Note that I do not program any ROM images onto these SIMMs they will arrive empty. If you’re interested in buying pre-assembled SIMMs and/or programmers, you can buy them from me below. Since the project is open source you are free to build your own for non-commercial use, but I keep SIMMs and programmers built up here and ready for purchase if you don’t feel like buying PCBs and assembling them yourself. The 8 MB SIMM does not have these lights.
The 2 MB SIMM has a pair of red LEDs (light-emitting diodes) on the back so it lights up the inside of your case. The software is available for download at my Google Code project. You can also make it work in Linux if you feel like compiling the software for yourself. It is compatible with Windows XP and higher or Mac OS X 10.5 or higher. The programmer has a slot for a SIMM and connects to your computer through a USB port. Both the 2 MB and 8 MB SIMMs use flash memory that can be reprogrammed 100,000 times or more. The 8 MB version uses fine-pitch chips soldered directly to the SIMM, so you have to use the SIMM programmer to program them. The 2 MB version has four socketed PLCC chips which can be individually programmed with a flash chip burner, or you can use my custom designed SIMM programmer to easily program all four chips directly without needing to pull them out of their sockets.
There are both 2 MB and 8 MB programmable SIMMs available. The combination is pretty nifty and enables people to do all kinds of crazy things that previously weren’t possible, such as Rob Braun’s bootable ROM disk driver or changing the startup chime. Everything from the hardware design to the firmware is completely open source. I have developed programmable ROM SIMMs for older Macintosh computers along with a programmer for flashing a ROM image to the SIMMs.
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