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Mark McDougall
Works at Virtual Logic Pty Ltd
Lives in Sydney, Australia
33 followers|181,458 views
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Mark McDougall

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At the Computer History Museum, Mountain View, CA
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Ah, the memories.

Mark McDougall

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There are worse ways to get to work, despite the magpies!
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Mark McDougall

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Those CPLDs are doing all the address decoding for the ROM chips for the various games. It would be interesting to know if they've set the security bit in the programming; if not you could find the JTAG connector on the PCB and read the contents out again.
In theory with the CPLD's you could use ROM chips with different faults on different boards to lock out different regions - but you would require a unique CPLD program for each PCB. I suspect they try to place chips with the same fault in the same position on every PCB to minimise the different CPLD configurations required.
Those shorted pins look like they're next to the power pins on those devices.

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I'm curious about the origin of the "Dick Smith Invaders" game. You say it was programmed by contractors for Dick Smith, but it is clearly a port of "Tandy Invaders". Or vice-versa. Any further info on that?
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Mark McDougall

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At the Computer History Museum, Mountain View, CA
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Mark McDougall

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Gameplay starts at 5:35 in a 7:06 video. Meh!

Mark McDougall

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You didn't add the bin directory to your PATH, you added the SGDK directory!

Mark McDougall

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You missed a great port on the TRS-80 Coco / Dragon computer!
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Have him in circles
33 people
Andrew Jens's profile photo
Shane McRetro's profile photo
Terry Stewart's profile photo
Adrian Boscolo's profile photo
Justine Noble's profile photo
Joanna Trube's profile photo
anabela pinto's profile photo
Kylie Kieran's profile photo
Jason Tsung's profile photo
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Male
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  • Spider Solitaire
Work
Occupation
Electronics Design and Computer Software Engineer
Employment
  • Virtual Logic Pty Ltd
    present
    Director, Engineer
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Currently
Sydney, Australia
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