80287

Intel 287
Numerics processor extension that extends the iAPX 286 architecture with floating point, extended integer and BCD data types; using a numerics oriented architecture, the 80287 adds over fifty mnemonics to the iAPX 286 instruction set; the 80287 is implemented in N-channel, depletion load and silicon gate HMOS technology

- 80-Bit internal architecture

- implements proposed IEEE floating point standard

- expands iAPX 286 datatypes to include 32-, 64-, 80-bit floating point, 32-, 64-bit
  integers and 18-digit BCD operands

- object code compatible with 8087

- built-in exception handling

- operates in both Real and Protected mode iAPX 286 systems

- protected mode operation completely conforms to the iAPX 286 memory
  management and protection mechanisms

- directly extends iAPX 286 instruction set to trigonometric, logarithmic, exponential
  and arithmetic instructions for all datatypes

- 8x80-bit, individually addressable, numeric register stack

- available in express-standard temperature range

Intel 287XL

The 287XL math coprocessor adds over seventy mnemonics to the iAPX 286 microprocessor instruction set; compatible with 287 and 8087 math coprocessors; manufactured with low-power CHMOS III technology

- interfaces with 8286 and 80C286 CPUs

- operates in any socket designed for Intel 80287 or Intel 287XL up to 12.5 MHz clock
  speeds

- implements ANSI / IEEE standard 754-1985 for binary floating-point arithmetic

- 50 % higher performance than Intel 80287

- upward object code compatible from Intel 80287 and 8087

- expands datatypes to include 32-, 64-, 80-bit floating point or integers and 18-digit
  BCD operands

- extends CPU instruction set to trigonometric, logarithmic, exponential and
  arithmetic instructions

- implements Intel 387 transcendental operations for SINE, COSINE, ANGENT,
  ARCTANGENT and LOGARITHM

- eight 80-bit numeric registers; for stack use or individual access

- available in 40 pin CERDIP as Intel 287 XL and 44 pin PLCC as Intel XLT (see
  examples below)