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Intel A80487SX

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Comment by MoonKnight (moonknightus[at]yahoo.com):
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]yahoo.com):
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
Transistors:	1,185,000
Circuit Size:	1.00 µ
Introduced:	04/1991
Manufactured:	week 21/1993
Made in:	Malaysia
L1 Cache:	8 KB
CPU Code:	i487 SX
Intel S-Spec:	SZ494
Package Type:	Ceramic PGA-168
Socket:	1/2/3

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