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> >> > Can we use any Intel upgrade chip to bring this CPU up.
> >>
> >> I believe the TP750 CPUs, even the CE, are not socketed.
> >
> > I'm pretty sure the 750C's are socketed. They are available as a 50Mhz,
> > or a 75Mhz 486 with the same motherboard. I was told by IBM tech support
> > that the upgrade consisted of replacing a socketed cpu.
>
> Now wait a second. The TP750, 750CS and 750C all use the Intel 486SL/33
> CPU which has been discontinued. Even if it were socketed, I doubt a 486DX
> would fit in its place - the SL has some functions built into it that are
> missing on the DX/SX.
>
> The 750CE uses a 486DX2. As does the 755 series. But the 750CE is an
No. The 755 uses the DX-4.
> earlier incarnation of the 755 (and predates the DX4), so I'm not sure the
> CPU is socketed. The 755 series *is* socketed. At least that's what I was
> told when I asked IBM soon after it was introduced.
Sorry, misprint. I _had_ a 750C, but I replaced it with a 755C. The 755C
has either a DX4-50 or a DX4-75. I purchased the DX4-75 which were rare at
the time. I was originally approached by IBM to purchase the DX4-50 laptop,
and they would just replace the chip with a DX4-75.
This implied to me that the chip is socketed, and that the motherboard
somehow autosenses which chip is socketed. One of the selling points of the
DX-50 laptop was that you could upgrade it someday to a DX4-75 by merely
dropping in a new chip.
| Robert George | Army Research Laboratory |
| robertg@assb01.arl.mil | AMSRL-SS-IC |
| Voice: (408) 656-3316 | 2800 Powder Mill Road |
| Fax: (408) 656-2814 | Adelphi, MD 20783-1197 |
A designer knows when he has achieved perfection not when there is
nothing left to add, but when there is nothing left to take away.
-- Antoine de Saint-Exupery