MIX and MIXAL at UCSB

The following, in response to David Walden's MIX query (RFC#473) was

written by a graduate student at UCSB. Questions regarding "cheap"

usage should be directed to Roland F. Bryan (RFB) at UCSB.

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Mark Scott Johnson

18 March 1973

I wrote a MIXAL assembler and a MIX simulator last summer. The

assembler is written in SNOBOL4 and, unfortunately, is fairly expensive

to run. The assembler has been fairly well debugged and is documented.

However, although the MIX simulator is written (in 360 Assembler), it

has only been partially debugged. Due to the resumption of school and

other commitments, I was unable to give the simulator a thorough

debugging. All the simulated instructions except I/O instructions have

been tested somewhat and appear to be operating well. Also, card reader

input and printer output are operational, but my simulation of disk

files and magnetic tape has not been completed. There is presently no

documentation for the simulator. Very little documentation is needed,

however, since the simulator follows almost to the letter the

specifications 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 some

information on how the programs can be accessed. Also, if anyone is

interested in the source code for the programs, I will be happy to send

it. I hope to be able to finish the simulator this next quarter. If

anyone wants to use the system and if they should find any bugs, I will

do 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 ]

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