Just to be clear, INS is National Semiconductor a.k.a. "NS". I
don't recall NEC (Nippon Electric Corp) being a big player in the
U.S in the late 70's, but maybe they were. I would expect that NS
could easily have been an official second-source (often a
requirement for Military/Government contracts), and thus the chip
was likely identical to Intel's. Conjecture, of course.
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A shame to have to do a “reset” on this design but understandable…
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Two lessons learned here:
Norberto
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I finally re-created the same circuit as in the H8-5 board. Also, I used same IC’s designations and place components as on the original board. Next steps is to do some clean up and to review the schematics to be correct.
The H8-Cassette circuit takes half of the board. The other half is for the UARTS and USARTS.
Here are some pictures…
Norberto
From: se...@googlegroups.com <se...@googlegroups.com>
On Behalf Of norberto.collado koyado.com
Sent: Monday, June 27, 2022 12:31 PM
To: se...@googlegroups.com
Subject: Re: [sebhc] Cassette motor control question
Two lessons learned here:
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On Jul 2, 2022, at 3:44 AM, norberto.collado koyado.com <norberto...@koyado.com> wrote:
I finally re-created the same circuit as in the H8-5 board. Also, I used same IC’s designations and place components as on the original board. Next steps is to do some clean up and to review the schematics to be correct.
The H8-Cassette circuit takes half of the board. The other half is for the UARTS and USARTS.
Here are some pictures…
Norberto
To view this discussion on the web visit https://groups.google.com/d/msgid/sebhc/SN6PR01MB385594D3CF5DB5D789010EC9F7BC9%40SN6PR01MB3855.prod.exchangelabs.com.