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Article #1563When is S-100 NOT S-100 (Ithaca Encore)
From: Margaret H. Knox
Date: Sun, 22 May 1988 00:35
Date: Sun, 22 May 1988 00:35
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My thanks to Mr. Peter Collins (whose reply to me bounced across half the hosts in the US) for pointing out the reason for the *CAUTION* on the S-100 cards in an Ithaca ENCORE system. S-100 systems normally put out filtered (but unregulated) voltage on the power lines (for instance, > 7 volts DC for VCC). This is then regulated on each S-100 card, distributing the heating and allowing the use of the small 1 - 3 amp 7805-type regulators. The ENCORE regulates the voltages AT THE POWER SUPPLY. The boards are standard S-100, but the place for the regulators are bypassed (shorted across) As Mr. Collins points out: Put an ENCORE card in a normal S-100 chassis and it will make fireworks!
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Path: arc1-ca.pugleaf.net!utzoo!attcan!uunet!husc6!bbn!uwmcsd1!ig!agate!ucbvax!EMX.UTEXAS.EDU!mknox From: mknox@EMX.UTEXAS.EDU (Margaret H. Knox) Newsgroups: comp.sys.misc Subject: When is S-100 NOT S-100 (Ithaca Encore) Message-ID: <8805220035.AA19312@emx.utexas.edu> Date: 22 May 88 00:35:43 GMT Sender: daemon@ucbvax.BERKELEY.EDU Organization: The Internet Lines: 15