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  1. 41CX Battery Corrosion (2 Replies)
  2. How do I upload images? (2 Replies)
  3. Would the HP-15C Limited Edition Firmware Age Away? (38 Replies)
  4. Using non-rechargeable batteries on old HP calculators (20 Replies)
  5. HP 50g/HP 49g+/HP 39gs Battle of the beams -- Increasing IR communication range (6 Replies)
  6. Die shots of all integrated circuits of an Hp41c (29 Replies)
  7. LIFUTILS: reading and writing HP9114 compatible floppy disks (3 Replies)
  8. HP-35 & SL-4 (2 Replies)
  9. HP-71B Changing Lower and Upper Halves (7 Replies)
  10. Successfully changed the broken fan of a HP-9825B (2 Replies)
  11. HP41CL newbie question (31 Replies)
  12. Is this 12C HP is a true and original ? (21 Replies)
  13. HP-50g plots of cube roots (no negative domain displayed) (2 Replies)
  14. Hand-Drawn Barcodes for the HP41 (15 Replies)
  15. HP21 - What's the best way to clean it? (3 Replies)
  16. Service Manual for SPICE series? (Dead 34C) (Repaired) (7 Replies)
  17. Challenge: XCAS code to anothers CAS (0 Replies)
  18. Broken switch metal rebuild? (0 Replies)
  19. 50g: an interesting RAND anomaly (21 Replies)
  20. [math puzzle] Payment in fraction of gold bars. (1 Reply)
  21. Programming issue HP41CX (59 Replies)
  22. New to me HP35s (0 Replies)
  23. Help with DCF and Cap Rate Problem (2 Replies)
  24. Spice without serial number (0 Replies)
  25. Returning more than 12 digits for a result (3 Replies)
  26. HP 11C internal number format? (4 Replies)
  27. 41CX halfnut keyboard not responding (12 Replies)
  28. Weird Command in a Program (12 Replies)
  29. Restore HP-29C yellowed case (5 Replies)
  30. HP-29C Low-battery warning, help needed please! (6 Replies)
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