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Features & Specifications

Contents

Languages

  • Pre-ANSI C with ANSI C prototype support
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Operating systems

  • Linux
  • Sun Solaris 1.X
  • Sun Solaris 2.3 or higher

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Target processors

  • National Semiconductor F9450
  • Honeywell Generic VHSIC Spaceborne RH1750
  • Honeywell PDU/SDU
  • Performance Semiconductor PACE 1750A
  • Marconi Electronic Devices MIL-STD-1750A.
  • Fairchild SBC
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Basic data types

    char

    unsigned 8-bit integer

    short

    signed 16-bit integer

    long

    signed 32-bit integer

    int

    same as "short"

    float

    32-bit MIL-STD-1750A floating-point value

    double

    48-bit MIL-STD-1750A floating-point value

    enum

    enumerated data type(s)

    unsigned

    same as "char"

    unsigned

    short unsigned 16-bit integer

    unsigned

    long unsigned 32-bit integer

    unsigned

    int same as "unsigned short"

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Additional data types

XTC-1750A also supports pointers, arrays, structures, and unions. These data types can be nested to three levels.

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Address space

  • Storage unit: 16-bit word
  • Addressing range: 64K words
  • User-defined address states specify virtual address space, which is mapped into arbitrary blocks of physical memory
  • Code and data mapped into the same 64K-word address space
  • "C" used to access multiple address spaces through overlays
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Relocatable memory segments

    IREL

    Run-time initialization code

    ROM

    KREL

    Constants (excluding in-line constants)

    ROM

    NREL

    Normal user code

    ROM

    SREL

    Global and static variables

    RAM

    ZREL

    General-purpose segment

    RAM or ROM

Notes on memory segments:

    • The XTC-1750A compiler generates most 16-bit numeric constants in-line using 1750A instructions.
    • The IREL segment contains code that copies constants from the KREL segment to variables located in the SREL segment; the XTC-1750A program start-up module calls the IREL code at start-up time.
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Core library routines

    Note: Additional routines provided on request

      atof

      atoi

      atol

      index

      isalnum

      isalpha

      isascii

      iscntrl

      isdigit

      iseol

      islower

      isodigit

      isprint

      ispunct

      isspace

      isupper

      isxdigit

      itoa

      longjmp

      rindex

      setjmp

      strcat

      strchr

      strcmp

      strcpy

      strcspn

      strlen

      strncat

      strncmp

      strncpy

      strpbrk

      strrchr

      strspn

      toascii

      tolower

      toupper

      abs

      acos

      acosh

      acot

      acoth

      acsc

      acsch

      asec

      asin

      asinh

      atan

      atan2

      atanh

      cbrt

      ceil

      cos

      cosh

      cot

      coth

      csc

      csch

      dtor

      exp

      fabs

      floor

      frac

      hypot

      ipow

      log

      log10

      pow

      powe

      powi

      rand

      rtod

      sec

      sech

      sin

      sinh

      sqrt

      srand

      tan

      tanh

      calloc

      free

      malloc

      mflush

      realloc

      fprintf

      getc

      getchar

      getcnb

      printf

      putc

      putchar

      putcnb

      scanf

      sprintf

      inb

      outb

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Interrupt processing

  • Interrupt handlers are written in assembly language; "C" subroutines may be used
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