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Scribble Pen Plotter: The Mechanical Parts
Ending the Beginning of a Very, Very Long Project
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Modular Monitor: Serial Terminals, Hardware Bugs, and You
Connecting the 6502 to a Serial Terminal Turned Out to be Harder Than Expected. When I designed my minimal 6502 development board, I made plenty of concessions to keep the project feasible. A lot of my grandiose ideas for it turned out to be impractical, but I’m still using it. Why not? It’s still a…
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6502 Development: NOPerator Debugging Aid
A Very Simple 6502 Accessory That can Catch Very Complex bugs. Debugging is hard. Anyone who programs computers knows how hard it is to get stuff working reliably. Tiny oversights can lead to massive problems, often in ways that aren’t obvious. Patches get churned out on a daily basis. Hardware engineers have it much, much…
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6502 Minimal Development Board
A Minimalist First Step Into Complex 6502 System Design. I’ve had a serious interest in computer hardware since high school. In between attempts to design my own CPU, I also took some interest in the 6502 shortly after finding Veronica. I promptly ordered two R65C02s- and did nothing with them. Keep in mind this was…
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Discrete PS/2 Keyboard Interface
Type Like it’s 1987: a Hardware Driven PS/2 Interface. In 1987 IBM released the PS/2 keyboard, an update of the earlier IBM AT keyboard with a smaller connector, extra features, and support for a mouse using the same connector and protocol. This rapidly became the standard for PC compatibles. You’ll still find PS/2 ports on…