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Join Date: May 2002
Location: Santa Barbara, CA
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So your code is LJMP 0x028B. You should see the EPROM being accessed at 0x0000, 0x0001, 0x0002, 0x028B, 0x028C and so forth. Disassemble the code to understand what it does and when it jumps.

I don’t know what software options you have but you need to sample 10 address lines (A0 - A9) to decode the LJMP destination. I can assign what lines will be considered for the decoding to hex. If your SW doesn’t allow that check if sigrok works with your analyzer hardware
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1974 Targa 3.6, 2001 C4 (sold), 2019 GT3RS, 2000 ML430

I repair/rebuild Bosch CDI Boxes and Porsche Motronic DMEs
Porsche "Hammer" or Porsche PST2, PIWIS III - I can help!!
How about a NoBadDays DualChip for 964 or '95 993
Old 08-10-2025, 03:42 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #102 (permalink)