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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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Simple Power: A Minimalist Adjustable Power Supply
A Simple Power Supply for When you Don’t Need all the Bells and Whistles. Having a bench supply? That’s great. Moving it around? Well, it’s called a bench supply for a reason. There’s definitely a niche for a small power supply you can carry from place to place. I’m not pushing the boat out too…
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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…
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20V 2A Linear Bench Power Supply
A classic project with ample utility.
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Simple Load: A Low-cost, Medium Power Test Load
Building a Constant Current Load for Power Supply Testing. Usually when we talk about “power” we refer to a power source, e.g. “battery power”, “mains power”, etc. Sometimes though, its more useful to refer to what’s using the power: the load. Having a controllable load is particularly useful when designing a power source. You can,…