✓ VERIFIED

Compaq Presario 425

1993–1994 · all-in-one

Specifications

Cpu: Intel 486SX, 25 MHz
Gpu: Integrated VGA, no add-in slot populated standard
Ram: max: 20 MB via SIMM expansion · base: 4 MB
Ports: Parallel · Serial x2 · PS/2 keyboard · PS/2 mouse · Modem (RJ-11, built-in 14.4k) · Headphone/speaker jack
Display: Built-in 14 inch VGA monitor, integrated into the same enclosure as the system unit
Storage: base: 170 MB hard drive · options: 3.5" 1.44 MB floppy drive (standard)
Os Support: latest: MS-DOS 6.22 / Windows 3.1 (unofficial community reports of Windows 95 running with reduced performance) · shipped: MS-DOS 6.0 with Windows 3.1
Release Price: $1,399

Upgrade paths

RAM

20 MB via the board's SIMM sockets · Case has to come apart to reach the board since the monitor and chassis share one enclosure, more fiddly than a standard desktop of the era.

~$60 for a period 4 MB SIMM

MODERATE

storage

Larger IDE hard drive within period capacity limits (typically 500 MB to 1 GB drives worked) · Standard IDE interface, but physical mounting inside the all-in-one shell is tighter than a tower case.

MODERATE

CPU

Locked to the soldered 486SX at 25 MHz · No socket for a drop-in upgrade; some owners fitted a 487SX/DX overdrive-style chip where a socket existed on later board revisions, but the base 425 board was not consistently upgradeable.

LOCKED

display

Fixed at the built-in 14 inch VGA panel · The monitor is part of the same molded case as the logic board, so there is no external monitor upgrade path without gutting the unit.

LOCKED