The AT&T Globalyst 250-P is a Pentium-based laptop that was released in 1995. It was the high-end model of AT&T's 1995 lineup. It was a Pentium version of the Globalyst 250 from the previous year, which used 486 processors.
The 250-P is a rebadged NEC Versa P/75. The color of some case plastics were tweaked to fit AT&T's design language, but it is otherwise identical to an NEC-branded version.
| Spec | Details |
|---|---|
| CPU | CPU Type: Soldered TCP Intel Pentium @75MHz |
| Chipset | Pico Power PT86C868/PT86C718 |
| RAM | Type: Proprietary Standard: 8MB Maximum: 40MB |
| Storage | 2.5" IDE Requires Adapter: Yes Standard: 540 or 810MB |
| Display Options | - 10.4" Active Matrix Color LCD @640x480 - 10.4" Active Matrix Color LCD @800x600 |
| Graphics Chipset | Chips & Technologies 65545 VRAM: 1MB |
| Audio | ESS AudioDrive 688 - Mono Speaker - Microphone |
| Main Battery | NiMH |
| CMOS Battery | - Proprietary Lithium CMOS Battery - NiCad Reserve Battery |
| Power Supply | Proprietary 4-pin - OP-520-4701 AC Adapter |
| Media Drives | Modular Bay supporting the following: - 3.5" 1.44MB Floppy Drive (NEC) - 2nd Battery - Additional 2 PCMCIA Slots - "Video Pak" for watching TV |
| PC Cards | 2x PCMCIA Slots (2x Type II/1x Type III) |
| Networking | None |
| Other I/O | - 1x Parallel - 1x Serial - 1x VGA Out - 1x PS/2 - 1x Dock Connector - 1x Mic In - 1x Line In - 1x Headphone Out |
| BIOS | Phoenix |
| Pointing Device | Trackball |
The plastic parts in these are all brittle with age. This will usually cause hinge mount failure and/or stress cracking, but other fragile case pieces can also fail. You will have to reinforce the hinge area plastics with a bit of epoxy to keep them from exploding.
The 250-P has a NiCad reserve battery located in the top right between the rear I/O and the hard drive bay. This battery can leak and damage components around it, most likely traces and vias around the battery connector, and the rear I/O ports. These don't leak as often as the later NiMH Varta batteries, but they definitely can and will leak, so remove them. The main CMOS battery is a Lithium cell that is very unlikely to leak.
The NiMH Main Battery can also leak.
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