Dpr Roms -

A dual-port memory chip has two independent address/data buses. Two different processors (or one processor and a DMA controller) can read from or write to the same memory location at the same time without contention or wait states.

1. Introduction In the world of vintage arcade boards (e.g., Capcom CPS-2, CPS-3, Sega System 32) and classic computers, you will occasionally encounter the term DPR ROM . It is not a distinct "type" of ROM chip like EPROM or Mask ROM, but rather a functional description: Dual-Ported RAM used in a read-only manner or a hybrid component that allows two independent systems to access the same memory simultaneously. dpr roms

// Dual-port ROM region region("dpram", 0x20000) .rom("game_dpr.bin") .share("shared_gfx"); // CPU 1 maps it at 0x400000 cpu1->map(0x400000, 0x41ffff).ram().share("shared_gfx").readonly(); A dual-port memory chip has two independent address/data