BENTLY 3500/64M動態壓力監測器
標準PC/AT體系結構定義了從0到4GB的內存地址空間和從0到64KB的獨立I/O地址空間。ISA設備VMIVME-7740上的ISA設備在啟動時由BIOS配置，并遵循標準PC/at架構。它們被映射在標準地址內的I/O地址空間中，它們的中斷被映射到標準中斷控制寄存器。然而，除了實時時鐘、鍵盤和可編程計時器之外，所有ISA設備都可以重新定位到標準1K字節I/O地址空間內的任何位置。表E-1定義了可用于ISA設備重新配置的地址范圍。如前所述，在標準PC/AT系統中，所有I/O設備都映射在I/O地址空間中。然而，在VMIVME-7740上，動態隨機存取存儲器（DRAM）、NVRAM和看門狗定時器在存儲器地址空間中尋址。BIOS將DRAM置于地址0，并擴展到板載DRAM的物理極限。
The standard PC/AT architecture defines Memory address space from zero to 4 Gbyte and the separate I/O address space from zero to 64 Kbyte. ISA Devices The ISA devices on the VMIVME-7740 are configured by the BIOS at boot-up and adhere to the standard PC/AT architecture. They are mapped in I/O address space within standard addresses and their interrupts are mapped to standard interrupt control registers. However, all of the ISA devices with the exception of the real-time clock, keyboard, and programmable timer are relocatable to almost anywhere within the standard 1 Kbyte of I/O address space. Table E-1 defines the spectrum of addresses available for reconfiguration of ISA devices. As previously stated, in the standard PC/AT system, all I/O devices are mapped in I/O address space. On the VMIVME-7740, however, the Dynamic Random Access Memory (DRAM), NVRAM, and Watchdog Timer are addressed in Memory address space. The BIOS places DRAM at address zero and extends to the physical limit of the on-board DRAM.
