croissantking

croissantking

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  • croissantking
    My SE/30 sometimes makes this Sad Mac tone (in this case due to a poorly seated SIMM) – it's not often heard and the first half sounds a bit like a Game Boy. I wonder what it means and what fault causes it to play that specific tone.

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    Bolle
    Bolle
    I've heard that before but couldn't find a failsafe way to reproduce it. But it does indeed seem to be RAM related...
    D
    dougg3
    I have a quick video that shows off the four different death chime variations on my IIci:


    Sounds like yours is Error4Handler. Unfortunately the leaked SuperMario source code doesn't explain the difference between Error3Handler and Error4Handler, so we'd probably have to disassemble the ROM to figure it out. I agree though, it's almost certainly a RAM test failure.
    croissantking
    IMG_6519.jpeg
    48MB RAM in a 520c
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    Reactions: demik, KGLlewellyn, Callan and 2 others
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    croissantking
    croissantking
    Haha @Snial, you’ve certainly paid attention to the details! Yes, RAM Doubler is enabled. I use this 520c chassis to test everything. The CPU currently in the machine for 48MB testing is 33MHz. I probably tested the 40MHz CPU in here a while back and moved it to a 540c chassis where it now lives. The 33 in the Control Strip *is* the CPU speed, but it only ever shows 25 or 33 and nothing else.
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    Callan
    Callan
    NICE! I guess that second RAS line was found.
    Great job! I'm gonna have to add that to the list of mods I'm doing to mine! Cheers!
    croissantking
    croissantking
    @Callan Yep i found the unused RAS line! Between [0] and [2], incredibly haha.
    croissantking
    IMG_6321.jpeg
    • Wow
    Reactions: zefrenchtoon
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    croissantking
    croissantking
    @robin-fo yes it’s something interesting in the iMac trayloader’s firmware. I got to it purely by accident - I was dumped into OF due to an error and this appeared when I typed Mac-Boot. It almost looks like the beginnings of the boot picker GUI, which of course wasn’t yet implemented on the very first New World Macs.

    @joevt have you seen this before?
    J
    joevt
    Yes, on my B&W G3 and DingusPPC (B&W G3, iMac). That image appears after a boot file has been chosen automatically. It's just showing what is booting (device path, partition number, file path, file type, icon). The icon image is in the CHRP boot script in the data fork of the "Mac OS ROM" file. Search for "multi-boot" and "multi-boot-menu" in this forum for info about the boot picker.
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    Snial
    Snial
    Interesting, I'm going to be at the Everything Electric show in Farnborough in early October, where I hope to pick up a friend's B&W G3. I'll have space, because it can go under a desk. It'll be a cross-over Mac as it can run Mac OS 8.6 through Mac OS X 10.4.
    croissantking
    IMG_5420.jpeg

    Found this photo from 2003. If I had only known about flux 😢
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    Snial
    Snial
    Then that's very encouraging. My experience with soldering at school in the mid-1980s had led me to believe I couldn't solder at all until I forced myself to learn the basics over 2004-2005. Actually it was more like I'd lost confidence again between the mid 1990s and the mid 2000s.
    obsolete
    obsolete
    When I was young and ignorant, I used plumbing flux, because it was all that was available locally. Oh, the corrosion...

    @Snial I didn't think I was any good at soldering either, until I got access to good equipment and materials. Once I was using the good stuff, things I struggled with before became so easy, it felt like cheating. Still does sometimes.
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    Pilgrim33
    Pilgrim33
    Great photo quality for 2003!
    croissantking
    I asked ChatGPT to show me how Mac OS X might have looked if it were designed to run in 24-bit addressing mode.

    IMG_4965.jpeg
    croissantking
    IMG_4689.jpeg

    Successfully moved a 466Mhz 7400 CPU onto a G3 CPU card - harvested from a Digital Audio card that I obtained for peanuts. The cache chips are rated at 250MHz, so I guess this thing will easily do 500MHz.

