user manual

Using the 197Bug Debugger
4-8 Installation Guide
4
Single Precision Real
This format would appear in memory as:
A single precision number takes 4 bytes in memory.
Double Precision Real
This format would appear in memory as:
A double precision number takes 8 bytes in memory.
Note
The single and double precision formats have an implied
integer bit (always 1).
Scientific Notation
This format provides a convenient way to enter and display a floating point
decimal number. Internally, the number is assembled into a packed decimal
number and then converted into a number of the specified data type.
Entering data in this format requires the following fields:
An optional sign bit (+ or -).
One decimal digit followed by a decimal point.
Up to 17 decimal digits (at least one must be entered).
An optional Exponent field that consists of:
An optional underscore.
The Exponent field identifier, letter “E”.
An optional Exponent sign (+, -).
From 1 to 3 decimal digits.
For more information about the floating point SFU, refer to the MVME197BUG
197Bug Debugging Package User’s Manual.
1-bit sign field (1 binary digit)
8-bit biased exponent field (2 hex digits. Bias = $7F)
23-bit fraction field (6 hex digits)
1-bit sign field (1 binary digit)
11-bit biased exponent field (3 hex digits. Bias = $3FF)
52-bit fraction field (13 hex digits)