Micron MT4C4M4B1DJ-6 4MB 30-Pin SIMM 4Mx9 60ns Parity FPM RAM Memory Module

Micron MT4C4M4B1DJ-6 4MB 30-Pin SIMM 4Mx9 60ns Parity FPM RAM Memory Module

The Micron MT4C4M4B1DJ-6 is a 4MB, 30-pin SIMM (Single Inline Memory Module) built to the 4Mx9 organization — meaning 4 million address locations at 9 bits wide, giving it both full 4MB capacity and parity error detection. It operates at 60ns access time using Fast Page Mode (FPM) DRAM technology and runs on standard 5V logic. Assembled in the United States, this module is marked POWMEM on the PCB with a 94V-0 flame rating and a 1996 date code (9631).

Specifications & What's Included

• Part Number: MT4C4M4B1DJ-6
• Manufacturer: Micron Technology
• Capacity: 4MB
• Organization: 4Mx9 (parity)
• Speed: 60ns
• Memory Type: FPM DRAM (Fast Page Mode)
• Parity: Yes (9-bit)
• Form Factor: 30-Pin SIMM
• Voltage: 5V
• PCB: Green, assembled in the U.S.A.; UL 94V-0 rated
• Date Code: 9631 (week 31, 1996)
• Included: Single 30-pin SIMM module only — no packaging or documentation

Applications

30-pin SIMMs were the standard system memory format for desktop PCs from the mid-1980s through the early 1990s, used in 286, 386, and 486 platforms as well as early Pentium systems that retained 30-pin sockets. Many motherboards of this era required SIMMs to be installed in matched banks of two or four for the memory controller to recognize them, which is why this 4MB module is often paired with others. Apple Macintosh systems — including the Mac II series, the LC, and the Quadra line — also relied heavily on 30-pin SIMMs, as did many Sun, HP, and other UNIX workstations of the era. By the mid-1990s, 30-pin SIMMs were being replaced by 72-pin SIMMs and later DIMMs, making this module a legacy component primarily sought today for vintage system restoration, retro computing, and period-correct upgrades. The 60ns speed and parity (9-bit) configuration make this module compatible with parity-checking motherboards that require error-detection memory.