Identifying a Mystery ISA Card
w9gb at icloud.com
Sat Oct 17 14:01:41 CDT 2020
You might get lucky, IF Jameco still has documentation & software for the board.
I would guess circa 1982-1985 (after IBM XT introduction with 256 kB standard).
Japan in 1970s and Taiwan in 1980s ... had major production issues with PCB fabrication and assembly (required higher QC in source materials).
“After-sale” (under warranty) Component-level service bench techs —
were frequently heard ‘swearing’ at the incompetence across the Pacific.
Thru-hole “vias” for double-sided boards frequently failed.
Solder alloy and Flux formulations (Asia didn’t want to buy Weller or Ersin/Multicore) were especially troublesome. In many instances, the old solder has to be removed (difficult de-soldering due to impurities in Asian solder).
These problems continued through 1980s,
until the “bad shops” closed or changed their production operations.
Using a Quality 63/37 or 60/40 “RA” solder (like Kester “44”), resolves most issue,
other than copper solder trace failures.
From: Sean Ellis <seanellis9 at gmail.com>
To: Chuck Guzis <cclist at sydex.com>, "ClassicCMP” <cctalk at classiccmp.org>
Subject: Re: Identifying a Mystery ISA Card
Well, thanks for all the help guys - Finally narrowed it down to a
JE1078 on Stason:
I can believe this thing was made in Taiwan - I had to repair probably
1/4 of all the joints on the card because they all had gone dry or had
holes in the joints. Have you ever seen solder bubble like boiling
water? That's how bad the original solder on this card was. It also
absolutely stank the whole way through...
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