Xref: utzoo unix-pc.general:4815 comp.sys.att:8784 Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!ames!mips!apple!portal!portal!cup.portal.com!thad From: thad@cup.portal.com (Thad P Floryan) Newsgroups: unix-pc.general,comp.sys.att Subject: Re: No more 3B1 power supplies at Halted Specialties Message-ID: <26893@cup.portal.com> Date: 13 Feb 90 20:49:54 GMT References: <26789@cup.portal.com> <363@usna.MIL> Organization: The Portal System (TM) Lines: 27 trw@usna.MIL (tsmith ) in <363@usna.MIL> writes: "In article <26789@cup.portal.com>, thad@cup.portal.com (Thad P Floryan) writes : "> As I and several others discovered today (Friday, 9-Feb-1990), Halted has NO "> more 3B1 power supplies; they still have a quantity of 7300 power supplies. "> "I'm a virtual newcomer to this machine (having just acquired 2) but what "precisely is the difference?? I thought the 3b1 and the 7300 were the "same machine. " "bill gunshannon The 3B1 supply is 245W with 5A at 12VDC, the 7300 supply is 195W with 3.5A at 12VDC; both supply 20A at 5VDC. The -12VDC comes in several variations depending on revision level; doesn't seem to make any practical difference. Other differences: 1) 3B1 powers its hard drive directly from power supply; 7300 powers its hard drive off the motherboard. 2) different model of TEAC floppy drive (3B1 has spring-eject, and seems quieter) 3) 3B1 keyboard has a "writeable" strip above function keys 4) 3B1 has "hump" at case center for full-height hard drive 5) 3B1 has one fan, (most) 7300s have two fans Thad Floryan [ thad@cup.portal.com (OR) ..!sun!portal!cup.portal.com!thad ]