Intel M80C287
M80C287 is a high-performance numerics processor extension that extends the architecture of the M80C286 CPU with floating point extended integer and BCD data types A computing system that includes the M80C287 fully conforms to the IEEE Floating Point Standard Using a numerics oriented architecture the M80C287 adds over seventy mnemonics to the instruction set of the M80C286 CPU making a complete solution for high-performance numerics processing The M80C287 is implemented with 1 5 micron high-speed CHMOS III technology and packaged in a 40-pin CERDIP The M80C287 is upward object-code...| Part No. | M80C287 |
|---|---|
| Datasheet | M80C287 Download |
| Manufacturer |  Intel |
| Description | 80-BIT CHMOS III NUMERIC PROCESSOR EXTENSION |
| Buy | Stock & Price |
DESCRIPTION
The M80C287 Numeric Processor Extension (NPX) provides arithmetic instructions for a variety of numeric data types It also executes numerous built-in transcendental functions (e g tangent sine cosine and log functions) The M80C287 effectively extends the register and instruction set of the CPU for existing data types and adds several new data types as well Figure 2 shows the additional registers visible to programs in a system that includes the M80C287 Essentially the M80C287 can be treated as an additional resource or an extension to the M80C286 CPU The M80C286 CPU together with an M80C287 NPX can be used as a single unified system The M80C287 has two operating modes After reset the M80C287 is in the real-address mode It can be placed into protected mode by executing the FSETPM instruction It can be switched back to realaddress mode by executing the FRSTPM instruction (note that this feature is useful only with CPU’s that can also switch back to real-address mode) These in...
