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Intel 80486 Promotion kit

 

  Promotion kit overview  

The kit includes three generations of Intel x86 microprocessors from 80386 SL to Pentium. The 80386 and three 80486 processors in the kit don't have bottom lids so it's possible to see microprocessor dies. Pentium family in the kit is represented by production version of Pentium 60. 80486 promotion kit - front view  80486 promotion kit - back view 
 
 

  Pictures of individual processors  

The only processor from 80386 family in the kit is 80386SL. It's a mobile microprocessor with 80386 core and power-saving features that are not present in desktop 80386. This CPU has unusual for x86 microprocessors package - land grid array (LGA). Interesting that 80386SL had more than 800,000 transistors - three times as many as in a desktop 80386SX/DX processor. Intel 80386SL processor - front view  Intel 80386SL processor - back view 
The first processor from 80486 family is 80486SX. The chip has Intel 486 logo on the front, but doesn't have part number and other markings. The kit claims that the SX processor has 800,000 transistors. This contradicts to other Intel sources. According to them SX processors had about 1.2 million transistors for 1 micron chips, and 0.9 million transistors for 0.8 micron chips. Intel 80486SX processor - front view  Intel 80486SX processor - back view 
The second 80486 processor is DX version of the CPU. The difference of DX processors from SX is that the DX chips have integrated Floating Point Unit. This CPU doesn't have logo or part number, FPO number or any other markings except handwriting. Die of this chip has the same size as SX die - approximately 16mm x 10mm, i.e. 160 mm2. Left side of the die layout on the picture does look different from SX die - this is probably where FPU is located. Intel 80486DX processor - front view  Intel 80486DX processor - back view 
The last 80486 CPU in the kit is a 80486DX2. Front side of the chip doesn't have Intel logo or any other production markings, only handwriting. This CPU has significantly smaller die size - about 84mm2 (7mm x 12mm), or twice as small as the die of 80486DX chip. Intel 80486DX2 processor - front view  Intel 80486DX2 processor - front view 
Pentium microprocessor included in the kit is a Pentium 60. This microprocessor is an early production version with FDIV bug. Intel Pentium processor  
Last modified: 14 Apr 2008
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