At 14:13 -0800 12/19/2002, Will Schou wrote: >I believe that to be correct but only Kennedy would know for sure. I >looked at my extra machine and it says revision A next to the serial >number and has no jumper pins. Doesn't really have a date other then >UMAX Stormsurge 1996 stamped on board. >Jeff W checked motherboards out pretty closely including chips on the >boards a while back and found no differences at all except for a few >people having the J38 jumper pins to disable L 2 cache. I'm sure he >will correct me if I'm wrong ;-)
Will, you're doing great. >Differences in the way different machines act has been traced to cards >,cpu ,ram chips and software added. later Will S The main components on the boards simply can't vary, because they're chips from Apple and there was no other source. Umax could (maybe) have used several different chips instead of the DEC 21052 that they used, but perhaps there were fewer options available when the board was made. Today, I've identified at least five pin compatible chips which serve the same function and tried them all in the S900 with no change in the machine's behaviour. But I'm pretty sure that at least two of those weren't available when the S900 was being manufactured. There are a number of minor buffer chips and such which Umax could have changed or varied the supplier of, but they don't appear to have done so. In contrast, there are several revisions of the PowerTower Pro board from Power Computing and they do change the type of chip they used as the buffer between (guessing a little here) the cache and CPU sockets and the CPU and RAM in later revisions. But the Umax design seems pretty unchanging as far as components and layout of the board goes. If there were changes in the board layout, they were subtle. I haven't seen an S910 board. Jeff Walther -- SuperMacs is sponsored by <http://lowendmac.com/> and... Small Dog Electronics http://www.smalldog.com | Refurbished Drives | Service & Replacement Parts [EMAIL PROTECTED] | & CDRWs on Sale! | Support Low End Mac <http://lowendmac.com/lists/support.html> SuperMacs list info: <http://lowendmac.com/supermacs/list.shtml> --> AOL users, remove "mailto:"; Send list messages to: <mailto:[EMAIL PROTECTED]> To unsubscribe, email: <mailto:[EMAIL PROTECTED]> For digest mode, email: <mailto:[EMAIL PROTECTED]> Subscription questions: <mailto:[EMAIL PROTECTED]> Archive: <http://www.mail-archive.com/supermacs%40mail.maclaunch.com/> --------------------------------------------------------------- >The Think Different Store http://www.ThinkDifferentStore.com ---------------------------------------------------------------
