CPU Shack: NEC's forgotten FPUs

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CPUShack



Joined: 16 Jun 2003
Posts: 34259
Location: State of Jefferson, USA

PostPosted: Wed Sep 01, 2021 9:25 pm    Post subject: CPU Shack: NEC's forgotten FPUs Reply with quote

https://www.cpushack.com/2021/09/01/necs-forgotten-fpus/

I was waiting for a better die shot of the mystery FPU, but the post office is conspiring against aberco and I, so here we go for now.

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rjluna2



Joined: 27 Oct 2014
Posts: 1302
Location: Hiram, GA, USA

PostPosted: Thu Sep 02, 2021 6:59 am    Post subject: Reply with quote

That is an interesting article here Smile

Perhaps too forgotten math co-processor here Wink

https://en.wikipedia.org/wiki/NEC_V60#AFPP_(co-FPP)
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CPUShack



Joined: 16 Jun 2003
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Location: State of Jefferson, USA

PostPosted: Thu Sep 02, 2021 11:46 am    Post subject: Reply with quote

rjluna2 wrote:
That is an interesting article here Smile

Perhaps too forgotten math co-processor here Wink

https://en.wikipedia.org/wiki/NEC_V60#AFPP_(co-FPP)


yup thats the D72291 and 72691 talked about in the article Smile

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max1024



Joined: 15 Jan 2015
Posts: 636
Location: Belarus

PostPosted: Thu Sep 02, 2021 1:34 pm    Post subject: Reply with quote

Wow its article like the The X-Files where CPUShack is Special Agent - Fox Mulder. Cool story!, real investigation Smile
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CPUShack



Joined: 16 Jun 2003
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PostPosted: Mon Sep 06, 2021 6:20 pm    Post subject: Reply with quote

I just booted one of these in a molka MCS-86 test board

The timing might be off a hair as sometimes they throw an FPU error on the board, but they otherwise satisfy what the board tests for the 8087

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