TMS55171 rams equivalent, 262144 by 16-bit multiport video rams.
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The TMS551xx multiport video RAMs (VRAMs) are high-speed dual-ported memory devices. Each consists of a dynamic random-access memory (DRAM) organized as 262 144 words of 16 bits each interfaced to a serial-data register [serial-access memory (SAM)] o.
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