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the uca now supports intel 487 sx x86 fr doc tb s r d lab skip to content x86 fr doc tb s r d lab menu guides the ultimate amd 486 die packaging guide cpu by capacitors projects universal chip analyzer atx2at smart converter websites cpc hardware cpu z validator engineering sample memtest86 monip org about me the uca now supports intel 487 sx released in 1991 and marketed as a floating point coprocessor for the intel 486 sx the intel 80487 was actually a fully featured intel 486 dx with a slightly different pinout intel added an unconnected 169 th pin as a mechanical key for the 487 socket another pin known as mp math present was used to entirely disable the original 486 sx by triggering its back off from bus mode being almost 100 compatible with the 486 dx supporting the 486 sx with the universal chip analyzer was trivial i bought many socket 168 socket and i just drilled a 1 mm hole and it worked immediately according to the 487 s datasheet it was rated at 25 mhz maximum but it also run fine at 33 mhz it is possible to detect a b0 step intel 487 by its unique cpuid 0x421 afaik all retail 487s are b0 step a0 step are engineering sample only with an unknown cpuid maybe 0x420 while testing the 487 i noticed a strange behavior that will deserve more investigation later it seems the 487sx needs a longer reset period to initialize properly compared to a standard 486 technically it makes sense this additional delay might be needed to let the original 486sx disable itself and back off properly from the bus before the 487sx takes full control author doc tb posted on 2021 01 19 2021 01 19 categories universal chip analyzer leave a reply cancel reply your email address will not be published required fields are marked comment name email website save my name email and website in this browser for the next time i comment δ post navigation previous previous post the uca now supports 8087 fpus next next post universal chip analyzer v2 disclosed search for search recent posts via s graveyard exhuming the vt5329e pn133 development board via s graveyard reviving the vt5910a early c7 m unknown cn900 chipset via s graveyard autopsy of the vt5426d first step to mini itx via s graveyard booting the vt5292a apollo ple133 reference board via s graveyard resurrecting the vt5182e apollo mvp4 reference board intel xpress resurrection reviving a forgotten eisa beast intel bong dat master a piece of audio history the limitations of basic cpu testers final update for the uca power supply overhaul major upgrade for the final dip40 adapter the uca now supports intel 8008 epromsdb com the vintage roms collection the uca now supports roms e eproms investigating ssmec s state micro 486s with the uca designing a benchmark for the uca part 1 final universal chip analyzer disclosed uca now able to test early drams all pga 386s benchmarked with the uca the uca now supports c t super386 uca production postponed due to ic shortage experimental pentium overdrive testing with the uca atx2at smart converter firmware 1 21 released universal chip analyzer v2 disclosed the uca now supports intel 487 sx the uca now supports 8087 fpus the uca now supports intel 80186 80188 jtag support added to the uca 486 adapter the universal chip analyzer now supports intel 286 the uca 386 adapter supports ti cyrix 486s the uca 386 adapter now supports intel rapidcad categories atx2at smart converter 4 electronics 3 ic analysis 8 mb analysis 5 universal chip analyzer 43 various 3 archives june 2026 may 2026 april 2026 february 2026 february 2025 december 2024 october 2024 september 2024 june 2024 january 2024 february 2022 january 2022 june 2021 april 2021 january 2021 december 2020 october 2020 september 2020 august 2020 july 2020 may 2020 april 2020 january 2020 november 2019 july 2019 april 2019 march 2019 october 2018 august 2018 june 2018 may 2018 april 2018 february 2018 december 2017 guides the ultimate amd 486 die packaging guide cpu by capacitors projects universal chip analyzer atx2at smart converter websites cpc hardware cpu z validator engineering sample memtest86 monip org about me customized by boldthemes x86 fr doc tb s r d lab proudly powered by wordpress