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

· Adafruit Industries Blog · Sept. 14, 2026, 9:21 p.m.
Die Shot reverse engineering 8087 Intel reverse engineering microcode Intel 8087 Opcode Collective
Summary
Ken Shirriff explores the microcode of Intel's 8087 floating-point coprocessor, focusing on the FSCALE instruction, through his collaboration with the Opcode Collective, who are reverse engineering the coprocessor's micro-instruction ROM.
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