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Miguel Arroz

@arroz.mastodon.social.ap.brid.gy

71 followers 8 following 2K posts

Indie Mac developer. Former Apple and survs.com. I program my home computer, beam myself into the future. Living in 🇵🇹, missing 🇨🇦 a bit. 🌉 bridged from ⁂ mastodon.social/@arroz, follow @ap.brid.gy to interact

Posts Replies Media

Miguel Arroz @arroz.mastodon.social.ap.brid.gy · 14h

The good news about the LC is, with a new ROM replacing the broken one (UD2) (thank you so much @luisfcorreia!) plays the chime, shows video, ADB works, even kicks out a bad floppy! The bad news is SCSI is not working. I’m betting it’s related to the 3.6V […] [Original post on mastodon.social]

Miguel Arroz @arroz.mastodon.social.ap.brid.gy · 22/10/2026

Another great achievement of Xcode 27: yesterday me and my coworker had our Macs side by side showing the same file on the same branch, with the authors view on. My Mac was showing one author for a bunch of lines. His Mac showed a different author (coincidentally, me). Keep vibing.

Miguel Arroz @arroz.mastodon.social.ap.brid.gy · 22/10/2026

One thing I always hated was Apple having the intelligence and courage to do things differently, and then some sheep-follower person with too much influence asking “shouldn’t we do this like everybody else?”. No. No you absolutely shouldn’t. If you want to do the things like the rest of the […]

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Original post on mastodon.social

Miguel Arroz @arroz.mastodon.social.ap.brid.gy · 22/10/2026

And btw Xcode used to handle themes beautifully. The UI and text editors were independent. You could have a light interface and a dark editor. That was perfect. I could still see the UI on a lit room, but the text would not hurt my eyes. It was the only IDE that fid this right. Now, it’s […]

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Original post on mastodon.social

Miguel Arroz @arroz.mastodon.social.ap.brid.gy · 22/10/2026

Xcode 27 is so broken that not even the back/forward stack works right. But “keep vibing”.

Miguel Arroz @arroz.mastodon.social.ap.brid.gy · 21/10/2026

@brenttoderian.bsky.social The only time I saw that happening was with PPC. I assume they also knocked and wanted to talk but I was not at home (it would have been as “interesting” conversation…). I assumed that was allowed, since it’s political campaign. Is it not? Maybe it only happened […]

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Original post on mastodon.social

Miguel Arroz @arroz.mastodon.social.ap.brid.gy · 20/10/2026

Interesting, the number or bad bytes is surprisingly small. Although it changes occasionally, reads keep switching between two or three different dumps. #retroApple

Miguel Arroz @arroz.mastodon.social.ap.brid.gy · 20/10/2026

Ok, now it makes sense! And the bad chip seems bad in just some areas, not all over the place. I guess some address bit is bad. Sadly, the badness starts right at word zero, so the Mac can’t boot. #retroApple

Miguel Arroz @arroz.mastodon.social.ap.brid.gy · 20/10/2026

Ahhh, a hardware bug! 🤦‍♂️ Red and brown are swapped. #retroApple

Miguel Arroz @arroz.mastodon.social.ap.brid.gy · 20/10/2026

This is even weirder than it seems. After the first 60 bytes, the ROMs diverge. But they are supposed to be the same ROM, says so on the ROM itself. I wonder if I swapped some address bits… #retroApple

Miguel Arroz @arroz.mastodon.social.ap.brid.gy · 20/10/2026

All right, got it! It’s 512KB only, 4 chips with 128KB. I was reading a mirror on the second 128KB of each chip (that does not exist). I need to compare the contents further but on a quick look the 3rd chip is totally broken. Each word has byte 1, 2 and 4 similar to expected but 3 is totally […]

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Original post on mastodon.social

Miguel Arroz @arroz.mastodon.social.ap.brid.gy · 20/10/2026

Does anyone know how large the Mac LC ROM is supposed to be?! I see 512KB and 1MB files. So, I definitely have a bad UD2 chip: that one keeps flipping byte 5 and 6. The other 3 always read the same. Problem is… all the 1MB ROMs I got are different that mine. Very different. #retroApple

Miguel Arroz @arroz.mastodon.social.ap.brid.gy · 18/10/2026

@luisfcorreia I’ll test them and let you know. They use four chips for some reason so i need to understand how did they split the bytes between them but it shouldn’t be a problem.

