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Debugger General Information

Floating Point Support

The floating point unit (FPU) of the MC68060 microprocessor chip is supported in 177Bug. For MVME177Bug, the commands:

MD

MM

RM

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

MMcommands.

Valid data types that can be used when modifying a floating point data register or a floating point memory location:

Integer Data Types

12Byte

1234 Word

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

 

 

-3.12345678901234501_E+123

ScientiÞc Notation Format (decimal)

 

 

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Motorola MVME177 manual Floating Point Support, Integer Data Types, Floating Point Data Types