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1. HP-11C Self-Test Help (2 Replies)
2. HP-41 MCODE, unused bits in chip 0 (5 Replies)
3. HP-41: Formula Evaluation ROM (18 Replies)
4. HP 32s Aniversary Edition Mint Condition Question (0 Replies)
5. Small challenge (16 Replies)
6. HP-67, 34C, 29C, etc. GTO 00 (2 Replies)
7. HP 82143A / HP 82162A foto coupler (encoder) - substitute (22 Replies)
8. Intermittent black squares printing from Pioneers to 82240B (18 Replies)
9. HP67 Card read error (4 Replies)
10. Performing arbitrary I/O with the 41CL serial port (2 Replies)
11. HP-19C repaired (20 Replies)
12. HP48SX annunciator line problem (9 Replies)
13. Bitwise functions for 27S? (1 Reply)
14. 48G thousands separator in Standard number? (16 Replies)
15. HP-71B: trying to get pyILPER fully working on my Mac (8 Replies)
16. Max thermal paper diameter for 82240B? (19 Replies)
17. Why HP 42S for Electrical Engineering? (12 Replies)
18. 2015 version of HP12c identification (14 Replies)
19. Here we go.... (48G fixing and MEMORY UPGRADE) (43 Replies)
20. Using HP's 12C and 15C emulators (5 Replies)
21. Unexpected Feature on HP-22 (10 Replies)
22. Blog posts and articles about HP calculators (7 Replies)
23. HP 45 High Precision Timer (12 Replies)
24. Protective case for Pioneers? (5 Replies)
25. Update of HP-41 module liste (39 Replies)
26. Who invented MCODE? (3 Replies)
27. HP-25: charging of battery pack (4 Replies)
28. Programmable Calculators: The First Generation (17 Replies)
29. Some old code samples for HP 50g (1 Reply)
30. 50g question: How to lock in PROOT sub-menu? (2 Replies)