Motorola MVME166D2 manual Single Precision Real, Double Precision Real, Extended Precision Real

Using the 166Bug Debugger

Single Precision Real

This format would appear in memory as:

1-bit sign field	(1 binary digit)
8-bit biased exponent field	(2 hex digits. Bias = $7F)
23-bit fraction field	(6 hex digits)

4

A single precision number takes 4 bytes in memory.

Double Precision Real

This format would appear in memory as:

1-bit sign field	(1 binary digit)
11-bit biased exponent field	(3 hex digits. Bias = $3FF)
52-bit fraction field	(13 hex digits)

A double precision number takes 8 bytes in memory.

Note

The single and double precision formats have an implied integer bit (always 1).

Extended Precision Real

This format would appear in memory as:

1-bit sign field	(1 binary digit)
15-bit biased exponent field	(4 hex digits. Bias = $3FFF)
64-bit mantissa field	(16 hex digits)

An extended precision number takes 10 bytes in memory.

4-18 MVME166 Single Board Computer Installation Guide