I've added preliminary support for x87 decoding to MartyPC's online x86 disassembler:

https://dasm.martypc.net/?cpu=intel808x&fpu=auto&segment=16&offset=00000100&eu=1&cu=0&hex_gz=H4sIAAAAAAAA_0WSS7bEIAhE56zCJQR9nzA0CvtfUict18zuKaCoo9hV5lmO_2ILIkFRFKU-ijyA0uhpSxn4DHyGKIrSU1EqSkNpIQ84Po6Pk8fxcfI4Po6Pk6fj0_Hp5On4dPJ0fDo-nTyGzwQumo1gc4E8SqBENmeeeMcTQiolpZQQ77jSk3mCzEFUe_M0oJKnkXBD3QpfOTT_K-FWLD8l4SyePcW3YpIKU0FP0BP4fEvPf-UKx9kxdHycKZc0NKZmmRuMkqUyVNbSSZ6J8272A9B8H_9B-QVOYE_1BeIXygAm4AnBitC8n6goDWBp_AH8V7A92B4dYGnkUplHHolvUKACLRvmJXd1lVL_Hsw6knUh-yrsNjw-9Hwvzx8EAAA

This was really the only thing holding it back from being the best retro x86 disassembler on the web; in my humble opinion!

FPU decoding is a second decorator pass on a disassembled ESC instruction. So you can do fun things like disassemble from the perspective of a 386 with 287 FPU, or a 286 with a 287XL.

#retrocomputing #reverseengineering #emulation