i have a led display board from a dlink 24port Ethernet switch. the board has 3 4x4 led matrix on it and is driven by 6 chips believed to be HC164.
the chips have on them: (texas instruments symbol 1st then) 38 EYF 5K HC164
i found this datasheet: linky to pdf
and its interfaces with a 16 core ribbon cable,. 7 or them seem to be gnd and 3 of them +V witch leaves 6. 3 of those are connected to the clock pins (pin 8, 2 chips share one of the 3 cable pins), the other 3 pins are connected to pin 1 on 3 of the chips and those 3 chips are connected to the other 3 chip's pin 1 via pin 13. so each pair of chips controls 1 4x4 matrix.
thats all i can gather from this board by looking at it. anyone know how i can use this? it would make for a nice looking sound level meter or scrolling display :)
will post pics soon.