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    neilobremski

    There Is No Subtraction

    These wonderful digital processing units of ours are, at their heart, very fast binary adders. There may be a SUBtract instruction but this is the same as adding the two's compliment of a number. ...

    April 25th, 2017 04:01 PM
    neilobremski

    The Great DIVide

    The DIV and IDIV instructions perform integer divisions simply and relatively quickly as opposed to creating a simple loop. Let me start by showing how one could divide an integer without these...

    April 24th, 2017 09:53 AM
    neilobremski

    ASCII / BIOS Character Graphics

    Even back on the original IBM PC you could get read-only access to the glyph pixel data for the standard ASCII character set, extended ASCII, and control characters with codes less than 32 (0x20) . ...

    April 18th, 2017 01:26 PM
    neilobremski

    DDA Texture Mapping [Part 1]

    I am learning and working on a quadrilateral DDA texture mapper for CGA that uses the 8x8 monochrome BIOS characters for texels, for use in an optimized version of Magenta's Maze. Reading Mats and...

    April 17th, 2017 10:22 AM
    PixelTHING

    The Complete Story of LucasArts (Part II - Final) | It's a Pixel THING - Ep. 116

    Here's the conclusion of #PixelTHING's Complete Story of Lucasfilm Games / LucasArts! Let's take a look at the last 22 years of LucasArts gaming history! Enjoy! The Complete Story of LucasArts...

    April 15th, 2017 02:22 AM
  • Recent Forum Posts

    KenEG

    There is a switch setting. On my clone, it is...

    There is a switch setting. On my clone, it is switch 7. On is two drives, off one. I'm not sure if the IBM switches work the same.

    KenEG Today, 07:42 AM Go to last post
    MikeS

    I'm curious: does that 3-digit year Y2K trick...

    I'm curious: does that 3-digit year Y2K trick work as far back as V 162?

    MikeS Today, 07:40 AM Go to last post
    KenEG

    Inspect the battery and the area around it for...

    Inspect the battery and the area around it for leakage. If there is leakage, clean the area of residue and replace the battery before proceeding. If no leakage, go into setup and see if you can set...

    KenEG Today, 07:39 AM Go to last post
    Malc

    Yup, It is made in China after all.

    Yup, It is made in China after all.

    Malc Today, 07:31 AM Go to last post
    glitch

    Probably there to add weight, looks like a pretty...

    Probably there to add weight, looks like a pretty cheap and otherwise very lightweight supply.

    glitch Today, 07:24 AM Go to last post