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           A FORTRAN IV - Machine Language Interface Package

                            June 1972 (v.2)

                          Author: Ken Shoemake




    Conventions Used in this Document:

         In order to  facilitate  the  description  of  the  various
    routines  added  to the FORTRAN library certain conventions have
    been adopted.  First, the format of the individual  descriptions
    is:
           Result = FUNCTION(argument1,argument2,...)
    immediately followed by an explanation of the function  and  the
    various  arguments.   All  of  the  routines  return  a  result,
    although in many cases no result is  meaningful  so  a  zero  is
    returned.   Routines  that return such a result are indicated by
    an  asterisk  -  "*"  preceding  the   result.    FORTRAN   type
    conventions  have  not  been  followed  in  the  naming of these
    routines  so  an  "IMPLICIT  INTEGER"  or   "INTEGER   Function"
    statement  is  usually necessary to avoid type conversion of the
    results.  If the identifier on the  left  side  of  the  "="  is
    "Intger"   then   the   function   returns  an  INTEGER  result.
    Similarly, "Logic" indicates a result  of  type  "LOGICAL".   In
    practice,  these two types may be interchanged, since the PDP-10
    FORTRAN IV compiler allows arithmetic and logical operations  to
    be performed on both types.  The constant ".TRUE." is defined to
    be -1 and ".FALSE." is defined to be 0.  The identifier "Cmplex"
    means  that  the  function returns a two word result.  It is not
    meant to imply anything about the type of the result,  which  is
    ordinarily INTEGER.  To access the second word of the result the
    routine should be declared COMPLEX and the results assigned to a
    COMPLEX variable.  The second word will then be contained in the
    IMAGinary part of the variable.  For IMP programmers, the second
    word  is  returned in register 1.  "Value" means the result is a
    single word of arbitrary type.

         The function names are intended to be mnemonic, and in  the
    case  of  the UUO's, the routines do generally the same thing as
    their MACRO equivalents.   This  implies  that  if  one  doesn't
        understand what a function is supposed to do, one should consult
    the  reference  manual  before   complaining   to   the   humble
    documentor.   This applies to the arguments especially, since no
    great attempt  has  been  made  to  explain  any  more  than  is
    necessary given a familiarity with the relevant machine function
    (due to obvious spatial  limitations).   Again,  mnemonic  names
    have  been  used,  as  well as certain other conventions.  These
    conventions are subject to modification if suitable complaint is
    made,  but  at  present  they are as follows.  Arguments are not
    checked for type by the routines so typing is left to programmer
    discretion.   Array arguments are indicated by "array[n]", where
    "n" is meant to be the size of the array.   Brackets  around  an
    argument,  i.e.   "[address]",  mean  that  the  contents of the
    argument are used to specify an address, rather than  using  the
    address  of  the argument itself.  This form is only found where
    the latter interpretation would usually be  assumed.   Arguments
    in  single quotes, i.e.  'DEVICE', indicate that an ASCII string
    is appropriate for the argument.  Usually the string  should  be
    terminated  with a null character (FORTRAN does this for you for
    literals, but you may get up to 4 extra blanks on the end).  Two
    arguments  separated  by  a  "/" are alternate choices, in other
    words, you may use either form.  A zero means that the  argument
    to  the  function  is  ignored.   The  last, but most important,
    convention is that arguments in parentheses (excluding the usual
    ones,  of course) are optional and may be omitted.  For example,
    "FUNC(a,(b,c))" means that "a" must be specified but "b" and "c"
    are  not  necessary (usually default values are assumed).  If it
    is necessary to specify "c", then "b" must  also  be  specified,
    however "b" can be used without "c".

         The  following  routines  are  included  in  the  available
    functions:

Intger = LOC(variable)

    Returns the location of the named variable

Value  = CON([address])

    Returns the contents of the specified address

*Value = SETWRD(value,[address])

    Puts value in the specified address

Intger = LSH(intvar,iamnt)

    Returns intvar logically shifted (to the left) by iamnt

Intger = RSH(intvar,iamnt)

    Returns intvar logically shifted (to the right) by iamnt

Intger = ROT(intvar,iamnt)

    Returns intvar rotated (to the left) by iamnt

*value = SETCOR(first,last,(value))

    Sets consecutive core locations to value or 0; returns value or 0

*0     = SAVREG(array[16])

    Saves all the registers in array; returns 0

*array = RSTREG(array[16])

    Restores all the registers from array; returns array[1]

Intger = ARGCNT(0)

    Returns the number of arguments the calling routine was

    called with; undefined for a main program

Value  = ARGREF(n)

    Returns the address of the n'th argument (1st arg. is n=1)

    of the calling routine; undefined for a main program

Cmplex = CALLI(n/'FUNCT',(iac/value,value2))

    Returns the result of the indicated CALLI;  uses 2nd argument

    as Ac number if appropriate; value2 goes into Ac+1

Logic  = NOSKIP(0)

    Returns .TRUE. if the last call to CALLI resulted in a no-skip

    return, returns .FALSE. otherwise

Value  = CODE(lefthalf,address)

    Executes the instruction formed by using lefthalf as the left

    half-word and address for the right half-word

Intger = POINT(size,address,(position))

    Returns a byte pointer to a byte of size bits in address;

    if position is given then it specifies the position of

    the right-most bit of the byte (bit 0 is the left-most

    bit of the word), otherwise -1 is used (this gives the

    proper pointer for an ILDB or IDPB to get the first byte)

Intger = SIXBIT('ASCIZ')

    Returns 'ASCIZ' (6 characters or less) converted to sixbit

Cmplex = ASCII(SIXBIT)

