Intel 80C188 with coprocessor

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Altair
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Joined: Sat Oct 07, 2023 7:15 am

Intel 80C188 with coprocessor

Post by Altair »

Does anyone know how to connect the 8087 numerical co-processor to the embedded CPU 80C188 or 80C186?
I spent a lot of time searching the net and found very little about 80C188 and nothing about a possible connection to 80C87. :(
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visionics
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Joined: Sun Sep 17, 2023 8:13 am

Re: Intel 80C188 with coprocessor

Post by visionics »

The connection between 80C188/80186 and 8087 is possible via a special interface circuit 82188. I've never seen the 82188. I only know him from a small photo. Many years ago I had a message that this chip actually existed, but was only available to military customers. There is an application note (AN-258) from Intel that describes how to connect the 82188. I think this is obsolete today and could be replaced by FPGA. Here is drawing from the Intel AN-258:
Intel AN-258, connection 8087 to 80188/80186
Intel AN-258, connection 8087 to 80188/80186
80186-8087-82188.jpg (88.45 KiB) Viewed 219 times
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Yoshi
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Joined: Fri Jun 30, 2023 11:03 pm

Re: Intel 80C188 with coprocessor

Post by Yoshi »

why not use 80C187 ?
80C187
80C187
80c187.jpg (45.36 KiB) Viewed 210 times
映像ソフト開発に積極的に取り組んでいます
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