dagln@msa3b.UUCP (David Anglin) (05/07/91)
Does anyone know if the PS/2 Model 70-B21 is a TRUE 486 machine, or is it the PS/2 70-A21 with the "special" 486 upgrade card. I know, what do I mean by TRUE. Was the PS/2 Model 70-B21 built specifically for the 486 chip.
U39648@uicvm.uic.edu (From The Mind Of) (05/08/91)
>Does anyone know if the PS/2 Model 70-B21 is a TRUE 486 machine, or is it the >PS/2 70-A21 with the "special" 486 upgrade card. I know, what do I mean by >TRUE. Was the PS/2 Model 70-B21 built specifically for the 486 chip. Ok, your answers are yes, it is a true 486 machine, and yes, it's a 70-A21 with an upgrade card. The PS/2 Model 70-A61/A21 (60M/120M) was designed to use a 32-bit 25MHz Intel CPU. It comes with a processor platform containing a 25MHz 386 and a 64K static RAM cache. It was designed originally to be able to replace the CPU platform with (the then unavailable) 25MHz 486. This was not an afterthought. So, a 70-A21 that has a 486 processor platform installed is the exact same machine as a 70-B21. When you buy a 486 processor platform from IBM, they actually take back the original 386 processor platform, leaving no trace of the humble origins inside the box... but model/serial numbers never lie. - Darius ========================================================================= BITNET: U39648@UICVM | "I'd rather laugh with the sinners Internet: u39648@uicvm.uic.edu | than cry with the saints, ====================================| the sinners are much more fun, "Don't set fire to strangers." | and only the good die young." - Mr. Zarniwoop | - Billy Joel