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Floating Point Support
The floating point unit (FPU) of the MC68040 microprocessor chip is
supported in 166Bug. For MVME166Bug, 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:
1_FF_7FFFFF
1_7FF_FFFFFFFFFFFFF
1_7FFF_FFFFFFFFFFFFFFFF
1111_2103_123456789ABCDEF01
-3.12345678901234501_E+123
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.
MVME166IG/D2
Integer Data Types
12
Byte
1234
Word
12345678
Longword
Floating Point Data Types
Single Precision Real Format
Double Precision Real Format
Extended Precision Real Format
Packed Decimal Real Format
Scientific Notation Format (decimal)
Floating Point Support
4-17
4
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