Miguel Arroz @arroz.mastodon.social.ap.brid.gy · 18/10/2026

Next thing I will try when I come back to this: rebuild my Arduino rig and test the ROMs. Might just be that the entire computer is working, but it doesn’t know what to do due to one of the ROM chips being dead. Hopefully it’s not some dead, irreplaceable component like the glue chip. 🤞 #RetroApple

Miguel Arroz @arroz.mastodon.social.ap.brid.gy · 18/10/2026

To conclude today… symptoms (using a known to be good PSU): - Powers on, speakers/headphones do the usual “sound chip power up” clonk, but no chimes (good or bad); - Video chip is generating a signal (the monitor wakes up) but it’s all black. - Reset works, doing the reset combination makes the […]

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Original post on mastodon.social

Miguel Arroz @arroz.mastodon.social.ap.brid.gy · 18/10/2026

I guess so. The 475 looks similar. So that works. #RetroApple

Miguel Arroz @arroz.mastodon.social.ap.brid.gy · 18/10/2026

Is this how the clock signal is supposed to look like on the Mac LC? 🤔 #RetroApple

Miguel Arroz @arroz.mastodon.social.ap.brid.gy · 18/10/2026

Well, the LC does not work, lol. Weekend of failure. Another challenge!

Miguel Arroz @arroz.mastodon.social.ap.brid.gy · 18/10/2026

Can anyone with a Mac LC confirm (in the real thing, not schematic) the negative side of C4 is directly wired to the PSU ground pins? #RetroApple

Miguel Arroz @arroz.mastodon.social.ap.brid.gy · 18/10/2026

I love waking up to good news! Vancouver elected Pete Fry (Green Party) as its new mayor, and kicked out the incumbent Ken Sim. Good! Fry would not be my first choice but he’s orders of magnitude better. Fuck Ken Sim! Looks like a lot of One City councillors also got elected which is great! I […]

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Miguel Arroz @arroz.mastodon.social.ap.brid.gy · 17/10/2026

This feeling never gets old. This is why putting the time to learn and understand how things work is important. Don’t ask the machine to solve a problem for you. Use all the ways you can to understand it yourself. Ask people who know more than you. Look up info. Think. Ask stupid questions. Get […]

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Original post on mastodon.social

Miguel Arroz @arroz.mastodon.social.ap.brid.gy · 17/10/2026

Mac isn’t working yet, but man I love learning. I started the way without understanding nothing of the schematic beyond the basic rectification and big cap smoothing. After studying this stuff for some hours and discussing it with my father (retired electronics engineer) I now understand a good […]

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Miguel Arroz @arroz.mastodon.social.ap.brid.gy · 17/10/2026

Does anyone have the schematic for the Mac Classic analog board 630-0420? It seems somewhat similar to Bormac’s 820-0398-A / 630-0398-2, but I think that schematic has at least one error (missing RP1, which is quite important). If you have more test points than the Bormac in the PSU area, I […]

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Original post on mastodon.social

Miguel Arroz @arroz.mastodon.social.ap.brid.gy · 17/10/2026

@luisfcorreia Unknown but unlikely. The board was coveted in cap juice with caps clearly bad. I didn’t power it on and the owner says he hasn’t tried for many years.

Miguel Arroz @arroz.mastodon.social.ap.brid.gy · 17/10/2026

@luisfcorreia Just did. Still dead. Might be this TDA chip.

Miguel Arroz @arroz.mastodon.social.ap.brid.gy · 17/10/2026

@luisfcorreia I doubt it. It doesn’t even click or try to do anything. I can try the logic board just to make sure. I do have the correct voltage (306V DC) across both big ass filtering caps though, so that part at least works. The high frequency part, that goes into the transformer, not sure yet.

Miguel Arroz @arroz.mastodon.social.ap.brid.gy · 17/10/2026

Well… nothing. At all. One rail goes up a few mV and that’s it. Sad trombone. At least no explosions. #RetroApple

Miguel Arroz @arroz.mastodon.social.ap.brid.gy · 17/10/2026

Ready to test the recapped board, for now with a sacrificial HD and voltmeters on all rails. This is it, folks! #RetroApple

Miguel Arroz @arroz.mastodon.social.ap.brid.gy · 16/10/2026

Pulled out a bunch of caps from the Classic analog board and for the first time I can confirm it really smells like rotten fish. Yuck. And my fingers are covered in it. #RetroApple

Miguel Arroz @arroz.mastodon.social.ap.brid.gy · 16/10/2026

All real companies out there, but not ironically. Also, this site is gold! alignmentalignment.ai/caaac

Miguel Arroz @arroz.mastodon.social.ap.brid.gy · 15/10/2026

Makes me miss Eclipse.

Miguel Arroz @arroz.mastodon.social.ap.brid.gy · 15/10/2026

I (and well, everyone else) criticizes Xcode flaws but bloody hell I seriously don’t understand people who use Visual Studio Code willingly as their first choice. This is likely the worst IDE I have ever seen. I want to throw the Mac out the window.

Miguel Arroz @arroz.mastodon.social.ap.brid.gy · 12/10/2026

Remember when thinking something taking a whole lot of work and a bunch of people to get done was looked at as a good thing?

