On Jul 23, 2009, at 10:37 PM, Gregg Eshelman wrote:
> Then Apple gets the bright idea to come up with the oddball 19 pin > D connector shoehorned between the DA and DB sizes. This was the cheapest overall solution as tooling already existed to make all of the two-row D-Subs, and the "precision formed" contacts were identical to those in all the others. They needed 20 positions, as that was the size of the ribbon cable, but 19 external positions was fine, too, with one redundant wire deleted. Subsequent Super Drives would delete yet another wire. Simple economics at work. One problem when making mechanical parts for "DB-19s" is no one makes punches in that size, so the cutouts have to be cut by laser, which is costly, or double-punched, which produces a rough result. --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
