Thanks Thanks:  0
Welcome Welcome:  0
Results 1 to 1 of 1

Thread: Smaller Paddles = Bigger Fun

  1. #1
    Join Date
    Jun 2008
    State
    Brisbane, QLD
    Posts
    2,583
    Mentioned
    252 Post(s)
    Quoted
    502 Post(s)

    Smaller Paddles = Bigger Fun

    The Kelso Mod



    Original Paddle Size:



    Modded Paddle Size:



    I saw this mod a while ago and decided to knock it up and see if it works.
    Most of the info below has been copied from here... https://imgur.com/gallery/A5piX

    In season 1 Ep22 of That 70's Show, Kelso mods a Pong to make the paddles smaller.
    If you play Pong for a while it can get a little boring especially if there are two equally skilled, good players.
    This mod adds another level to the difficulty.

    Game play video:



    Video explaining the inspiration:



    Paddle 1 Control - Original Schematics




    Paddle 1 Control - Modded Schematics




    Getting smaller paddles is fairly simple (if you understand digital electronics). In normal operation the 555 timer is triggered by vertical blanking, delays for a time set by the players control, then triggers the 74LS93 4-bit counter. The counter increments every horizontal sweep, from 0 to 15 (total 16); from 0 through 14 the NAND output is 1 which means the paddle is drawn on screen. On count 15 (binary 1111) the NAND output goes to zero, stopping the counter and the drawing of the paddle, therefore the paddles are 15 vertical pixels long. Signals B, C and D are used to calculate where on the paddle the ball collided, which sets the return velocity. This process is re-triggered every 1/60th of a second by the vertical blanking.

    To get smaller paddles:
    Signals B, C and D now use the lower 3 bits (weighted 1-2-4) of the counter instead of the upper 3 bits (weighted 2-4-8). The NAND stops the counting at 7 (binary 111) instead of 15. Thus the paddles are 7 vertical pixels long. In theory, the paddles could be set to any number of pixels from 1 to 15.

    Here's the mod itself..


    Last edited by Kaizen; 17th January 2019 at 08:28 PM.
    Namco Starblade - Taito Cocktail 14" x 3, 20" x 2 - NZ SI PtII Upright - Chase HQ DX, Taito Top Speed - Taito Grand Champion - Taito Safari - LAI SI Head to Head Cocktail - SI Cocktail Clone x 2, Pong Clone x 3

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. When bigger is better....well maybe?
    By Sando75 in forum Arcade
    Replies: 5
    Last Post: 13th April 2011, 01:38 PM
  2. New version 60-in-1 (smaller) - placing order
    By Frank_fjs in forum Multi Board Discussion and Help
    Replies: 30
    Last Post: 27th November 2010, 06:30 AM
  3. Need a bigger shed
    By Simon_A in forum Arcade
    Replies: 2
    Last Post: 11th February 2008, 11:43 AM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •