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  Intel A80487SX [flip chip]   []   []   [hide data]   [close image viewer]  
Comment by MoonKnight (moonknightus[at]
Not a real co-processor. This is really just an i486DX in redesigned packaging that, when installed, would disable the onboard i486SX and take over main operation of the CPU/FPU.

Comment by Paul Collins (pi314aussie[at]
Please note, this chip has one-more-pin than a true i486DX chip. It works as a kind of "disable the other guy" pin. This was to facilitate end-user installation, without first removing the system-manufacture's supplied CPU. ie. what end user can remove a PLCC or indeed a PQFP surface mounted chip. The A80486SX "cripple-chip" commonly came in PLCC and PQFP confugurations as often as it came in PGA! Please note, the i486SX "cripple-chip" has the same pins as the true i486DX chip, and are thus pin-for-pin, same-for-same (assuming equal clock).

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Core Frequency:25 MHz
Board Frequency:25 MHz
Data bus (ext.):32 Bit
Address bus:32 Bit
Circuit Size:1.00
Manufactured:week 21/1993
Made in:Malaysia
L1 Cache:8 KB
CPU Code:i487 SX
Intel S-Spec: SZ494
Package Type:Ceramic
Socket: 1/2/3
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