Product Overview
Samsung KM44C256AP-8 Fast Page Mode DRAM - 256K x 4-Bit, 80ns, 20-Pin ZIP, 5V CMOS - Mac SE/30, CPS-1 Compatible
Condition
Unused NOS - New Old Stock. Sourced from legacy electronics supply chains. Evaluation: Visual inspection only. Function testing not performed. Backed by our no-hassle guarantee.
Ships same business day from Idaho. Packed carefully.
Product Overview
Samsung KM44C256AP-8 is a CMOS Fast Page Mode DRAM in a 20-pin ZIP (Zig-zag In-line Package). Density is 256K x 4 bits - 1 megabit total. The "-8" suffix designates 80ns access time. The "A" process designator indicates CMOS construction for reduced power draw versus earlier NMOS variants. Operates on 5V logic. Commonly used in late-1980s and early-1990s systems including Macintosh II series, SE/30, early VGA video cards, and Capcom CPS-1 arcade boards.
Key Features
- Density: 256K x 4 bits (1 Megabit total)
- Access time: 80ns
- Supply voltage: 5V DC
- Package: 20-pin ZIP (Zig-zag In-line Package)
- Process: CMOS (lower power than NMOS)
- Mode: Fast Page Mode
- Refresh: 512 cycles / 8ms
Applications
- RAM replacement or upgrade in Apple Macintosh SE/30, II, IIx, and IIcx logic boards
- Capcom CPS-1 arcade board memory repair
- Early VGA and video card memory restoration
- Legacy 68k Macintosh and retro computing projects requiring ZIP-packaged DRAM
Frequently Asked Questions
Is this a ZIP or DIP package - and does it matter?
This is a 20-pin ZIP (Zig-zag In-line Package). The pins are staggered in two offset rows rather than aligned in two straight parallel rows. ZIP and DIP sockets are not interchangeable. Verify your board or socket type before ordering.
Can this chip replace slower chips rated at 100ns or 120ns?
Yes. An 80ns chip meets or exceeds the timing requirement of systems designed for 100ns or 120ns DRAM. It cannot substitute in systems requiring 60ns or 70ns timings.
How many chips are needed to fill a memory bank?
Most systems using this chip require matched sets of 2, 4, or 8 chips per bank. Consult your logic board documentation or service manual for the exact bank population requirement before ordering a single unit.
Is this compatible with 3.3V systems or modern FPM/EDO RAM slots?
No. This chip requires 5V DC. It is not compatible with 3.3V systems. It is also not interchangeable with standard FPM or EDO modules unless the target system is specifically designed to accept discrete DRAM of this density and package type.
The KM44C256AP-8 has been out of production for decades. Unused stock in this condition is increasingly difficult to source for vintage system restoration and arcade board repair.
