• Updated 2023-07-12: Hello, Guest! Welcome back, and be sure to check out this follow-up post about our outage a week or so ago.

Recent content by al kossow

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    SE/30 pal dumps

    A while ago, I found an SE/30 with unprotected PALs Here are the dumps from them http://bitsavers.org/pdf/apple/mac/se30
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    Early LaserWriter ROM dumps

    for the LW Plus completeists, there is an upgrade rom set on ebay that hasn't been dumped but I don't feel like spending $100 for it. it looks like one with just higher density roms https://www.ebay.com/itm/275994554509
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    Early LaserWriter ROM dumps

    It is possible to dump them. I've had an original LaserJet PCB for a while now that I've been meaning to dump. The firmware is much smaller than Apples
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    First pictures of the inside of a Mac Plus HAL

    some progress https://oldbytes.space/@bitsavers/110125010293424011
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    First pictures of the inside of a Mac Plus HAL

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    Powerbook 100 Schematic or Test Point Chart? tldr ;-)

    pb100 schematic http://bitsavers.org/pdf/apple/mac/powerbook/100/PB100_Schem_Jan1991.pdf
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    Reverse Engineering the Macintosh Plus PCB

    http://bitsavers.org/pdf/apple/mac/schematic/050-0159-A_MacPlus.tif scanned from a blueprint I bought off eBay
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    Can anyone identify this (apple?) nubus+pds videocard?

    Dale Adams designed DAFB (Dale Adams Frame Buffer)
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    Lisa Source Release

    https://computerhistory.org/blog/the-lisa-apples-most-influential-failure/ https://computerhistory.org/blog/apple-lisa-still-more-to-uncover/ https://computerhistory.org/events/happy-40th-birthday-lisa/
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    Reproducing the Lisa 2 Card Stack: The CPU Card

    It won't, no matter what a random reporter claimed from quoting me out of context from a message on a private mailing list five years ago. Getting Apple to release the code means we abide by their rules. "I find the phrase 'trade secrets of the computer history museum' unreasonably amusing"...
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    I present to you an EVT TNT Power Macintosh 7500 Prototype Board and More

    I would love to extract whatever information is this little chip. It is a workaround for a bug in the Hammerhead memory controller.
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    Does anyone have a 7500 ROM SIMM and if not are there modern day programable ones?

    Development flash roms existed. You needed a "Flash Gordon" Quadra PDS card to program them. I have a box with dozens of them I'd take an offer for in a private message. It's what we used for ROM development in all the first generation PCI machines
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    get ADB performa keyboard power button to turn on G4 quick silver...

    I think you're going to find it did something gross like short the D+ D- lines when you pushed the button.
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    get ADB performa keyboard power button to turn on G4 quick silver...

    At some point in the G4 life cycle, Apple removed the power on through USB functionality because it violated the USB spec.
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    Why didn't the Original Mac OS have pre-emptive multitasking

    I'm not sure what makes the Lisa's MMU a "crude hardware circuit"; what doesn't it do that would be a necessary part of the basic requirements of a "full memory management unit"? -- Lisa has a base-bounds segmented MMU, like the 68451, The SUN used a two-level segment-page mmu that allowed for...