A modern, command-line compression tool that utilizes multiple CPU cores for incredibly fast ISO-to-CSO conversion.
: Primarily used to save storage space on Memory Sticks. It is a lossless compression of standard
The classic, gold-standard Windows utility for editing and compressing PSP ISOs.
Your PSP must be running Custom Firmware (like PRO-C or LME).
The (available on Windows, macOS, Linux, Android, iOS, and even Xbox) is the gold standard for playing CSO PSP archives. Here’s how to get the best experience:
/PSP Archive /Action God_of_War_Chains_of_Olympus.cso /RPG Persona_3_Portable.cso /Sports FIFA_14.cso
As the PSP's official online store (PlayStation Network) was shut down in 2021, these archives have become even more critical for game preservation. Many digital-only PSP titles and DLCs are no longer available for purchase, making community archives the only remaining copies.
In most countries, downloading a copyrighted PSP game in CSO format is illegal even if you own the UMD, because you are circumventing copy protection. The safe harbor is dumping your own UMDs.
MaxCSO is a modern, highly optimized tool that utilizes multiple CPU cores for fast batch conversions. Download and extract the latest version of maxcso .
To utilize a CSO archive, you need the right software environment, whether playing on original hardware or a modern device. 1. On an Original PSP (PSP 1000, 2000, 3000, or Go)
Building a dedicated archive of CSO files offers several distinct advantages for retro gaming enthusiasts: 1. Maximize Storage Capacity
Once you have 50+ CSO files, managing them becomes a chore. Here is how to scale your archive.
Following many of the titles in our Wind Ensemble catalog, you will see a set of numbers enclosed in square brackets, as in this example:
| Description | Price |
|---|---|
| Rimsky-Korsakov Quintet in Bb [1011-1 w/piano] Item: 26746 |
$28.75 |
The bracketed numbers tell you the precise instrumentation of the ensemble. The first number stands for Flute, the second for Oboe, the third for Clarinet, the fourth for Bassoon, and the fifth (separated from the woodwinds by a dash) is for Horn. Any additional instruments (Piano in this example) are indicated by "w/" (meaning "with") or by using a plus sign.
This woodwind quartet is for 1 Flute, no Oboe, 1 Clarinet, 1 Bassoon, 1 Horn and Piano.
Sometimes there are instruments in the ensemble other than those shown above. These are linked to their respective principal instruments with either a "d" if the same player doubles the instrument, or a "+" if an extra player is required. Whenever this occurs, we will separate the first four digits with commas for clarity. Thus a double reed quartet of 2 oboes, english horn and bassoon will look like this:
Note the "2+1" portion means "2 oboes plus english horn"
Titles with no bracketed numbers are assumed to use "Standard Instrumentation." The following is considered to be Standard Instrumentation:
Following many of the titles in our Brass Ensemble catalog, you will see a set of five numbers enclosed in square brackets, as in this example:
| Description | Price |
|---|---|
| Copland Fanfare for the Common Man [343.01 w/tympani] Item: 02158 |
$14.95 |
The bracketed numbers tell you how many of each instrument are in the ensemble. The first number stands for Trumpet, the second for Horn, the third for Trombone, the fourth (separated from the first three by a dot) for Euphonium and the fifth for Tuba. Any additional instruments (Tympani in this example) are indicated by a "w/" (meaning "with") or by using a plus sign. cso psp archive
Thus, the Copland Fanfare shown above is for 3 Trumpets, 4 Horns, 3 Trombones, no Euphonium, 1 Tuba and Tympani. There is no separate number for Bass Trombone, but it can generally be assumed that if there are multiple Trombone parts, the lowest part can/should be performed on Bass Trombone. Your PSP must be running Custom Firmware (like PRO-C or LME)
Titles listed in our catalog without bracketed numbers are assumed to use "Standard Instrumentation." The following is considered to be Standard Instrumentation: Many digital-only PSP titles and DLCs are no
Following many of the titles in our String Ensemble catalog, you will see a set of four numbers enclosed in square brackets, as in this example:
| Description | Price |
|---|---|
| Atwell Vance's Dance [0220] Item: 32599 |
$8.95 |
These numbers tell you how many of each instrument are in the ensemble. The first number stands for Violin, the second for Viola, the third for Cello, and the fourth for Double Bass. Thus, this string quartet is for 2 Violas and 2 Cellos, rather than the usual 2110. Titles with no bracketed numbers are assumed to use "Standard Instrumentation." The following is considered to be Standard Instrumentation:
A modern, command-line compression tool that utilizes multiple CPU cores for incredibly fast ISO-to-CSO conversion.
: Primarily used to save storage space on Memory Sticks. It is a lossless compression of standard
The classic, gold-standard Windows utility for editing and compressing PSP ISOs.
Your PSP must be running Custom Firmware (like PRO-C or LME).
The (available on Windows, macOS, Linux, Android, iOS, and even Xbox) is the gold standard for playing CSO PSP archives. Here’s how to get the best experience:
/PSP Archive /Action God_of_War_Chains_of_Olympus.cso /RPG Persona_3_Portable.cso /Sports FIFA_14.cso
As the PSP's official online store (PlayStation Network) was shut down in 2021, these archives have become even more critical for game preservation. Many digital-only PSP titles and DLCs are no longer available for purchase, making community archives the only remaining copies.
In most countries, downloading a copyrighted PSP game in CSO format is illegal even if you own the UMD, because you are circumventing copy protection. The safe harbor is dumping your own UMDs.
MaxCSO is a modern, highly optimized tool that utilizes multiple CPU cores for fast batch conversions. Download and extract the latest version of maxcso .
To utilize a CSO archive, you need the right software environment, whether playing on original hardware or a modern device. 1. On an Original PSP (PSP 1000, 2000, 3000, or Go)
Building a dedicated archive of CSO files offers several distinct advantages for retro gaming enthusiasts: 1. Maximize Storage Capacity
Once you have 50+ CSO files, managing them becomes a chore. Here is how to scale your archive.