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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

    lynchaj

    I have thought about various "what if" retro...

    I have thought about various "what if" retro computer designs over the years. One idea I've been kicking around lately is what if IBM had gone straight to Intel for the PC design rather than relying...

    lynchaj Today, 03:01 AM Go to last post
    XDUR

    I Found information about the Tandy 1400HD on the...

    I Found information about the Tandy 1400HD on the radio shack support website:...

    XDUR Today, 02:39 AM Go to last post
    Chromedome45

    Wow ok then. You really do have a lot of Macs,...

    Wow ok then. You really do have a lot of Macs, Apple systems

    Chromedome45 Today, 02:33 AM Go to last post
    Roland Huisman

    There are absolutely no secrets for me in power...

    There are absolutely no secrets for me in power supplies. :-)
    http://www.vcfed.org/forum/showthread.php?36705-Schematics-Astec-9251-power-supply&p=272966#post272966
    But that is exactly why I did...

    Roland Huisman Today, 02:16 AM Go to last post
    MattisLind

    I will look into the octart a bit more to see...

    I will look into the octart a bit more to see what is wrong now when I have the system up. But getting timeouts makes me think that the download fails due to board not responding properly. I will try...

    MattisLind Today, 01:55 AM Go to last post