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Dual-ported RAM (DPRAM), also called dual-port RAM, is a type of random-access memory (RAM) that can be accessed via two different buses.. A simple dual-port RAM may allow only read access through one of the ports and write access through the other, in which case the same memory location cannot be accessed simultaneously through the ports since a write operation modifies the data and therefore ...
Dual-ported video RAM (VRAM) is a dual-ported variant of dynamic RAM (DRAM), which was once commonly used to store the framebuffer in graphics adapters.. Dual-ported RAM allows the CPU to read and write data to memory as if it were a conventional DRAM chip, while adding a second port that reads out data.
Dynamic random-access memory (dynamic RAM or DRAM) is a type of random-access semiconductor memory that stores each bit of data in a memory cell, usually consisting of a tiny capacitor and a transistor, both typically based on metal–oxide–semiconductor (MOS) technology. While most DRAM memory cell designs use a capacitor and transistor ...
Am29700/701 Non-Inverting Schottky 64-Bit Random Access Memory (RAM) Am29702/703 Schottky 64-Bit RAM; Am29705 16-Word by 4-Bit 2-Port RAM; Am29707 Multi-Port SRAM; Am29720/721 Low-Power Schottky 256-Bit RAM; Am29750/Am29752 32-Word by 8-Bit Programmable Read-Only Memory (PROM) Am29754/Am29755 256-Word by 4-Bit PROM; Am29770/Am29771 2048-Bit ...
dual-port dRAM controller 48 74F1764: 74x1765 1 dual-port dRAM controller with address latch 48 74F1765: 74x1766 1 burst mode dRAM controller 48 74F1766: 74x1779 1 8-bit bidirectional binary counter three-state 16 74F1779: 74x1801 1 FM, MFM, and DM encoder / decoder, data rates up to 10 MHz 24 74LS1801: 74x1802 1
A pin controlled by the CPU separates this bus into two "ports", a control port and a data port. To write or read a byte of video memory, the CPU first has to write two bytes on the VDP's control port to the VDC's internal address register. Next, the CPU performs the actual write or read on the VDP's data port.
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However, it can open two memory pages at once, which simulates the dual-port nature of other video RAM technologies. The earliest known SGRAM memory are 8 Mbit [ 6 ] chips dating back to 1994: the Hitachi HM5283206, introduced in November 1994, [ 34 ] and the NEC μPD481850, introduced in December 1994. [ 35 ]