On 9/18/06, aliensrcooluk at yahoo.co.uk <aliensrcooluk at yahoo.co.uk> wrote: Not of use how? I've never owned an A600 (I have just about every other model)... do they have PLCC (square-package) CPUs? Were you trying to aquire these chips for spares or for an upgrade? Sounds like a Motorola CPU that can run as fast at 10MHz (they marked them as high as 12MHz, but I think those can be clocked at 16MHz). Sounds like a Signetics or similar licensed "clone" 68000 made in late 1990 (week 35). At one point, there were several makers of the CPUs, including Toshiba. Um... pretty much anything that would use a 68000 at 10MHz or slower (the earliest chips were 4MHz, but 8Mhz was very common). They'd work in an A1000, A500, A2000, Perkin-Elmer UNIX 73xx workstation, some VAX peripherals like a DMB32 serial interface, several Atari models, older Macs (original 128K, 512K, Plus, Mac/SE...), the Sega Genesis game console and plenty more places. Were you looking for a 68010? That was a common upgrade in the A1000/A500/A2000 days - for about $20, you used to be able to get them new. They were a revision to the 68000 with the specific features of 99% binary code compatibility (the MOVEcc instruction became priv'ed on purpose); "loop mode" - a one-instruction cache that allowed simple "DBcc" loops to forego re-fetching the MOVE instruction, something that allowed block moves to execute 50% faster, resulting in a "free" ~5% speed increase in practice on an Amiga; and "virtual memory support" - the ability to generate a page fault and save enough state to allow the OS to grab a page from disk, then restart the instruction right where it left off as if nothing had happened. UNIX on the 680x0 architecture relies on instruction restart to implement virtual memory (though the Perkin-Elmer workstation I mentioned earlier used a pair of 68000s to perform the same task - one would be halted while the other fetched the page from disk). Amigas don't care about instruction restart, but the oldest Sun workstations came with 68010s for that very reason, as did the AT&T UNIX PC. Hope this all makes sense and is useful to you. -ethan