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Intel 80C188 with coprocessor
Posted: Thu Mar 07, 2024 9:34 pm
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.
Re: Intel 80C188 with coprocessor
Posted: Fri Mar 08, 2024 6:06 pm
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 I think this is obsolete today and could be replaced by FPGA.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
- 80186-8087-82188.jpg (88.45 KiB) Viewed 1232 times
Re: Intel 80C188 with coprocessor
Posted: Sat Mar 09, 2024 11:14 pm
by Yoshi
why not use 80C187 ?
- 80C187
- 80c187.jpg (45.36 KiB) Viewed 1223 times