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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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  • About 6502 emulator

    calendar Dec 16, 2019 · 1 min read
     knowledgebase retro-computing  · 6502 c64 retro-computing
     ·
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    About 6502 emulator

    I’d like to point you to this blog article about “cycle stepped” 6502 emulator. It is well described and can be a neat read for xmas vacation.


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  • Commander X16: retro magic dream

    calendar Sep 19, 2019 · 3 min read
     it lettere-a-mia-figlia  · c64 retro-computing
     ·
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    Tempo fa ho citato il progetto Pyc64, un C/64 “diversamente emulato”. Esiste un progetto molto più ambizioso che sta andando in pressione, si chiama Commander X 16, ed è partito da David Murray e da altre tre persone.

    Il desiderio di David era quello di creare un computer a 8bit simile al C/64 ma un po’ più comodo da usare: per esempio con 80 colonne, ma non con troppa potenza di calcolo, in modo da non snaturare la sua natura “retrò”.

    Anche io avevo un desiderio simile ed ero approdato al Pyc64 che univa il meglio del python ad una emulazione degli sprite e ad un minimo di possibilità di scrivere codice in linguaggio macchina. Ma ovviamente era tutto fatto via software, non c’era una macchina reale, ed inoltre aveva parecchi limiti.


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  • Commander X16: retro magic dream

    calendar Sep 18, 2019 · 2 min read
     en featured retro-computing  · c64 retro-computing
     ·
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    Some time ago I mentioned the Pyc64 project, a “differently emulated” C/64. There’s a much more ambitious project that’s going under pressure, it’s called Commander X 16. Commander X 16 has been started by David Murray and three other guys.


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  • 8 Bit computers: from 1977 to 1985

    calendar Jun 27, 2019 · 1 min read
     books en retro-computing  · 6502 book c64 retro-computing vic20
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    The first draft of my book is here! Take a look to http://8bit.gioorgi.com/


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  • Coming soon 8 Bit computers: from 1977 to 1985

    calendar May 21, 2019 · 2 min read
     books en retro-computing  · 6502 book c64 retro-computing vic20
     ·
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    Hi all! I decided to write a book called “8-Bit Computers: Retro computer history in the ‘80”. It is my first book on this topic, so I need you comments & advices! A small extract is right here for download.


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Latest comments

  • An update: The FAIR Package Manager: Decentralized WordPress infrastructure https://www.linuxfoundation.org/press/linux-foundation-announces-the-fair-package-manager-project-for-open-source-content-management-system-stability

    See https://news.ycombinator.com/item?id=44207503

    ...by daitangio
  • BuonGioorgi. Vero che HP Prime costi meno di DM42, ma l'RPN su Prime non è un gran che. Inoltre, la compatibilità con HP42s ed HP41c dove la mettiamo ? Su DM42(N) gira praticamente tutto. E per ultimo: devo spendere più di 200€ sulla baia per un HPxxx vecchio di anni, e che nessuno eventualmente riparerà, in caso si rompesse ? Meglio mettersi una mano sul cuore ed una sul portafogli... Disclaimer: non prendo soldi da SwissMicros :-)

    ...
    by Claudio
  • Buongiorno Giorgi. Post chiarissimo e ben scritto. Unica inesattezza: il TCNTn indica il valore attuale del conteggio, che di default parte da 0 ma che tu, nell'esempio modifichi per avere il delay di 1 secondo. Da come hai scritto tu ("Questo registro indica il valore al quale far scattare il timer. Il timer contera' a partire da zero fino....") in questo registro scriverei 15625 per farlo scattare ogni secondo.

    ...
    by Gianmarco
  • For timezone managmenet please refer to https://medium.com/devopsturkiye/how-to-set-timezone-for-kubernetes-cronjobs-691d3aaa34ef

    ...by daitangio
Giovanni Giorgi

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