VAX/vax780_bug_history.txt - emulators/simh - Rivoreo Source Code Repositories

 Bugs Found And Fixed During Simulator Debug

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

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