VAX/vax780_bug_history.txt

   1 Bugs Found And Fixed During Simulator Debug
   2
   3 1. RP: drive clear does not clear RPDA.
   4 2. TU: default formatter must be TM03.
   5 3. SBI: drive 'letter' is actually a 1-based number.
   6 4. MBA: drive register reads return SR<31:16> as high word.
   7 5. UBA: DMA addresses must be masked to Unibus width (18b).
   8 6. HK: thread used multiple times if SEEK is followed by NOP or DCLR.
   9 7. HK: only DCLR clears ATA.
  10 8. MEM: MS780E size declaration off-by-1.
  11 9. MEM: MS780E array start off by >> 4.
  12 10. MEM: CSR-C register write logic incorrect.
  13 11. CIS: CMPP3/CMPP4 using wrong arguments to ReadDstr.
  14 12. CPU, OCTA: CVTfi with integer overflow not setting trap if PSW<iv> = 1.
  15 13. STDDEV: read of ICR was missing the call parameter.
  16 14. ACBD/G: testing wrong operand register to get limit sign.
  17 15. CPU: faults not clearing PSL<tp>.
  18 16. ADAWI: register mode implemented incorrectly.
  19 17. MOVTC: condition codes not preserved through page fault.
  20 18. MOVTUC: condition codes not preserved through page fault.
  21 19. MOVTUC: escape tested against untranslated rather than translated character.
  22 20. CVTPT: condition code and decimal overflow calculation incorrect.
  23 21. CVTPS: condition code and decimal overflow calculation incorrect.
  24 22. CVTPL: if destination is register, result is stored after register updates.
  25 23. CVTPL: integer overflow set <C> rather than <V>.
  26 24. all decimal string: 11/780 does not validate characters in decimal strings.
  27 25. EDITPC: condition codes not preserved through page fault.
  28 26. EDITPC EO$INSERT: inserts sign instead of fill.
  29 27. EDITPC EO$BLANK_ZERO: address off by one.
  30 28. EDITPC EO$BLANK_ZERO: not testing for <C> set.
  31 29. EDITPC EO$LOAD_PLUS: not skipping character if test fails.
  32 30. EDITPC EO$LOAD_MINUS: not skipping character if test fails.
  33 31. Compatibility mode: SXT not implemented.
  34 32. Compatibility mode: XOR operands fetched in wrong order.
  35 33. MNEGH: condition codes set from original sign.
  36 34. MNEGH: <C> not cleared.
  37 35. H_floating quad precision integer routines (add, inc, neg): carry propagation incorrect.
  38 36. H_floating packup routines: test for zero used exponent not fraction.
  39 37. MULH: carries out of floating accumulator lost.
  40 38. DIVH: stores wrong operand as result.
  41 39. POLYF/D/G: truncation after add not needed.
  42 40. POLYF/D/G: early SRM requires truncation to 31b/63b, not 32b/64b.
  43 41. POLYF/D/G/H: exits too early if argument is zero.
  44 42. POLYD/G/H: calculates address of residual pointer result incorrectly.
  45 43. POLYD/G: performs single precision rather than double precision multiply.
  46 44. POLYH: fails to truncate intermediate result from 128b to 127b.
  47 45. POLYF/D/G/H: internal add routine must test fraction rather than exponent to
  48     detect zero, POLYx can create "denormalized" intermediate result.
  49 46. EMODH: concatenate 16b of extension operand instead of 15b.
  50 47. Specifier flows: modify flows testing for read access rather than write access.
  51 48. Quad/octa writes: wrong address reported on faulting cross-page writes.
  52 49. Memory management: 11/780 implements access control test on first level PTE's.
  53 50. LDPCTX: 11/780 implements mbz tests on PCB fields.
  54 51. LDPCTX/MTPR: 11/780 validity checks PCBB, SCBB, SBR, SLR, P0BR, P0LR, P1BR, P1LR.
  55 52. TMR: tmr_inc not updated in standard (100Hz) mode.
  56 53. MTPR SBR/PCBB/SCBB: 11/780 only checks that bits<1:0> == 0.
  57 54. MTPR xLR: 11/780 excludes bits<31:24> from mbz test.
  58 55. MTPR PxBR: 11/780 only checks bits<31,1:0> == 1,00.
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