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  • HP Calculators custom chips around 1980

    calendar Mar 18, 2025 · 5 min read
     en lettere-a-mia-figlia  · hp12c nut retro-computing saturn
     ·
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    HP Calculators custom chips around 1980

    HP started designing handhelded calculators from 1968 until the end of ‘80. I buyed an HP-42S around 1993 but it has been designed near 1986.

    Here I want to focus on the chip design of the 10C series, a compact set of calculator with programming abilities but with full numeric display. The HP-15C was introduced in 1982, in the full 8bit computer era, the same year of the C/64. Later model will feature a more mature “Saturn” processor. I will describe here this chip at the best of my abilities, because it sheds a light on how custom architecture was done around end of 1979.


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  • My Composition Notebooks

    calendar Dec 25, 2022 · 1 min read
     advertisement en  · 6502 business retro-computing
     ·
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    Do you STILL love taking notes by hand? I have created different types of composition notebook, even retro-style one, inspired by MOS6502, with Sprite Editor sheets, and some nice goodies. Give them a try!


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  • My Composition Notebooks

    calendar Dec 25, 2022 · 1 min read
     advertisement en  · 6502 business retro-computing
     ·
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    Retro notebook:right

    Do you STILL love taking notes by hand? I have created different types of composition notebook, even retro-style one, inspired by MOS6502, with Sprite Editor sheets, and some nice goodies. Give them a try!


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  • 8 Bit computers: 2022 Edition!

    calendar Jan 1, 2022 · 1 min read
     books en retro-computing  · 6502 book c64 retro-computing vic20
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    Due to COVID19 pandemic, I and my family was forced in our home. So I revamped my 8bit computer book, with a new look and a nice search engine.


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  • QB64: basic Revenge

    calendar Jun 27, 2020 · 1 min read
     programming_languages  en knowledgebase software  · retro-computing
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    QB64: basic Revenge

    Quick Basic64 is a QBasic compatible programming language actively mantained.


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    Giovanni Giorgi

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