The 1994 launch of the original Sony PlayStation helped reshape the gaming landscape, shipping with a total of 2MB of system RAM distributed across four 512KB chips on the motherboard. While that allocation capably powered landmark titles including Resident Evil, Final Fantasy VII, and Metal Gear Solid, a long-dormant design choice has now come to light: Sony engineers built the console with the latent capacity to address up to 16MB of RAM.
A Feature Rescued From Arcade Hardware
This expanded memory support, originally incorporated for Sony’s arcade platform but never activated in retail home consoles, remained an unused capability for decades. Today, a group of dedicated modders has succeeded in unlocking that dormant potential, retrofitting vintage PlayStation units to utilise the full 16MB of addressable RAM.
In a recent demonstration, Tito Perez of the Macho Nacho Productions channel documented the upgrade process on his own console. “Can you really upgrade the original PlayStation from just 2MB of RAM to 16MB of RAM?” Perez asks in the video, before walking viewers through the installation of a 16MB memory modification. The procedure relies on newly designed board traces created by modder TunerTom and involves methodical testing of retail game compatibility as well as an exploration of what the expanded memory could enable on original hardware.
Refining an Established Modification Path
The work builds on earlier community projects that had pushed PS1 RAM up to 8MB, long regarded as the practical ceiling. By analysing Sony’s arcade boards—which operated with two distinct 8MB memory banks—TunerTom, in collaboration with the PSX.Dev Discord community, mapped a route to bring that full dual-bank architecture to consumer consoles.
Performing the upgrade is a delicate engineering task. It begins with the removal of the four factory-installed 512KB chips, which are then superseded by eight 2MB EDO RAM chips harvested from obsolete PC memory modules. Four of those chips occupy the standard positions on the board, while the remaining four are carefully stacked and soldered into place.
Installation and Current Compatibility
A custom quick-solder QSB board reroutes the necessary signals, a process that requires precise trace-cutting, meticulous wiring, and the addition of a resistor to properly manage the two 8MB RAM banks. Once fitted, the entire modification remains concealed beneath the console’s RF shields, with only the new wiring visible. The procedure is compatible with nearly all PlayStation revisions, though SCPH-5500 models equipped with PU-8 motherboards are particularly well suited.
In everyday use, results are mixed: some original retail games boot and run without issue, while others encounter startup problems caused by the reconfigured memory layout. The more significant long-term promise lies with the homebrew development community, which is expected to harness the full 16MB for porting classic titles and applying ambitious visual overhaul patches—such as improving level-of-detail scaling—to original PS1 software. One already demonstrated proof of concept is a version of Super Mario 64 that can be loaded and executed entirely from the console’s newly available 16MB of RAM.
Source: youtu.be