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Does anyone have a copy of MacsBug 5.1? I'm trying to debug an application on the Macintosh 512K, and I would like the latest version that ran on that machine. "MacsBug Debugger for Macintosh. Copyright Apple Computer 1982-1986. Originally by Motorola. Adapted to Lisa/Mac by Rich Page...

Sometimes I pay too much for a machine just to solve some mysteries. Recently, a Macintosh II with a hard drive labeled A/UX came up for auction. The seller did not show photographs underneath the tray, so I was taking a chance on the motherboard being undamaged and having its socketed chips...

I recently ran into a silent bug that I wanted to alert others to. In my case, the code is looking for a destination drive and wants to skip remote volumes. The little dashes on the far left side of the above image indicate where you can set a breakpoint in the debugger. Hey! Why can't I set...

Hello everyone, Does anyone know how to detect if an application is running in SheepShaver, Basilisk II, or Mini vMac? I'm writing a serial transfer utility and thought it would be nice to synchronize the real Macintosh's clock when it is connected to an emulated Mac. For Basilisk II, I notice...

Here are some leftovers from various IIfx adventures. Macintosh II, IIx, and IIfx Screws These three computers share the same size fasteners for the securing the drive tray itself, the hard drive tray, and the floppy drive trays. Two more screws also hold the motherboard. I find a lot of these...

While restoring a Macintosh II, I ran into some interesting things. MMU Cover Up This 68851 MMU was originally certified and labeled as 12 MHz. Yet, someone has covered the speed with a little black spot. The proper certified speed in the Macintosh II should be 16 MHz or better. So, was this a...

Yesterday, I posted about some "for parts" Macintosh II/IIx motherboards I recently repaired. https://68kmla.org/bb/index.php?threads/spare-parts-mac-ii-and-iix-successful-restorations.46628/ There was one last repair that I hadn't discussed, as I was waiting for a miniature end mill bit to...

For some weird reason, I keep buying Macintosh II series boards and computers. Recently, I purchased a sealed AppleService NOS IIx motherboard. I also purchased another lot that consisted of a Macintosh II upgraded to a IIx with the Macintosh II board separate. Upgraded Macintosh II The seller...

I obtained a SuperMac SuperView that someone sold thinking it was a hard drive. The reason the seller thought this was a hard drive is because this video card is in a standalone case and connected via SCSI. So, it kinda looks like an external hard drive. Conveniently, it features three video...

BlockMove is a Macintosh operating system function that copies memory from one location to another. It performs the same functionality as the C library memcpy function. It is commonly used to copy one structure to another. But, it can also shift one chunk of memory up or down (such as when...

Recently, on eBay, I bought a Macintosh IIfx motherboard that was advertised as 'for parts'. Maybe you saw it and wisely passed it over. The seller included lots of pictures of the damage and was honest about the condition. It was a little pricey for a unique fixer-upper at $100. But, it was a...

I recently purchased a stealth Macintosh IIfx revision B. That is, one of the original owners had a Macintosh II that they upgraded the motherboard to a IIfx. The board looked clean and there wasn't any battery damage. I figured this would start right up after recapping. But, it ended up...

I've recently recapped three PowerBook 100 computers, along with adding some upgrades. Nothing earth-shattering to report. Here are the things I documented. I replaced the LCD electrolytic capacitors with tantalum capacitors. I didn't want to use aluminum electrolytic capacitors again, due to...

I know what I'm going to do this winter if I get snowed in and lose internet access. I just received a box of ~750 floppy disks circa 1984-1987. A couple of Apple tour disks. Looks like the IIcx one hasn't been uploaded yet. Below, Silver Surfer is the 4D database before Apple cancelled...

As shipped, the Macintosh II is deceptively on the challenging side of the Macintosh technology curve: It... 1. Had multiple ROM revisions but doesn't include a ROM SIMM slot (like the IIx) to swap in a modern replacement 2. Didn't support 1440K drives 3. Didn't recognize memory SIMMs bigger...

Circa 1996, a Japanese company called ADTX produced a SCSI to IDE adapter for 2.5 inch IDE hard drives to work in SCSI Macintosh PowerBook computers. Recently, I purchased one on eBay and got another inside a parts machine PowerBook 165c. Both adapters are labeled part number A360025. I assume...

System 6.0.8L is a limited release from Apple that was primarily intended for the Classic II and PowerBook 100, but also supported the Classic, LC, and LC II. The "L" stands for "limited". I'm working on restoring a PowerBook 100. While I waited for parts to arrive, I wondered whether the...

In the book, Macworld Mac Secrets, pages 482-483, David Pogue claims about the Quadra 800: "Interestingly, this model can't produce 24-bit color (the "millions of colors" setting) on any monitor, no matter how much VRAM or what video card you buy for it -- Apple deliberately crippled this...

I recently obtained a non-working SE with a compact-Mac accelerator, the Novy Systems ImagePro 50. It features a full 68030 (has PMMU), a 68882 FPU, 4x4MB 60ns RAM, and 256KB of video RAM. The DE9 + DB15 bracket is included. The board runs at 50 MHz. Below is the board and the jumpers in the...

Read this story to discover lies, bugs, and 68K variations. I ran across an interesting note in Inside Macintosh Memory about the performance of NewPtrClear. It is unusual that documentation would use the word "Currently" instead of "As of System 7.1". Additionally, it is unusual that is says...