    Returns SIXBIT converted to ASCIZ

Intger = RAD50('ASCIZ',(bits))

    Returns the value of 'ASCIZ' as a radix 50 symbol with bits as

    the 4 code bits

Intger = RADX50(SIXBIT,(bits))

    Returns the value of SIXBIT as a radix 50 symbol with bits as the

    four code bits

Cmplex = ASCI50(RADI50,bits)

    Returns the RADIX-50 symbol in RADI50 converted to ASCII and sets

    bits to the code bits in the symbol

Intger = SIX50(RADI50,bits)

    Returns the RADIX-50 symbol in RADI50 converted to SIXBIT and sets

    bits to the code bits in the symbol

Intger = ILDB(pointr)

    Returns the result of an ILDB instruction using the given pointer

*byte  = IDPB(byte,pointr)

    Performs an IDPB instruction to deposit the given byte using the

    given pointer; returns the given byte

*pointr= IBP(pointr)

    Increments the given byte pointer; returns the incremented pointer

Intger = LDB(pointr)

    Returns the byte pointed to by the given pointer

*byte  = DPB(byte,pointr)

    Deposits the given byte in the position pointed to by the given

    pointer

Logic  = OPEN(channel,array[3])

    Performs the OPEN uuo with the address of array as the effective

    address; returns 0 if no error, -1 otherwise

Logic  = INIT(channel,status,('DEVICE',obuf/'0',ibuf/'0'))

    Performs the INIT uuo with the specified information.  'DSK' is

    the default device and if obuf or ibuf contains a left-justified

    ASCII '0', the corresponding buffer is omitted in the call.

*0     = INBUF(channel,n)

    Performs the INBUF uuo with the specified information; returns 0

*0     = OUTBUF(channel,n)

    Performs the OUTBUF uuo with the specified information; returns 0

Intger = RENAME(channel,array[n>3])

Intger = RENAME(channel,'NAME','EXT',(proj,prog))

    In form 1, performs the RENAME uuo with the address of array

    In form 2, performs the RENAME uuo with the specified information

    Returns 0 if no error, else -1-(error no.)

Intger = ENTER(channel,array[n>3])

Intger = ENTER(channel,'NAME','EXT',(proj,prog))

    In form 1, performs the ENTER uuo with the address of the array

    In form 2, performs the ENTER uuo with the specified information

    Returns 0 if no error, else -1-(error no.)

Intger = LOOKUP(channel,array[n>3])

Intger = LOOKUP(channel,'NAME','EXT',(proj,prog))

    In form 1, performs the LOOKUP uuo with the address the array

    In form 2, performs the LOOKUP uuo with the specified information

    Returns 0 if no error, else -1-(error no.)

*0     = RELEA(channel)

    RELEASE's the specified channel; returns 0

*0     = CLOSE(channel,(n))

    CLOSES the specified channel, n is optional; returns 0

Logic  = IN(channel,([address]))

Logic  = INPUT(channel,(address))

    Performs the IN uuo for the specified channel; returns

    .TRUE. for an error return, .FALSE. otherwise

Logic  = OUT(channel,([address]))

Logic  = OUTPUT(channel,(address))

    Performs the OUT uuo for the specified channel; returns

    .TRUE. for an error return, .FALSE. otherwise

Intger = GETSTS(channel)

    Returns the result of a GETSTS for the given channel

*0     = SETSTS(channel,status)

    Performs the SETSTS uuo for the given channel and status word

Logic  = STATO(channel,bits)

    Returns .TRUE. if a STATO for the given channel gave a skip

    return, .FALSE. otherwise

Logic  = STATZ(channel,bits)

    Returns .TRUE. if a STATZ for the given channel gave a skip

    return, .FALSE. otherwise

Intger = GETCHA(0)

    Returns the number of a free channel starting at channel 17

    or a -1 if there are no free channels

*0     = MTAPE(channel,n)

    Performs the indicated MTAPE function

Intger = UGETF(channel)

    Returns the result of a UGETF uuo on the given channel

*0     = USETI(channel,blknum)

    Performs the USETI uuo for the given channel and block

*0     = USETO(channel,blknum)

    Performs the USETO uuo for the given channel and block

Intger = INCHRW(0)

    Read a character (right justified) from the TTY,

    waiting until one is typed

*0     = OUTCHR(char)

    Type a character (right justified) on the TTY

Intger = INCHRS(0)

    Read a character (right justified) from the TTY;

    return .TRUE. if none typed

*0     = OUTSTR('ASCIZ STRING')

    Type out the ASCII string on the TTY

Intger = INCHWL(0)

    Read a character (right justified) from the TTY,

    but only if a break character has been typed

            (best way to read lines from the TTY)

Intger = INCHSL(0)

    Same as INCHWL, but returns .TRUE. if a line has not

    been typed

Intger = GETLCH((line))

    Returns the line characteristics for the given line;

    assumes caller's line if none given

*0     = SETLCH(intvar)

    Sets the line characteristics for the given line;

    assumes caller's line if none given

Logic  = RESCAN(bit)

    Backs up the TTY scan past one break character; if

    bit is 1, returns .TRUE. if no command in buffer

*0     = CLRBFI(0)

    Clears the input buffer

*0     = CLRBFO(0)

    Clears the output buffer

Logic  = SKPINC(0)

    Returns .TRUE. if a character has been typed, .FALSE.

    otherwise; does not input the character

Logic  = SKPINL(0)

    Returns .TRUE. if a line has been typed, .FALSE.

    otherwise; does not input any characters

*0     = IONEOU(char)

    Types a single 8-bit character on the TTY

**************************** That's All Folks *****************************