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This site is named after Professor Baltazar, the main character of a cartoon I used to watch when I was a kid. He was a clever and practical inventor who always helped his fellow citizens with imaginative solutions to their weird problems.
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Designing a Scientific Calculator from scratch in FPGA
This is a scientific BCD calculator that uses binary-coded decimals, the same internal number format HP used in its scientific…
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A Calculator (10): It Works!
This has been a long journey. What We Built The earlier posts covered each layer in depth: the CPU, the arithmetic, the scripting interpreter, the hardware. Here is what the final Quartus synthesis report says about all of them together: The complete desi
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A Calculator (9): Chasing the Last Digit
The calculator described in the previous posts worked. The 2021 implementation ran on real hardware, accepted key presses, computed results, and displayed them. The arithmetic was correct in the sense that most results were right to around 12 significant
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A Calculator (8): From Dev Board to a Real Device
In the previous post, I wrote about the microcode and the scripting layer. At that point, the calculator existed mainly in software: as a Qt desktop application running a verilated simulation, or as a WebAssembly page in a browser. That is a pleasant envi
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A Calculator (7): Writing Microcode for a CPU You Just Invented
In the previous post, we designed the CPU. We settled on the instruction set, wrote the assembler, verified each opcode, and ended up with a clean, working processor running in silicon (or rather, in an Altera Cyclone II EP2C5T144C8 FPGA, which is close e
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