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- 4-bit abstract "In computer architecture, 4-bit integers, memory addresses, or other data units are those that are at most 4 bits wide. Also, 4-bit CPU and ALU architectures are those that are based on registers, address buses, or data buses of that size. A group of four bits is also called a nibble.Some of the first microprocessors had a 4-bit word length and were developed around 1970. The TMS 1000, the world's first single-chip microprocessor, was a 4-bit CPU; it had a Harvard architecture, with an on-chip instruction ROM with 8-bit-wide instructions and an on-chip data RAM with 4-bit words. The first commercial microprocessor was the binary coded decimal (BCD-based) Intel 4004, developed for calculator applications in 1971; it had a 4-bit word length, but had 8-bit instructions and 12-bit addresses.The HP Saturn processors, used in many Hewlett-Packard calculators between 1984 and 2015 (including the HP 48 series of scientific calculators) are 4-bit machines; as the Intel 4004 did, they string multiple 4-bit words together, e.g. to form a 20-bit memory address, and most of its registers are 64 bits, storing 16 4-bit digits. Since 2003, new Saturn-based HP calculators (including the HP 49/50 series) utilize a 32-bit processor with an ARM920T core to emulate an extended Saturn processor architecture named Saturn+ at a higher speed.The 4-bit processors were programmed in assembly language because of the extreme size constraint on programs and common programming languages (for microcontrollers, 8-bit and larger), such as C programming language, do not support 4-bit (C requires that the size of the char data type be at least 8 bits, and that that all data types other than bitfields have a size that is a multiple of the character size). While larger than 4-bit values can be used by combining more than one manually, the language has to support the smaller values used in the combining. If not, assembly is the only option.The 1970s saw the emergence of 4-bit software applications for mass markets like pocket calculators.In the 1970s and 1980s a number of research and commercial computers used bit slicing, in which the CPU's arithmetic-logic unit was built from multiple 4-bit-wide sections, each section including a chip such as an Am2901 or 74181 chip.The Zilog Z80, although it is an 8-bit microprocessor, has a 4-bit ALU.".
- 4-bit wikiPageExternalLink saturn.htm.
- 4-bit wikiPageExternalLink considerations-for-4-bit-processing.
- 4-bit wikiPageExternalLink high_4bit.
- 4-bit wikiPageID "520346".
- 4-bit wikiPageLength "11311".
- 4-bit wikiPageOutDegree "59".
- 4-bit wikiPageRevisionID "706432443".
- 4-bit wikiPageWikiLink 74181.
- 4-bit wikiPageWikiLink AMD_Am2900.
- 4-bit wikiPageWikiLink ARM9.
- 4-bit wikiPageWikiLink Arithmetic_logic_unit.
- 4-bit wikiPageWikiLink Assembly_language.
- 4-bit wikiPageWikiLink Atmel.
- 4-bit wikiPageWikiLink BIOS.
- 4-bit wikiPageWikiLink Binary-coded_decimal.
- 4-bit wikiPageWikiLink Binary_number.
- 4-bit wikiPageWikiLink Bit_slicing.
- 4-bit wikiPageWikiLink CIC_(Nintendo).
- 4-bit wikiPageWikiLink C_(programming_language).
- 4-bit wikiPageWikiLink Category:Data_unit.
- 4-bit wikiPageWikiLink Central_processing_unit.
- 4-bit wikiPageWikiLink Character_(computing).
- 4-bit wikiPageWikiLink Coffeemaker.
- 4-bit wikiPageWikiLink Decimal.
- 4-bit wikiPageWikiLink EM_Microelectronic-Marin.
- 4-bit wikiPageWikiLink GMC-4.
- 4-bit wikiPageWikiLink HP_48_series.
- 4-bit wikiPageWikiLink 50_series.
- 4-bit wikiPageWikiLink HP_Saturn.
- 4-bit wikiPageWikiLink Harvard_architecture.
- 4-bit wikiPageWikiLink Hewlett-Packard.
- 4-bit wikiPageWikiLink Hexadecimal.
- 4-bit wikiPageWikiLink Integrated_circuit.
