*Single Precision (one 36-bit word) floating point*:

PDP-10 floating point single
precision: |
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0 |
1 |
2 |
3 |
4 |
5 |
6 |
7 |
8 |
9 |
10 |
11 | 12 | 13 |
14 | 15 |
16 |
17 | 18 | 19 |
20 |
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22 |
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25 |
26 |
27 | 28 |
29 |
30 |
31 |
32 | 33 |
34 |
35 |

Sign Bit | Exponent (bias: 128_{10}) |
Fraction: bit 9 is the most significant |

*Double Precision (two 36-bit words) floating point:*

Double Precision (72 bits):
First 36-bit Word: |
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1 |
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8 |
9 |
10 |
11 | 12 | 13 |
14 | 15 |
16 | 17 | 18 | 19 |
20 | 21 |
22 | 23 |
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27 | 28 |
29 |
30 | 31 |
32 | 33 |
34 |
35 |

Sign Bit | Exponent (bias: 1024_{10}) |
Fraction (First, most significant part): bit 12 is the most significant |

Double Precision (72 bits):
Second 36-bit Word: |
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0 |
1 |
2 |
3 |
4 |
5 |
6 |
7 |
8 |
9 |
10 |
11 | 12 | 13 |
14 | 15 |
16 | 17 | 18 | 19 |
20 | 21 | 22 | 23 | 24 | 25 |
26 |
27 | 28 |
29 |
30 |
31 |
32 | 33 |
34 |
35 |

Ignored | Fraction (Second, less significant part): bit 1 is the most significant bit in this word |

EXPONENT (**E**): To the base 2, with a bias in the single precision
floating point of 128 decimal (200 octal), and in the double precision
floating point of 1024 decimal (2000 octal).

FRACTION: Has no hidden bit.

NEGATIVES (In the Fraction): Twos complement.

The value of the number **N** is **N** = **F x 2 ^{E-128}**
(Single precision), or

INTEGERS: 2's complement.-34,359,738,368 to +34,359,738,367