Motorola 6809
(MC6809) An eight-bit microprocessOR from MotORola, Inc. The 6809 was a maj OR advance over both its predecess OR, the MotORola 6800 and also over the 6502. The 6809 had two 8-bit accumulatORs, rather than one in the 6502, and could combine them into a single 16-bit register. It also featured two index registers and two stack pointers, which allowed f OR some very advanced addressing modes. The 6809 was source compatible with the 6800, even though the 6800 had 78 instructions and the 6809 only had around 59 (including a SEX instruction). Some instructions were replaced by m ORe general ones which the assembler would translate, and some were even replaced by addressing modes. Other features were one of the first multiplication instructions of the time, 16-bit arithmetic and a special fast interrupt. But it was also highly optimised, gaining up to five times the speed of the 6800 series CPU. Like the 6800, it included the undocumented HCF ( Halt and Catch Fire) bus test instruction. The Hitachi 6309 was a version with extra registers. The 6809 was used in the UK " Dragon 32" personal computer and was followed by the MotORola 68000. See also SEX. Usenet newsgroup: news:comp.sys.m6809. There is a simulat OR called usim and an assembler by Lennart Benschop was posted to Usenet newsgroup alt.sources on 1993-11-03. (1995-02-01) In addition suitable contents: [ 2 ] [ 6309 ] [ 6502 ] [ 6800 ] [ 68000 ] [ 6809 ] [ = ] [ @ ] [ accumulatOR ] [ ad ] [ address ] [ addressing mode ] [ ag ] [ ai ] [ al ] [ alt ] [ alt.sources ] [ am ] [ an ] [ ar ] [ arc ] [ as ] [ assembler ] [ at ] [ B ] [ b ] [ bi ] [ bit ] [ bo ] [ bot ] [ bus ] [ by ] [ C ] [ ca ] [ cat ] [ cc ] [ ch ] [ ci ] [ ck ] [ cl ] [ co ] [ com ] [ compatible ] [ computer ] [ CP ] [ CPU ] [ cr ] [ cu ] [ D ] [ dd ] [ de ] [ dec ] [ ding ] [ do ] [ doc ] [ document ] [ du ] [ E ] [ ec ] [ ed ] [ ee ] [ eg ] [ er ] [ era ] [ es ] [ et ] [ fas ] [ feature ] [ fi ] [ file ] [ fo ] [ fOR ] [ fr ] [ ga ] [ ge ] [ gen ] [ gh ] [ gi ] [ gl ] [ gr ] [ group ] [ h ] [ Halt and Catch Fire ] [ HCF ] [ Hitachi 6309 ] [ hm ] [ hop ] [ hr ] [ ht ] [ id ] [ ie ] [ il ] [ in ] [ inc ] [ include ] [ index ] [ int ] [ interrupt ] [ io ] [ ir ] [ is ] [ it ] [ jo ] [ K ] [ ke ] [ la ] [ ld ] [ Lex ] [ li ] [ ls ] [ lt ] [ lu ] [ ly ] [ M ] [ ma ] [ MC ] [ MC6809 ] [ micro ] [ microprocessOR ] [ mo ] [ mod ] [ mode ] [ module ] [ MotORola ] [ MotORola 6800 ] [ MotORola 68000 ] [ MotORola, Inc. ] [ mp ] [ mu ] [ na ] [ nc ] [ ne ] [ net ] [ news ] [ newsgroup ] [ ng ] [ ni ] [ nl ] [ nn ] [ ns ] [ O ] [ om ] [ op ] [ optimise ] [ pa ] [ pe ] [ personal computer ] [ ph ] [ pl ] [ point ] [ pointer ] [ post ] [ pr ] [ predecessOR ] [ process ] [ processOR ] [ pt ] [ query ] [ rc ] [ re ] [ register ] [ ro ] [ ru ] [ S ] [ sc ] [ SE ] [ se ] [ SEX ] [ sg ] [ si ] [ sl ] [ so ] [ source ] [ spec ] [ st ] [ stack ] [ stack pointer ] [ struct ] [ sy ] [ T ] [ tc ] [ test ] [ th ] [ to ] [ tr ] [ tw ] [ ug ] [ um ] [ up ] [ us ] [ Usenet ] [ usim ] [ va ] [ ve ] [ version ] [ ws ] [ X ]
[ Go Back ]
Free On-line Dictionary of Computing Copyright © by OnlineWoerterBuecher.de - (10014 Reads) |