>Erm, no. it's the model numbers 631CD, 630 DOS Compatable and the 640 DOS >Compatable which had 2 SIMM slots.
Well it's funny that I have a Performa 630 (with CD) and it's got 2 SIMM slots. To the best of my knowledge it's never been a DOS machine either. Kinda puts a bit of a clanger on that theory don't it ;). I think you will find that it is very much more arbitrary as to whether Apple put 2 or 1 slot logic boards in the machines in question. From my experience trying to fathom the mystery of when they swapped from the 2nd to the 3rd design of LC case, I can tell you it's probably not even related to the model of machine, instead it depends on what was available at the time and which models required what related to other parts needed and used. Sound complicated? Sure it is, that's what designing as manufacturing process is all about. My theory is that, while the 630 machines were being made and sold, Apple was making the boards on a batch process and shipping them to their various assembly plants to be put into the cases (which are all the same bar the CD/non CD bezels -AFAIK). At some stage they merged in a new design of logic board with more memory space available (2 slots instead of 1) to be used on all models. This filtered into all the machines eventually but meant that some lines got old boards and some new, inevitably. If you polled every single 63x machine in the US and Europe you may be able, after cross referencing the data with the time of release of various models, to determine a rough timescale for the transition but no more than that, unless you look at the manufacturing and assembly logs. It's only a theory but I think it's pretty sound..... -- -- Mark Benson Any spelling errors are attributed to PEBKAC Vintage Macs List Nanny SilValleyPirate - AIM silicon_valley_pirate_uk - Yahoo! Visit Flat Pack Macs Online: <http://fpm.gotdns.com> Macintosh LC Central -- Quadlist is sponsored by <http://lowendmac.com/> and... Small Dog Electronics http://www.smalldog.com | Enter To Win A | -- Canon PowerShot Digital Cameras start at $299 | Free iBook! | Support Low End Mac <http://lowendmac.com/lists/support.html> Quadlist info: <http://lowendmac.com/lists/quadlist.shtml> The FAQ: <http://macfaq.org/> 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/quadlist%40mail.maclaunch.com/> Using a Mac? Free email & more at Applelinks! http://www.applelinks.com
