![]() These are the same as the addresses within the ROM code. What’s all this? Running down the left side are the file offsets in hex. If we open the ROM-inator II file in xvi32, we’ll see this: Check out Synalyze It and Hex Fiend for some other examples. I’ll be using a Windows hex editor called xvi32, but there are many other options for Windows, Mac, and Linux. To modify or patch the file, we’ll need a tool called a hex editor. Only the first 512K of the file is ROM code, and the rest is data for the ROM disk. The latest ROM-inator II contents are available on the product’s web page, and at the time of writing it’s this file. The ROM-inator II’s contents are also based on the IIsi ROM, with many modifications and additions. The original IIsi ROM is just a 512K chunk of raw data, which you can find here. It’s a universal ROM, meaning that even though it was designed for the IIsi, it also works in many other Mac models. This is an advanced tutorial for major gear-heads, so hang on to your hat! But why stop there? For the truly adventurous, this tutorial will demonstrate how to patch the ROM code to alter the machine’s low-level behaviors. ![]() With the optional ROM SIMM Programmer, you can edit the ROM’s contents, altering the ROM disk or writing a different stock ROM image. The ROM-inator II replacement flash ROM for the Mac II series and SE/30 comes pre-programmed with nifty new features for your vintage Macintosh. ianpolpo on First Look at the RP2040 – Raspberry Pi Microcontroller.Gorf on First Look at the RP2040 – Raspberry Pi Microcontroller.olePigeon on New Product: Apple Disk Drive A/B Switch.Steve on New Product: Apple Disk Drive A/B Switch.Yellowstone Universal Disk Controller for Apple II ![]() Floppy Emu Disk Emulator for vintage Apple II, Macintosh, and Lisa
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