Sad Mac
I’m working with my Xilinx Spartan 3A FPGA board for the moment, and I’ve finally made some visible progress. I’ve never been so happy to see a Sad Mac! A boot failure may not seem very exciting, but I’m thrilled that…
Steve
Hardware Simplification
Today I’ve been thinking about ways to simplify the Plus Too hardware. Anything I can do to reduce the part count will make the final board easier to build, and also help with the the inevitable debugging work. The nice…
Understanding Verilog Warnings
Those of you who’ve followed the blog for a while know about my many frustrations with Verilog. Because it feels sort of a like a procedural programming language, but very definitely isn’t one, I keep expecting to be far more…
Emulation, or Replication?
Is there any essential difference between an emulator and a hardware clone? What should it mean to “clone” a computer system? These questions have been on my mind a lot recently, as I work on my Mac Plus clone, somewhat…
Frame Buffer Test
I’ve made some progress on Plus Too, but don’t get overly excited by the photo until you understand what it’s doing. I’ve finished the Verilog implementation of the video timing and pixel shifting modules, as well as some portions of…
An SD-card Floppy Emulator for Classic Compact Macs
While working on the “Plus Too” Mac Plus clone, I’ve started thinking further about a semi-related side project: a floppy drive emulator that works with actual classic compact Mac hardware (the Mac 128K, 512K/e, and Plus). These machines all have…
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