uPD1771C noise puzzle May 28, 2010 Get link Facebook X Pinterest Email Other Apps LFSR feeding a delta-modulated logarithmic DAC??? Evil 80's reverse engineering protection??? Alien message? Comments King of the SpillJuly 4, 2010 at 11:06 PMIt looks like rising exponentials on the positive side, decaying exponentials on the negative side. Not that hard to create with digital logic, though probably time consuming to exactly recreate.ReplyDeleteRepliesReplyplgDavidJuly 5, 2010 at 4:50 AMHiSure, but the precise steps heights and the distance between gap 'resets' is controlled by two or more clocks. This chip really needs decapping.ReplyDeleteRepliesReplyKing of the SpillJuly 5, 2010 at 10:35 PMI took a crack at it. I think one clock can certainly get you something similar.http://8bc.org/forums/viewtopic.php?pid=327085#p327085ReplyDeleteRepliesReplyAdd commentLoad more... Post a Comment
It looks like rising exponentials on the positive side, decaying exponentials on the negative side. Not that hard to create with digital logic, though probably time consuming to exactly recreate.
ReplyDeleteHi
ReplyDeleteSure, but the precise steps heights and the distance between gap 'resets' is controlled by two or more clocks. This chip really needs decapping.
I took a crack at it. I think one clock can certainly get you something similar.
ReplyDeletehttp://8bc.org/forums/viewtopic.php?pid=327085#p327085