Dual-ported RAM

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Computer memory types
Volatile
RAM
DRAM (e.g., DDR SDRAM) SRAM
In development T-RAM Z-RAM
Historical
Williams–Kilburn tube (1946–47) Delay line memory (1947) Selectron tube (1953) Dekatron
Non-volatile
ROM
Mask ROM PROM EPROM EEPROM
NVRAM
Flash memory
Early stage NVRAM
nvSRAM FeRAM MRAM PRAM
Mechanical
Magnetic tape Hard drive Optical drive
In development
CBRAM SONOS RRAM Racetrack memory NRAM Millipede memory FJG
Historical
Paper data storage (1725) Drum memory (1932) Magnetic-core memory (1949) Plated wire memory (1957) Thin-film memory (1962) Twistor memory (~1968) Bubble memory (~1970)
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Dual-ported RAM (DPRAM) is a type of Random Access Memory that allows multiple reads or writes to occur at the same time, or nearly the same time, unlike single-ported RAM which only allows one access at a time.

Video RAM or VRAM is a common form of dual-ported dynamic RAM mostly used for video memory, allowing the CPU to draw the image at the same time the video hardware is reading it out to the screen.

Apart from VRAM, most other types of dual-ported RAM are based on static RAM technology.

Most CPUs implement the processor registers as a small dual-ported or multi-ported RAM (see Register File).

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