Jan 10, 2025 · Port I/O: The VGA needs 8-bit read/writes, and 16-bit writes. MMIO: The VGA uses uncached byte accesses to 0xA0000-0xBFFFF. In several cases, larger writes are also allowed.

Oct 2, 2020 · An I/O port is usually used as a technical term for a specific address on the x86's IO bus. This bus provides communication with devices in a fixed order and size, and was used as …

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This index lists the VGA's I/O ports in numerical order, making looking up a specific I/O port access simpler. 3B4h -- CRTC Controller Address Register; 3B5h -- CRTC Controller Data …

The following table lists ports and indexes for the VGA without providing full details. Since the VGA uses the same port range as the EGA, you may refer to EGA I/O Ports and CGA I/O …

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The first group contains all PC-AT hardware, devices like timers, interrupt controllers, PS/2 ports, serial and parallel port, floppy and disk drive, and the VGA. Back in the old days devices were …