Mk4096
The MK4096 was Mostek's 4-kilobit dynamic RAM, a landmark memory chip of the mid-1970s whose use of address multiplexing in a compact 16-pin package established conventions that DRAMs would follow for years. As a product it is remembered for a specific packaging and interface achievement rather than for its raw 4,096-bit capacity, because that capacity was simply the generation's expected step while the way the chip handled its addressing was genuinely influential. The MK4096 is the concrete artifact through which address multiplexing entered mainstream memory design.
The MK4096's signature feature was fitting a 4-kilobit memory into a small package by multiplexing its address pins, which directly lowered system cost. Addressing 4,096 locations would ordinarily require enough address lines to cover all of them at once, pushing up pin count and package size. The MK4096 instead accepted the row portion of the address and then the column portion over the same pins in two steps, timed by control signals, so a much smaller pin count sufficed. The result was a compact, inexpensive package, and because package and pin costs are a real part of a chip's total cost, this translated into a cheaper memory for the systems that used it.
The row-and-column addressing model the MK4096 popularized became the deep structure of how DRAMs are organized and spoken to, outlasting the chip by a wide margin. Splitting an address into a row part and a column part, each latched by its own control strobe, is not just a pin-saving trick; it maps onto the physical layout of a memory array as a grid of rows and columns, and it became the conceptual and electrical framework that subsequent DRAM generations elaborated rather than replaced. Later memories grew vastly larger and faster while retaining this basic row/column, two-step addressing lineage, which is why the MK4096 is cited as a foundational part.
The MK4096 is also the product that carried Mostek to prominence, tying a company's fortunes to a single well-executed design. Its combination of the multiplexed-addressing advantage and solid manufacturing helped Mostek take major DRAM market share and briefly become a memory leader. This illustrates how, in commodity semiconductors, a single part that gets the cost-relevant details right can define a company's position for a period — the MK4096 was not just a chip but the basis of a business, until competitors matched the approach and the broader market dynamics shifted.
Understanding the MK4096 is a good way to see that memory innovation is often about interface and economics, not only about shrinking the storage cell. The headline number of a memory generation is its bit capacity, but the MK4096's lasting mark came from how it connected to the rest of the system. That emphasis — solving the pin, package, and addressing problem elegantly — is a recurring theme in memory history and a reminder that the boundary between a chip and its system is where a great deal of practical engineering value is created.
Read the MK4096 as the chip that made address multiplexing standard: Mostek's 4-kilobit DRAM whose two-step row-and-column addressing fit a memory into a small cheap package and set the addressing framework that DRAMs carried forward for generations.