MT42C4256 dram equivalent, 256k x 4 vram 256k x 4 dram.
* Class B High-Reliability Processing
* DRAM: 262144 Words × 4 Bits SAM: 512 Words × 4 Bits
* Single 5-V Power Supply (±10% Tolerance)
* Dual Port Accessi.
not requiring real-time register reload (for example, reloads done during CRT retrace periods), the single-register mode.
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