Western MacIntosh Plus precious start-up time & RAM when starting software using these fonts. Unfortunately, this mythical ROM existed mostly as a kind of myth, until [Pierre Dandumont] uncovered one (machine-translated, French original).

Since this particular ROM was rumored to exist somewhere in the Japanese market, [Pierre] went hunting for Japanese MacIntosh Plus mainboards, hoping to find a board with this ROM. After finally getting lucky, the next task was to dump the two 128 kB EPROMs. An interesting sidenote here is that the MacIntosh Plus’ two ROM sockets use the typical programming voltage pin (Vpp) as an extra address line, enabling 256 kB of capacity across the two sockets.

This detail probably is why this special ROM wasn’t verified before, as people tried to dump them without using that extra address line, i.e. as a typical 27C512 64 kB EPROM instead of this proprietary pinout, which would have resulted in the same 64 kB dump as from a standard ROM. Thanks to [Doc TB]’s help and his UCA device it was possible to dump the whole image, with the images available for download.

Using this ROM image was the next interesting part, as [Pierre] initially didn’t have a system to test it with, and emulators assume the 128 kB ROM format. Fortunately these are all problems that can be solved, allowing the ROM images to be validated on real hardware as well as a modified MAME build. We were informed by [Pierre] that MAME releases will soon be getting support for this ROM as well.

Top image: Mainboard with the two 128 kB EPROMs containing the special MacIntosh Plus ROM image. (Credit: Pierre Dandumont)


hackaday.com/2025/05/17/the-lo…




theintercept.com/2025/05/12/tr…

The House bill to cut taxes on the rich includes a rider that would allow arbitrary removal of any organization's tax exemption. I hope the Democrats have the courage to filibuster the whole thing.

in reply to Richard Stallman

or just wait four years and make a point.

Pull status from all right wing groups.

Obviously this is a terrible idea, but I do sometimes wonder if folks need a taste of their own medicine to understand why people are rejecting it.





In 20 minutes, a #Vine's world premiere #Elgar with Haverorn and Vaughan Williams with Fagan from #Sydney worldconcerthall.com/en/schedu… #wch


ISW gives a good overview of Russia's stance with regard to Ukraine.
understandingwar.org/backgroun…
#russia #ukraine #isw #geopolitics #usa #trump #eu @geopolitics





Aren't we all a little obsessed with mushrooms at the moment?
#mushrooms #mushtodon

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What was it that finally convinced them? Their children telling them they are monsters every morning?

skwawkbox.org/2025/05/15/rhode… #USPol #Palestine #Genocide



in reply to Sky.Bit

The image displays a digital music player interface for the "Super Mario Odyssey Original Soundtrack" by Nintendo, released in 2018. The background is dark, with a red album cover featuring Mario's face and a red hat at the top. The title "Super Mario Odyssey Original Soundtrack" is prominently displayed in white text, with "Nintendo" in red below it. The release year "2018" is shown in smaller white text, followed by a five-star rating. Below the title, there are two red buttons labeled "Play" and "Shuffle." The track list includes "Jump Up, Super Star!" by The Super Mario Players featuring Kate Davis, and "Jump Up, Super Star! Japanese Version" by The Super Mario Players featuring Aimi Mukohara. The track list is displayed in white text with red stars next to the track titles.

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Trump has been enriching himself at an unprecedented scale since day one of his second term—actually, since just before, given that he announced the $Trump meme coin a few days before swearing to protect and defend the Constitution. trib.al/RCSlXSp



Ancient Chinese star chart dated to 2,300 years ago may be the oldest ever, challenging astronomy history | Archaeology News Online Magazine

archaeologymag.com/2025/05/chi…

#archaeology #ancienthistory #history #science #astronomy #china #starchart

in reply to readbeanicecream

Let’s add a few thousand more years with the en.m.wikipedia.org/wiki/Nebra_…

The race to discover that we were already intelligent long ago will never end, because we have three million years of human evolution beneath our feet to uncover.

upload.wikimedia.org/wikipedia…



in reply to CatSalad🐈🥗 (D.Burch)

That cat is playing it way too cool. It needs to go in the scanner to search for hidden catnip.

What was its alley of origin and who's paying its ticket?

in reply to CatSalad🐈🥗 (D.Burch)

Heyo maybe americans could finally get the medical scans they need by simply buying a plane ticket.

