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Article #2214

Need schematics to fix broken VT100-AA

#2214
From: Jim - Hickstein
Date: Sat, 26 Nov 1988 02:35
20 lines
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Looking at the recent traffic in this group, it seems that every so often
someone will ask for a copy of the engineering drawing set for a VT100-AA
so they can do something to it: well, bear with me as I'm not going to be
an exception.

I've got a VT100-AA that *almost* works.  The video display contains
characters (I fixed a worse problem to get it this far), but not the correct
ones.  I've got a logic analyzer at my disposal, but haven't spent much time
at this, since working without drawings is discouraging.  The terminal
belongs to a friend who doesn't really need it fixed, but I want to complete
this and get it out of its current condition, even if all I'm going to do with
it is throw it away once I get it to function.

Could someone send me the crucial two pages (I suspect) that contain the
video refresh circuitry or, failing that, interpret my symptoms over the net
or over the phone to help me fix this thing?  Please reply by email. Thanks.

-Jim Hickstein
jxh@cup.portal.com
...!sun!portal!cup.portal.com!jxh
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Message-ID: <11783@cup.portal.com>
Path: arc1-ca.pugleaf.net!utzoo!utgpu!watmath!clyde!att!osu-cis!tut.cis.ohio-state.edu!bloom-beacon!mit-eddie!uw-beaver!tektronix!uunet!portal!cup.portal.com!jxh

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Path: arc1-ca.pugleaf.net!utzoo!utgpu!watmath!clyde!att!osu-cis!tut.cis.ohio-state.edu!bloom-beacon!mit-eddie!uw-beaver!tektronix!uunet!portal!cup.portal.com!jxh
From: jxh@cup.portal.com (Jim - Hickstein)
Newsgroups: comp.terminals
Subject: Need schematics to fix broken VT100-AA
Message-ID: <11783@cup.portal.com>
Date: 26 Nov 88 02:35:01 GMT
Distribution: na
Organization: The Portal System (TM)
Lines: 20