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Chip Numbers, Acronyms and Things: Difference between revisions

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Chip Numbers, Acronyms and Things (view source)

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;Expanded Memory:Memory used by an EMS driver. Located beyond 1mb mark.
;Extended Memory:Memory used by an XMS driver. Located beyond the 1mb mark. The first 64kb of XMS is known as HMA (High Memory Area).
;Fault:An exception that is recognisedrecognized by the processor before the CPU executes the code. eg: trying to access memory swapped out to disk triggers a fault BEFORE the memory is accessed so it can be swapped into memory.
;FDC:Floppy Disk Controller
;FIFO:First In First Out. FIFO buffers are common in newer UART chips for communications (16550AFN)
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;PD765:The floppy controller chip in the XT
;Multitasking:Where the CPU 'appears' to be running several tasks all at the same time.
;Nibble,Nybble:Group of 4 bits. Half a byte... Quarter a word... EigthEighth of a dword... etc..▼
;Multitasking OS:The difference between unix and dos :> joke! see Multitasking. good examples of MOS and nonMOS are unix to dos, vms to cpm, etc.
▲;Nibble,Nybble:Group of 4 bits. Half a byte... Quarter a word... Eigth of a dword... etc..
;NMI:Non Maskable Interrupt. An interrupt request sent to the CPU that must be dealt with immediately.
;Page:Section of memory that is classed as a single entity. eg: x86 in pmode has pages of 1byte, 4kb and 4mb in size.
;Page Directory:Holds the entries for the paging table mechanism. Unlike Page Tables, the Page Directory can't be swapped out of memory.
;PCI:Peripheral Component Interconnect. A Local Bus standard running at 32bits at 33mhz (can go higher). PCI has replaced ISA as the most common bus interface for desktopishdesktop computers.
;PCMCIA:Personal Computer Memory Card International Association. Small credit card sized units that plug into portable computer PCMCIA slot and provide things like extra memory, modems, etc.
;PIC:Programmable Interrupt Controller. The PIC manages hardware interrupts.
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