On Mar 5, 2009, at 8:17 AM, Nate Raymond wrote:
> So obviously a 68040 labelled as a 40Mhz model will run at 40Mhz, > whereas a 25Mhz 040 running at 40Mhz will be luck of the draw > (ignoring whether or not other components are also happy running at > higher speeds than they are rated for). I went away from Moto-based Macs long ago, but "back in the day" when I was dedicated to Moto Macs, I owned quite a few, and experimented with most of them. The 040s, based upon my experiments, would usually "speed bump" one step. 25 could to to 33. 33 could go to 40. 40 could go to 50. Etcetera. On most models, the oscillator is in a DIP package, and I desoldered it and installed a special "crystal" socket. The oscillator was usually 2 times the CPU's clock speed, meaning 66 MHz for a 33 MHz processor, etcetera. One problem with the 040 line was the PPC PDS processor upgrades. Apple's would speed bump OK, but Sonnet's would not. --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Vintage Macs group. The list FAQ is at http://lowendmac.com/lists/vintagemacs.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/vintage-macs?hl=en Low End Mac RSS feed at feed://lowendmac.com/feed.xml -~----------~----~----~----~------~----~------~--~---
