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Network Working Group                                    John R. PickensRFC # 485                                                UCSBNIC # 15063                                              19 March 1973References NWG/RFC #473                         MIX and MIXAL at UCSBThe following, in response to David Walden's MIX query (RFC#473) waswritten by a graduate student at UCSB.  Questions regarding "cheap"usage should be directed to Roland F. Bryan (RFB) at UCSB.-----------------------------------------------------------------------Mark Scott Johnson18 March 1973I wrote a MIXAL assembler and a MIX simulator last summer.  Theassembler is written in SNOBOL4 and, unfortunately, is fairly expensiveto run.  The assembler has been fairly well debugged and is documented.However, although the MIX simulator is written (in 360 Assembler), ithas only been partially debugged.  Due to the resumption of school andother commitments, I was unable to give the simulator a thoroughdebugging.  All the simulated instructions except I/O instructions havebeen tested somewhat and appear to be operating well.  Also, card readerinput and printer output are operational, but my simulation of diskfiles and magnetic tape has not been completed.  There is presently nodocumentation for the simulator.  Very little documentation is needed,however, since the simulator follows almost to the letter thespecifications detailed in _Fundamental_Algorithms_.    If anyone is interested in using the assembler and/or the simulator,I will be happy to supply what documentation exists plus someinformation on how the programs can be accessed.  Also, if anyone isinterested in the source code for the programs, I will be happy to sendit.  I hope to be able to finish the simulator this next quarter.  Ifanyone wants to use the system and if they should find any bugs, I willdo my best to maintain and correct the programs.       [ This RFC was put into machine readable form for entry ]       [ into the online RFC archives by Alex McKenzie with    ]       [ support from GTE, formerly BBN Corp.             9/99 ]Pickens                                                         [Page 1]