    The old 750L will go onto an iMac trayloader CPU card.
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    Reactions: cheesestraws, obsolete, Powerbase and 1 other person
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    croissantking
    croissantking
    croissantking
    croissantking
    -Preheat donor PCB, use hot air to remove chip
    -Remove solder balls. Clean pads with braid/IPA
    -Line up stencil, tape to chip. Mask unused holes
    -Smear flux into holes
    -fill holes w/ solder balls
    -Heat chip w/ hot air @300C until balls melt to pads
    -Remove stencil + clean chip
    -Coat new PCB pads w/ flux
    -Line up chip
    -Preheat PCB + use hot air @300C to heat chip, should drop once soldered into place
    croissantking
    croissantking
    This thing’s rock stable at 567MHz!
    croissantking
    Got some OPTi chips for future Personality card mods. The plastic wrap on these Chinese imports always smells of citrus.

    IMG_4559.JPG
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    croissantking
    croissantking
    @zigzagjoe I thought remarking usually is to disguise a lower speed grade as a faster one, or one with fewer features as having more - not relevant for this USB controller?
    If the chips work, and identify as 82c861, then would it matter if they were remarked?
    zigzagjoe
    zigzagjoe
    I'm given to understand it is more often cosmetics. Customers want new looking part not scratched up salvaged parts rather than malicious intent.

    For these I concur if it functions correctly then it's not really a huge concern, just good to know.
    croissantking
    croissantking
    croissantking
    This shutdown dialog under System 7.1 is particular to the 840AV. Normally, nothing happens when you press the power key under 7.1. It’s a customisation built into this machine’s system enabler.

    IMG_4397.jpeg
    Renegade
    Renegade
    it seems to me that many enablers implement this functionality under 7.1
    croissantking
    croissantking
    It is an ugly dialog box for sure! Probably made by an engineer not a designer. Still, interesting to see the progression towards the 7.5+ shutdown box we all know and love
    croissantking
    I’m hoping to save this 040 chip, soldered to one of @zigzagjoe’s QFP2PGA boards. I ground two corners with a Dremel to be able to attach repair wires to the missing pins, which were lost to corrosion. Might give you some ideas for yours @jmacz

    IMG_4343.jpeg
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    Reactions: joshc and cheesestraws
    jmacz
    jmacz
    Nice, haven’t played with the chips yet but will try to save that one with the broken pin.
    Joopmac
    Joopmac
    cool, what about this adapter? is this an accelerator or just adapter? looks sweet.. is there a topic?
    croissantking
    croissantking
    @Joopmac its an adapter that lets you use a quad flat pack 040 in a PGA socket, designed by @zigzagjoe. It’s freely available on his GitHub :)
    croissantking
    My SE/30s are very ill. Stock PSU issues, mostly. They’re recapped, but their +5V rails are too low. I might try tweaking the voltage pot - but +12V is already quite high.
    View previous comments…
    croissantking
    croissantking
    As I recall, anecdotally, they got worse after recapping. The big cap is a slightly different capacitance than the original, I hope that didn’t mess things up.
    robin-fo
    robin-fo
    I didn‘t change the big cap..
    croissantking
    croissantking
    Have you played with the pot yet? I’ve been putting it off as it’s a fiddle to do, but I need to try.
    croissantking
    Anyone know anything about this mystery USB Port '0' on the Yosemite board? (Next to the firewire module)

    IMG_3852.JPG
    View previous comments…
    Daniël
    Daniël
    The Yosemite schematic says J18 should be a test point for the 14MHz clock going to the IMI SG500 clock generator, so the silkscreen for a supposed USB port seems unrelated. There is mention of a removed internal USB port during the prototype phase in the schematic changelog, so it may just be orphaned silkscreening for that.
    croissantking
    croissantking
    That’s interesting!
    C
    cheesestraws
    yeah, agree with @obsolete and @Daniël - that's definitely an RF connector footprint of some description, probably is an SMA but I'm not familiar enough with 'em to be able to tell them by sight so I'll trust @obsolete on this one :-D. No idea what the usb0 silkscreen is doing there.
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