Heads up code at 0x5800, and Log ram at 0x5000

[Peter Gargano]

After looking at some disassemblies..
Heads up code at 0x5800, and Log ram at 0x5000 (for '165/'808) ???

The archives say....

! The JRS are to the GM heads up algo that is used to create 
! to original factory cailb. GM'ers call this the "heads up system"
!
! Ward Spoonemore

What's this all about?

"heads up algorithm"??

"original factory calib."??

"log ram??

PG.