Hardware Toshiba Satellite 4025CDT

Toshiba Satellite 4025CDT

Laptop

A Pentium II laptop from the late 1990s. It still starts up in real mode like an 8086, so os8088 boots on it as it does on the 5150 -- and its screen has 2.56 times as many pixels as VGA's 640x480.

Get boot images How VESA.DRV works

os8088 on real hardware

Toshiba Satellite 4025CDT
An open grey Toshiba Satellite 4025CDT laptop on a cluttered desk, badged Intel Inside Pentium II and Powered by Red Hat under its screen, with three green lights lit along its front edge. The LCD shows the os8088 desktop on a blue gradient: a Control Panel on its Display page, an Apps window listing drive C:, a Note Pad, a Sheet, and a Paint window with a squiggle drawn in it.
A Toshiba Satellite 4025CDT running os8088 with Nullmoment's VBE driver. Photos by Nullmoment, shared on Discord.

See it running

View all photos & details
4025CDT, Paint
The Toshiba's LCD filling the frame. A Control Panel on its Display page lists Vga 640x480, Cga 640x200 and Vbe 1024x768, with Vbe selected, a Set Primary button, and the line Switches now, and is kept. An Apps window reads Drive C: 26 files and lists MIDIRACK, NOTEPAD, PAINT, PIANO, RECORDER, REDLINE, SHEET and TELNET, with Free 1515.31M at the bottom. A Note Pad reads Hello, 1024x768 :), a Sheet window is open on SHEET1.SLK, and in front a Paint window holds a brown squiggle above a row of color swatches.
4025CDT, Paint
4025CDT, screen
The Toshiba's screen with the top of its keyboard and its Toshiba, Intel Inside Pentium II and Red Hat badges below it. The menu bar reads Locator, File, Edit, Nav and Builtins. A Control Panel shows the Display page with Vbe 1024x768 selected, an Apps window lists HELLO, MACRO.OVL, MIDIRACK and its bank and graphics files, NOTEPAD, PAINT and PIANO, and a Sheet window titled SHEET1.SLK shows an empty grid of columns A to I and rows 1 to 20.
4025CDT, screen
CPU
Pentium II
mode
VBE, 1024 x 768
hard disk
C:, 1515MB free

Manuals & resources

All sources & references

Running os8088?

Share photos of your setup with the community. Open a GitHub issue and attach your images.

Submit your photos on GitHub

History, photos & source references

The mode is set through the card's own BIOS

A VBE driver by Nullmoment, ahead of the one in the release.

Here the screen is filled by a VBE driver Nullmoment wrote, which sets the mode through the video card's VESA BIOS. The Control Panel's Display page lists it beside VGA and CGA; Set Primary switches to it at once and keeps it for the next boot. That driver is not in the main os8088 tree; since v1.0.20261025 the release images reach 1024x768 with their own, VESA.DRV.

4025CDT, Paint
The Toshiba's LCD filling the frame. A Control Panel on its Display page lists Vga 640x480, Cga 640x200 and Vbe 1024x768, with Vbe selected, a Set Primary button, and the line Switches now, and is kept. An Apps window reads Drive C: 26 files and lists MIDIRACK, NOTEPAD, PAINT, PIANO, RECORDER, REDLINE, SHEET and TELNET, with Free 1515.31M at the bottom. A Note Pad reads Hello, 1024x768 :), a Sheet window is open on SHEET1.SLK, and in front a Paint window holds a brown squiggle above a row of color swatches.
The screen close up, with five programs open and room left over. The Note Pad reads Hello, 1024x768 :).
4025CDT, screen
The Toshiba's screen with the top of its keyboard and its Toshiba, Intel Inside Pentium II and Red Hat badges below it. The menu bar reads Locator, File, Edit, Nav and Builtins. A Control Panel shows the Display page with Vbe 1024x768 selected, an Apps window lists HELLO, MACRO.OVL, MIDIRACK and its bank and graphics files, NOTEPAD, PAINT and PIANO, and a Sheet window titled SHEET1.SLK shows an empty grid of columns A to I and rows 1 to 20.
Five minutes earlier in the same session: the Control Panel set to VBE, the Apps window on drive C:, and an empty Sheet.

The 4020CDT under a second part number

What the VESA BIOS belongs to, and how far its 2MB goes.

Toshiba's sheets describe one machine twice. The 4025CDT specification and the 4020CDT's agree on processor, memory, screen and disk, and part at the order number and at the software in the box: the 4025CDT has Microsoft Money 98, Quicken Basic 98 and Disney's Daily Blast where the 4020CDT has Prodigy Internet and Norton AntiVirus. Neither sheet says why there were two. DOS Days has the 4020CDT at $2,499 in January 1999, $600 above the 266MHz 4010CDT.

The pair topped the first Satellite 4000 family, which opened in September 1998 at 233MHz with a 12.1-inch, 800 x 600 panel. The graphics chip came from Chips and Technologies, whose datasheet of September 1997 lists VESA VBE 2.0 among the functions of its video BIOS. Its memory is the limit: at the panel's full resolution the chip shows 65,536 colors and no more (the 16.7 million on Toshiba's sheet is for 800 x 600 and below). The 4030CDT that followed in February 1999 dropped to a Celeron and changed to a Trident Cyber 9525 with 2.5MB.

Hard disk, floppy drive and CD-ROM are all inside at once, in a case 2.13 inches thick. The sound chip is a Yamaha OPL3-SA3, which Toshiba lists as Sound Blaster Pro compatible. There is no modem on the board; Toshiba bundled a 3Com 56K PC Card. The lithium-ion pack was rated for two and a half hours.

processor
Mobile Pentium II, 300MHz
memory
64MB, to 160MB
display
13.3-inch TFT
graphics
C&T 65555, 2MB
CD-ROM
24-speed
weight
7.0lb

Sources

All machines