Miguel Arroz @arroz.mastodon.social.ap.brid.gy · 12/10/2026

Really sad to see Apple pushing so many good people out. It’s hard to believe there were no good positions for these folks in different teams. The new CEO is definitely not starting well. You don’t treat your best people like a disposable resource.

Miguel Arroz @arroz.mastodon.social.ap.brid.gy · 12/10/2026

Elon Musk actively supports far-right parties, including participating via video link in the AfD campaign launch. Any post or interaction in X, especially from a popular account, directly generates revenue to X from advertising and paid subscriptions. These are not opinions. These are facts […]

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Original post on mastodon.social

Miguel Arroz @arroz.mastodon.social.ap.brid.gy · 11/10/2026

Vacations are over. Back to work tomorrow. 😭

Miguel Arroz @arroz.mastodon.social.ap.brid.gy · 09/10/2026

@seanorr.bsky.social Ohhh interesting! Fry would not be my first choice, but hell yeah, I hope he’s the next Mayor given the only other possible option is Ken Sim. I wish I still lived there so I could help voting him out.

Miguel Arroz @arroz.mastodon.social.ap.brid.gy · 07/10/2026

I’m in a place with a lot of herons, day and night!

Miguel Arroz @arroz.mastodon.social.ap.brid.gy · 06/10/2026

Sweet! I spent a good part of the morning aligning the zero track sensor of the Classic floppy disk drive. 0/10, absolutely do not recommend. But it can now format and verify disks! 😁

Miguel Arroz @arroz.mastodon.social.ap.brid.gy · 05/10/2026

(Well, technically I could save the scroll operation in the off G world scenario by copying the right part of the frame to the new coordinates. But the worst part is really integrating all that in the PowerPlant architecture. Maybe in a few days.) #retroApple #retroCoding

Miguel Arroz @arroz.mastodon.social.ap.brid.gy · 05/10/2026

There’s a nasty trick there, in the pre-appearance manager version, I don’t actually scroll the two horizontal lines that separate header from content. Otherwise there would be a short moment where the scrolled edge would not have the lines and it would look ugly. The lines remaining stable […]

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Original post on mastodon.social

Miguel Arroz @arroz.mastodon.social.ap.brid.gy · 05/10/2026

I am extremely happy with the performance of my table view! This is an LC 475, original non-overclocked CPU (60LC040 @ 25Mhz)! Unfortunately I still could not manage a complete offscreen scrolling, because I would have to create an offscreen GWorld, copy the […] [Original post on mastodon.social]

Miguel Arroz @arroz.mastodon.social.ap.brid.gy · 05/10/2026

@Ardvaark It took me a while to get that. 😅 Damn, I miss it.

Miguel Arroz @arroz.mastodon.social.ap.brid.gy · 05/10/2026

The carnival 🎡 is in town which means it’s the third night I have obscene amounts of questionable food for dinner. I may not survive the week.

Miguel Arroz @arroz.mastodon.social.ap.brid.gy · 05/10/2026

Same exact PowerPlant class, running on Mac OS 9.2.1 and System 7.1 😁 #retroApple #retroCoding

Miguel Arroz @arroz.mastodon.social.ap.brid.gy · 04/10/2026

@kangaroo5383 Of course it’s not all great. Their government is oppressive. But what about the western world? Our duality regarding Russia and Israel? The fact the US historically supported the extremely oppressive regime in Taiwan, the Franco regime in Spain, has ok with the fascist regime in […]

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Miguel Arroz @arroz.mastodon.social.ap.brid.gy · 04/10/2026

@kangaroo5383 China does some things really well. The way they handled Covid. Their high speed trains and mobility strategies. Their industrial strategies including clustering different companies that depend on each other in the same place and betting not in the final products but the raw […]

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Miguel Arroz @arroz.mastodon.social.ap.brid.gy · 04/10/2026

@kangaroo5383 China is only a "threat" because it's building better and cheaper tech products than the US. Look at data networks. I have a Huawei ISP-provided router at home. Their network probably runs on chinese branded HW. Look at cars. Most people who are buying EVs here buy chinese (BYD and […]

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Miguel Arroz @arroz.mastodon.social.ap.brid.gy · 04/10/2026

@kangaroo5383 Same in Canada. Tha fabricated propaganda against China was ludicrous. I kept telling my friends there "China wants to sell you stuff, the US needs to keep their military-industrial complex going and are a violent, aggressive, imperialist state, the most dangerous country on earth […]

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Miguel Arroz @arroz.mastodon.social.ap.brid.gy · 03/10/2026

This is how it looks if I read the smoothed analog channel connected to the Mac Classic’s PWM output continuously. No idea why yet. In the previous video I was reading every 15ms. It looks better but if you look closely you can still see the occasional black line or artifact going by. #retroApple