gps files number section

[petrus]

Gpaedia gps files contain a section with numbers from line 84 (after label 1063) until 135 whose function is still a mystery to me.
In the web I found an interesting discussion

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from 2003, but with no explanation.

What I want to know especially, is the reason behind the following changes in 1980mods resp. 1988mods gps:

+--------------+-------------+-----------------------------------------+
| line(s):     | 85, 111     | 100, 126                                |
+--------------+-------------+-----------------------------------------+
| original gps | 05986957435 | -0999999995-0=-096-05555552=-06=-02=-56 |
| 1980 mod gps | 5986957435  | FALSE                                   |
| 1988 mod gps | 5986957435  | =-999999995-0=-96-5555552=-6=-2=-56     |
+--------------+-------------+-----------------------------------------+