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Microcode in Intel's 8087 floating-point chip: the scale instruction

Ken Shirriff Blog · published 12 September 2026

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14 Sept 2026
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14 Sept 2026
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blog.adafruit.com
Microcode in Intel’s 8087 floating-point chip: the scale instruction Read at the source ↗
14 Sept 2026

Links from this post

Link
Host
https://static.righto.com/images/8087-fscale/8087-die-labeled.jpg
static.righto.com
https://www.righto.com/2020/05/die-analysis-of-8087-math-coprocessors.html
righto.com
https://static.righto.com/images/8087-fscale/8087-datapath-diagram.jpg
static.righto.com
https://static.righto.com/images/8087-fscale/temp-real.jpg
static.righto.com
https://ethw.org/w/images/2/2f/Intel_8086_family_users_numeric_supp.pdf
ethw.org
https://static.righto.com/images/8087-fscale/specials.jpg
static.righto.com
https://github.com/a-mcego/granite/blob/main/tools/8087mc/bin/8087.md
github.com
Conditions in the Intel 8087 floating-point chip's microcode Read at the source ↗
righto.com
https://static.righto.com/images/8087-fscale/microcode-structure.jpg
static.righto.com
Instruction decoding in the Intel 8087 floating-point chip Read at the source ↗
righto.com
https://www.righto.com/2020/05/extracting-rom-constants-from-8087-math.html
righto.com
https://static.righto.com/images/8087-fscale/float-to-int.jpg
static.righto.com
https://static.righto.com/images/8087-fscale/8087-package.jpg
static.righto.com
https://blogs.mathworks.com/cleve/2014/07/21/floating-point-denormals-insignificant-but-controversial-2/
blogs.mathworks.com
https://static.righto.com/images/8087-fscale/denorm.jpg
static.righto.com
https://static.righto.com/images/8087-fscale/rounding.jpg
static.righto.com
https://static.righto.com/images/8087-fscale/real-sizes.jpg
static.righto.com
http://bitsavers.informatik.uni-stuttgart.de/components/amd/_dataSheets/Am9511_Algorithm_Details.pdf
bitsavers.informatik.uni-stuttgart.de
https://ethw.org/Milestones:IEEE_Standard_754_for_Binary_Floating-Point_Arithmetic,_1985
ethw.org
https://web.archive.org/web/20260316121248/https://people.eecs.berkeley.edu/~wkahan/ieee754status/IEEE754.PDF
web.archive.org
https://bitsavers.org/pdf/intel/MDS3/121725-001_8087_Support_Library_Reference_Aug81.pdf
bitsavers.org
https://bsky.app/profile/righto.com
bsky.app
https://github.com/a-mcego/granite/tree/main/tools/8087mc
github.com
https://static.righto.com/images/8087-fscale/patent-diagram.jpg
static.righto.com
https://patents.google.com/patent/USRE33629E
patents.google.com
The adder at the heart of Intel's 8087 floating-point chip Read at the source ↗
righto.com
https://static.righto.com/images/8087-fscale/control-flow.jpg
static.righto.com
https://github.com/a-mcego/granite/blob/main/tools/8087mc/bin/8087mc_out.txt
github.com