PeterH wrote: > > 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.
Apple was for a long time squeezed for space on the back panel of their computer. Because of it we got the D-19 floppy connector. When the DB-25 was added for SCSI the serial ports got squished down from two DE-9s to two Mini-DIN 8s. It's also why Apple created the AAUI Ethernet connector, it's a lot smaller than the usual AUI DA-15. It's kind of ironic, when you look at modern Macs they have a smaller bank of connectors now what with FireWire, USB, and RJ-45 connectors. -- Clark Martin Redwood City, CA, USA Macintosh / Internet Consulting "I'm a designated driver on the Information Super Highway" --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
