
Floating Point Support
Floating Point Support
The floating point unit (FPU) of the MC68040 microprocessor chip is supported in 162Bug. For MVME162Bug, the commands MD, MM, RM, and RS have been extended to allow display and modification of floating point data in registers and in memory. Floating point instructions can be assembled/disassembled with the DI option of the MD and MM commands.
Valid data types that can be used when modifying a floating point data register or a floating point memory location:
4 |
Integer Data Types
12Byte
1234Word
12345678 Longword
Floating Point Data Types
1_FF_7FFFFF | Single Precision Real Format |
1_7FF_FFFFFFFFFFFFF | Double Precision Real Format |
1_7FFF_FFFFFFFFFFFFFFFF | Extended Precision Real Format |
1111_2103_123456789ABCDEF01 | Packed Decimal Real Format |
Scientific Notation Format (decimal) |
When entering data in single, double, extended precision, or packed decimal format, the following rules must be observed:
1.The sign field is the first field and is a binary field.
2.The exponent field is the second field and is a hexadecimal field.
3.The mantissa field is the last field and is a hexadecimal field.
4.The sign field, the exponent field, and at least the first digit of the mantissa field must be present (any unspecified digits in the mantissa field are set to zero).
5.Each field must be separated from adjacent fields by an underscore.
6.All the digit positions in the sign and exponent fields must be present.
MVME162IG/D2 |