- 4-bit wikiPageWikiLink Intel_4004.
- 4-bit wikiPageWikiLink Intel_4040.
- 4-bit wikiPageWikiLink List_of_microprocessors.
- 4-bit wikiPageWikiLink Low_Pin_Count.
- 4-bit wikiPageWikiLink Microcontroller.
- 4-bit wikiPageWikiLink Microprocessor.
- 4-bit wikiPageWikiLink NEC.
- 4-bit wikiPageWikiLink Nibble.
- 4-bit wikiPageWikiLink Octal.
- 4-bit wikiPageWikiLink Remote_control.
- 4-bit wikiPageWikiLink Renesas_Electronics.
- 4-bit wikiPageWikiLink S1C63.
- 4-bit wikiPageWikiLink Samsung.
- 4-bit wikiPageWikiLink Security_alarm.
- 4-bit wikiPageWikiLink Southbridge_(computing).
- 4-bit wikiPageWikiLink O.
- 4-bit wikiPageWikiLink Toshiba.
- 4-bit wikiPageWikiLink Toshiba_TLCS.
- 4-bit wikiPageWikiLink Unified_Extensible_Firmware_Interface.
- 4-bit wikiPageWikiLink Zilog_Z80.
- 4-bit wikiPageWikiLink ΜPD1724x.
- 4-bit wikiPageWikiLink ΜPD6x.
- 4-bit wikiPageWikiLink ΜPD75X.
- 4-bit wikiPageWikiLinkText "4".
- 4-bit wikiPageWikiLinkText "4-".
- 4-bit wikiPageWikiLinkText "4-bit".
- 4-bit wikiPageWikiLinkText "Four-bit".
- 4-bit date "December 2015".
- 4-bit reason "At least H.P.'s Saturn based processors/SoCs were programmed in FORTH starting with the HP-71B and later in RPL starting starting with HP-18C".
- 4-bit reason "Even if a language doesn't support data types that are the word size of the target architecture one can still access smaller word sizes using bitwise operations.".
- 4-bit reason "These are not "Saturn-based" processors. The "Saturn+" isn't even a Saturn processor, but an emulation of one.".
- 4-bit wikiPageUsesTemplate Template:As_of.
- 4-bit wikiPageUsesTemplate Template:CPU_technologies.
- 4-bit wikiPageUsesTemplate Template:Dubious.
- 4-bit wikiPageUsesTemplate Template:Expand_section.
- 4-bit wikiPageUsesTemplate Template:Main.
- 4-bit wikiPageUsesTemplate Template:N-bit.
- 4-bit wikiPageUsesTemplate Template:Off-topic.
- 4-bit wikiPageUsesTemplate Template:Reflist.
- 4-bit subject Category:Data_unit.
- 4-bit type Redirect.
- 4-bit type Unit.
- 4-bit comment "In computer architecture, 4-bit integers, memory addresses, or other data units are those that are at most 4 bits wide. Also, 4-bit CPU and ALU architectures are those that are based on registers, address buses, or data buses of that size. A group of four bits is also called a nibble.Some of the first microprocessors had a 4-bit word length and were developed around 1970.".
- 4-bit label "4-bit".
- 4-bit sameAs Q229932.
- 4-bit sameAs 4-بت.
- 4-bit sameAs 4_bits.
- 4-bit sameAs 4bitový.
- 4-bit sameAs 4-Bit-Architektur.
- 4-bit sameAs 4_bits.
- 4-bit sameAs ۴-بیت.
- 4-bit sameAs 4_bites_architektúra.
- 4-bit sameAs 4_bit.
- 4-bit sameAs 4ビット.
- 4-bit sameAs 4비트.
- 4-bit sameAs 4-bit.
- 4-bit sameAs Architektura_4-bitowa.
- 4-bit sameAs 4_bits.
- 4-bit sameAs m.02k_1n.
- 4-bit sameAs 4-bit.
- 4-bit sameAs Q229932.
- 4-bit sameAs 4位元.
- 4-bit wasDerivedFrom 4-bit?oldid=706432443.
- 4-bit isPrimaryTopicOf 4-bit.