Author: David (68-118-40-3.dhcp.grps.or.charter.com)
Date: 02-13-2011 07:56
I have recently been playing with the 68SEC000 chips rated at 20MHz and have successfully had them running at 40MHz without feeling warm, and 56MHz without needing a heat sink, with a heat sink and fan I have ran the 68SEC000 at 80MHz (4x rated speed). Though admittedly this is all on a home made test board, I do not see how you could put it in an existing system unless you made a cache board for it keeping the bus speed to the system down.
I have heard of people running the minimig (witch is based on the 68SEC000) at up to 56MHz, though the CPU clock on the minimig is asynchronous to the system clock (at least as I understand it).
Ok I will grant you that no early generation 68000/68EC000/68HC000 has any chance of exceding 24MHz, though the 68SEC000 does, and a darned good job at it.
