Only paper documentation that came with pegasos (thus you should have it too) is sinlge paper describing all necessary connectors on board. If you ain't got that paper look from CD: (Mos 1.3) .. it'll has same info on PDF files.
on DOCS/AUDIO.PDF are pinouts for audio connectors
and DOCS/FRONTPAN.PDF are pinouts for front panel connector...
And I seem to remember that this same info was available on net, but can't remember where...
