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I'm trying to get a Midway (L) Space Invaders set back up and running. I started with gibberish on the screen... Eventually found that C7 (9310/74160) was bad and missing 2 signals out (pins 13 and 11 IIRC). I didn't have a 74160 so I bought a couple of 74LS160s. Now I'm getting good clock signals on every pin except for 13... it should be 2MHz, but it flutters between 3.3MHz and 5MHz. I tried both of the LS160s and they both behave the same, even with the pin lifted out of the socket.

Is a 74LS160 not fast enough? I'm checking before I order 74160/9310s since they aren't exactly giving those away (looking at eBay).
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