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log entries

  • 3232
    Got the score 30550 in MAME.
  • 2014-12-03
  • 4805
    Got the score 22250. For the first time, I played Defender on the original hardware. Ruben & Bobbie in Copenhagen has a machine, and I struggled with the button layout and got this one decent score after spending a lot of 5 DKK coins...
  • 2014-12-10
  • 4850
    Got the score 26925 in MAME. Theres been quite a bit of Defender going on on the PD MAME machine. Me and Jeppe are narrowly competing for the top.
  • 2015-02-14
  • 5063
    Preparing for my talk at Spilbar on 80s game music and audio technology, I looked into the audio implementation of Defender. It's basically a MC6800 that outputs 8-bit samples to a DAC. All code and data is in a 2048 byte ROM. I've now managed to disassemble and reassemble the ROM and figure out how parts of it works and even write my own replacement ROM with test sounds!
  • 2015-02-23
  • 5094
    My newest Defender sound ROM plays a two-channel music loop, specifically a beepy version of the Lost Empire: Immortals theme.
  • 2015-03-11
  • 5156
    This Sunday, I armed myself with a MC6800 manual and Visual Studio, and made a working Defender sound board emulator in C++. It currently only plays the boot sound, because I haven't implemented the full instruction set yet.