It would be a lot cheaper…



C’è un po’ di Svizzera nella vittoria di JJ
“Wasted Love”, canzone vincitrice di Eurovision, è coprodotta da Pele Loriano, autore musicale e direttore artistico di questa edizione basilese
rsi.ch/s/2837123


Sorry, long day, repost. Short story short, check your oil (and teach your kids how to check their oil), rather than wondering if the oil you notice under your car is actually an oil leak. #automobiles





Kim Jong-un held a live-fire drill of air units and called on the army to be ready for war en.news-front.su/2025/05/17/ki…


Attorney General Bonta Secures Preliminary Injunction in Trump Administration Lawsuit over Unlawful Termination of $11 Billion in Critical Public Heal... oag.ca.gov/news/press-releases…


When possible the proletariat should convert property to use for the people... but, occasionally, something may be so steeped in evil, so marked by pain, it may need removed before we can go forward together.

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Miss Daisy and Amos keeping an eye on the outdoor cats

#Caturday




A tall ship of the Mexican Navy has struck the Brooklyn Bridge. abc7ny.com/post/ship-strikes-b…

Trendy Toots reshared this.

in reply to Matt Blaze

@mattblaze Channel 4 in NYC just reported that from what they've heard, it was an error by the capitan. We'll see.
in reply to Steve Bellovin

@SteveBellovin Current reporting is that the ship had a harbor pilot (who would be a local ship captain familiar with the waters) and that there was some sort of mechanical failure; the ship wasn't supposed to go under the bridge at all.


#gazetadobrasil #jornalismo #noticias #politics Justiça Nega Pedido de Redução de Pena de Robinho por Curso na Prisão gazetabrasil.com.br/esportes/2…


Zen Flute Is A Teensy Powered Mouth Theramin


An intriguing mouth-played instrument emerged—and won—at the 2023 Guthman Musical Instrument Contest hosted by Georgia Tech. [Keith Baxter] took notice and reproduced the idea for others to explore. The result is the Zen Flute Mouth Theremin, a hybrid of acoustics, electronics, and expressive performance.

At its core lies a forced Helmholtz resonator, a feedback system built with a simple microphone and speaker setup. The resonator itself? The user’s mouth. The resulting pitch, shaped by subtle jaw and tongue movements, is detected and used to drive a MIDI controller feeding an external synthesizer.



Enjoy various scenes around Arashiyama, the area of Kyōto with the most nature and traditional Japanese architecture: 1) The legendary Moon-Crossing Bridge (渡月橋), 2) Yaezakura (八重桜), a late-blossoming type of sakura with many petals, 3) Traditional architecture deep in a mountain canyon, and 4) The little-known lookout over the river and gorgeous gorge.

#Japan #Kyoto #Arashiyama #nature #architecture #sakura #travel #sightseeing #photos #photography

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The unique Buddhist temple Otagi Nembutsuji (愛宕念仏寺) deep in a canyon in northwest Arashiyama in Kyōto has had a long and complicated history, but its distinctiveness today stems from the 20th Century when a head priest commissioned the carving of over a thousand stone rakan (羅漢, based on arhats, adept disciples of the Buddha). Each statue is unique, unlike the stereotype of Asians, and some are really funny. The moss in this shady side of the mountain also adds to their character, sometimes like hair.

#Japan #Kyoto #sculpture #travel #sightseeing #unique #Buddhism #funny #humor #photos #photography



BBC Earth on Facebook

One of nature’s greatest challenges ❤️

In the animal kingdom, motherhood demands everything, from teaching their young survival skills to nurturing and protecting them!

#EarthCapture by 📸
1. Jack Swynnerton
2. Jack Swynnerton
3. Dafna Ben Nun
4. Jack Swynnerton

#Wildlife #Animals #Photography



BBC Earth on Facebook

One of nature’s greatest challenges ❤️

In the animal kingdom, motherhood demands everything, from teaching their young survival skills to nurturing and protecting them!

#EarthCapture by 📸
1. Jack Swynnerton
2. Suju Gasim
3. Jack Swynnerton
4. Suju Gasim

#Wildlife #Animals #Photography



Short on spare time this week, but inspiration lurked on the windowsill for #52frames #water. I'm leaning towards the front-lit version, I like how I nailed the focus on the droplet and it falls off either side. But the back-lit version is fun too, showing the veins inside the leaf! #nikon #d200 #photography #darktable