Glossary H

HAL = Hardware Abstraction Layer (Microsoft Direct3D virtual 3D video accelerator interface APIs).
Half-Duplex = One way modem communication protocol (simplex or local-echo).
HAVi = Home Audio Video interoperability (entertainment APIs).
HD (1) = Hard Disk (Drive).
HD (2) = High Definition.
HDA = High reliability Hard Disk Assembly.
HD Audio = High Definition Audio (Intel).
HD-BURN = 1.4 GB CD-R/CD-RW technology (Sanyo).
HDC = Hard Disk Controller.
HDD = Hard Disk Drive.
HD-DVD = High Definition Digital Versatile Disk standard (Toshiba/NEC/Sanyo/Memory-Tech).
HD-ROM = High Definition Read Only Media (Norsam Technology).
HD-SDI = High Definition Serial Digital Interface.
HDSL = High bit rate Digital Subscriber Line modem standard.
HDSS = Holographic Data Storage System (IBM).
HDTV = High Definition TeleVision (new digital TV standard: 1200 lines).
HDVD = High Definition Digital Video Disk (Sonic/Ravisent).
HDVP = High Definition Video Processor (NVidia GeForce2/3/4/FX 3D video chipsets).
HEL = Hardware Emulation Layer (Microsoft Direct3D virtual 3D video rasterization device).
HFC = Hybrid Fiber Coaxial cable system.
HFS = Hierarchical File System (MacOS CD-ROM).
HGL = Hewlett Packard Graphics Language image file.
HID = Human Interface Devices (computer peripherals).
HiFD = High density 200 MB Floppy Disk Drive standard (Sony/Fuji).
Hi-Fi = High Fidelity (audio/video standard).
HIMEM = Microsoft HIgh/Extended MEMory Manager (HIMEM.SYS).
HIPPI = HIgh Performance Parallel Interface (ANSI X3T9.3 standard).
HLSL = High Level Shader Language (Microsoft DirectX 9 programming).
HMA = High Memory Area.
HP = Hewlett Packard Corporation.
HPC = Handheld Personal Computer.
HPFS = High Performance File System (OS/2).
HSDRAM = High Speed Synchronous Dynamic Random Access Memory.
HSF = Heat Sink and Fan combo (computer components cooling).
HSI = High Speed Interconnect (CERN).
HSR = Hidden Surface Removal 3D polygon rendering (NVidia GeForce2 and newer + 3dfx Voodoo5/6 3D video).
HTML = HyperText Markup Language (W3C).
HTPC = Home Theater Personal Computer.
HTTP = HyperText Transfer Protocol.
HTTPS = HyperText Transfer Protocol Secure (SSL + TLS standards).
HVD (1) = High Voltage Differential standard (SCSI-2).
HVD (2) = Holographic Versatile Disk 1 TB (Optware).
HyperTransport = I/O bus architecture: 64-bit, 133/266 MHz, 6.4 GB/sec (AMD).
Hz = Hertz (clock speed). 1 Hz = 1 clock cycle.