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Text File  |  1989-12-15  |  670 b   |  22 lines  |  [TEXT/GEOL]
  1. Item    3089778                         14-Dec-89        18:19
  2.  
  3. From:   MOOF                            Rollin, Keith A
  4.  
  5. To:     MACAPP.TECH$                    MacApp Technical
  6.  
  7. Sub:    Re- >32K Seg /Jump Table
  8.  
  9. Attn: Pillar, Chris Ovard,PRT
  10. SentBy: Keith Rollin
  11.          Reply to:   Re- >32K Seg /Jump Table offset
  12. >  Does the jump table offset only use 15 bits?
  13.  
  14. It uses signed 16-bit values. Since you can only jump >forward< from the
  15. beginning of a code segment, this effectively limits you to a 32K range. This
  16. limit is imposed by the 68000, which only allows signed 16-bit offsets in
  17. PC-relative jumps.
  18.  
  19. - Keith Rollin
  20. - Apple Developer Technical Support
  21.  
  22.