📀 Mitsumi CRMC-FX120T

Product Type: Internal CD-ROM Drive (Optical Disc Reader)
Manufacturer: Mitsumi Electric Co., Ltd. (OEM drive widely rebranded by PC makers)
Model Code / FCC ID: EW4CRMC-FX120T

Primary Use: Read-only CD data playback for computers (DOS/Windows era)

⚙️ Core Technical Specifications

📌 Drive Type: Internal IDE / ATAPI CD-ROM Drive (Parallel ATA)
📌 Form Factor: Standard 5.25″ Half-Height internal bay drive

📈 Performance

• Maximum CD Read Speed: 12× — native read speed of approximately 12× CD audio/data transfer rate

  • This corresponds to about ~1,800 KB/s (12× the standard 150 KB/s CD base rate).

🎶 Supported Media (Read-Only)

The drive supports standard CD formats typical of CD-ROM drives of this generation:

• CD-ROM (Mode 1 & Mode 2)

• Audio CD (CD-DA)

• CD-XA

• Video CD

• Photo CD

Unlike later combo drives, this model does not write CDs or read writable CD media beyond basic CD-ROM; it’s a read-only unit.

🧩 Interface & Connectivity

• Interface Standard: ATAPI / IDE (PATA) — 40-pin ribbon cable connector to motherboard IDE channel

• UDMA / DMA Support: Likely supports standard PIO and basic DMA modes typical of era (exact UDMA level not widely documented, but UDMA/33 expected for 12× class).

• Power: Standard 4-pin Molex connector from PSU.

📌 Audio Output

• Some variants include audio line-out pins for analog playback through a sound card/outboard amplifier.

🔌 Master/Slave/Cable Select Jumper Settings

Typical jumper bank (JP1) configurations for ATAPI drives like the CRMC-FX120T:

ConfigurationJP1-1JP1-2JP1-3Master (two-drive)ClosedOpenOpenSlave (two-drive)OpenClosedOpenCable Select (CSEL)OpenOpenClosed

These allow the drive to be configured as Master/Slave or to use Cable Select on the IDE ribbon.

📦 Physical & Installation

• Mounting: Standard internal 5.25″ horizontal/vertical mounting

• Tray: Motorized tray loading mechanism typical of internal CD-ROM drives of the era.

• Weight / Size: Typical optical drive size/weight — ~1 kg, ~146 × 41.5 × 197 mm form factor common in 90’s-era drives. (Exact dimensions are typical for this class; specific manufacturer spec not widely published online.)

💻 Operating System & Compatibility

• Compatible with machines supporting IDE/ATAPI optical drives (DOS, Windows 3.x/95/98/NT, classic Unix/NetBSD/Linux with ATAPI support).

• Driver support: Many systems of the time relied on built-in ATAPI drivers (e.g., MSCDEX/SCSI layer in DOS or generic drivers in Windows).

• No special drivers required beyond standard OS optical drive support, though third-party Mitsumi ATAPI drivers existed for older DOS installs.

🧠 Historical Context

• This drive appears in legacy device lists and compatibility matrices as a 12× ATAPI IDE CD-ROM drive, passing IDE compatibility tests on vintage system boards.

• The CRMC-FX120T was typical of mid-1990s to early-2000s OEM optical drives included in desktops where basic CD data/audio access was needed.

📌 Summary TableFeatureSpecificationModelMitsumi CRMC-FX120TTypeInternal CD-ROM Drive (Read-Only)InterfaceIDE PATA / ATAPIMax Read Speed12×Supported MediaCD-ROM, Audio CD, CD-XA, Video CD, Photo CDForm Factor5.25″ Half-HeightJumper ConfigMaster/Slave/CSEL optionsAudio OutAnalog audio line-out pins presentTypical Era1990s OEM PC systems