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  1.                     S-100 Floppy Disk Controller Survey
  2.  
  3.                                August 1982
  4.                        (Last Revision:  4 Sept 82)
  5.  
  6.  
  7. Manufacturer:  SD Systems   SD Systems   NorthStar     CCS     InterSystems
  8. Board:          Versa I      Versa II     MDS SD      2422A       FDC II
  9. Controller:    WD 1771B-1    WD 1791-1   (obsolete)  WD 1793   NEC uPD 765A
  10. Max # Drives:      4             4           3          4           4
  11. 8" Drives:        Yes           Yes         No         Yes         Yes
  12. 5.25" Drives:     Yes           Yes         Yes        Yes         Yes
  13. Simultaneously:   No            Yes         No         Yes         Yes
  14. Single Density:   Yes           Yes         Yes        Yes         Yes
  15. Double Density:   No            Yes         No         Yes         Yes
  16. Double Sided:     Yes           Yes         No         Yes         Yes
  17. DMA Data Xfer:    No            No          No         No          ???
  18. Interrupts:       Yes           Yes         ???        Yes         Yes
  19. Serial Port:      No            No          No         No          No
  20. Power On Jump:    No            No          No         No          ???
  21. CP/M Included:    No            No          No         Yes         No
  22. BIOS Included:    Yes           Yes         No         Yes         Yes
  23. Reliability:      Fair          Good        Good       Good        Good
  24. Integration:      Fair          Fair        Fair       Easy        Fair
  25. BIOS Quality:     Fair          Fair        Poor       Good        Good
  26. Board Docs:       Fair          Fair        Good       Good        Good
  27.  
  28.  
  29. Manufacturer:  Morrow Des.  Morrow Des.  Morrow Des.  Godbout      Jade
  30. Board:           DJ 1D       DJ 2D/B       DJ DMA     Disk 1     Double D
  31. Controller:     bipolar      WD 1791-1   Z80/bipolar  uPD 765A   WD 1791-1
  32. Max # Drives:      4             4           8           4           4
  33. 8" Drives:        Yes           Yes      Yes (4 max)    Yes         Yes
  34. 5.25" Drives:     No            No       Yes (4 max)    Yes         Yes
  35. Simultaneously:   ---           ---         Yes         No          No
  36. Single Density:   Yes           Yes         Yes         Yes         Yes
  37. Double Density:   No            Yes         Yes         Yes         Yes
  38. Double Sided:     No            Yes         Yes         Yes         Yes
  39. DMA Data Xfer:    No            No          Yes         Yes         No
  40. Interrupts:       No            Yes         Yes         Yes         Yes
  41. Serial Port:      Yes           Yes      Diagnostic  Diagnostic     Yes
  42. Power On Jump:    Yes           Yes         Yes         No          No
  43. CP/M Included:    Yes           Yes         Yes         Yes         No
  44. BIOS Included:    Yes           Yes         Yes         Yes         Yes
  45. Reliability:      Fair          Good        Good        Good        Fair
  46. Integration:      Easy          Easy        Fair        Easy     Difficult
  47. BIOS Quality:     Good          Good        Good        Good        Fair
  48. Board Docs:       Fair          Good        Good        Good        Fair
  49.  
  50.  
  51. Manufacturer:   Tarbell       Tarbell    Micropolis    MS & C
  52. Board:          FDI-SD        FDI-DD     MacroFloppy   DD-FDC
  53. Controller:     WD 1771      WD 1791-1    bipolar     uPD 765A
  54. Max # Drives:      4             4           4            4
  55. 8" Drives:        Yes           Yes         No           Yes
  56. 5.25" Drives:     No            No          Yes          Yes
  57. Simultaneously:   ---           ---         ---          No
  58. Single Density:   Yes           Yes         Yes          Yes
  59. Double Density:   No            Yes         No           Yes
  60. Double Sided:     No            Yes         No           Yes
  61. DMA Data Xfer:    No            Yes         No           Yes
  62. Interrupts:       No            Yes         No           Yes
  63. Serial Port:      No            No          No           No
  64. Power On Jump:    No            Yes         No           Yes
  65. CP/M Included:    No            No          No           No
  66. BIOS Included:    Yes           Yes         No           Yes
  67. Reliability:      Good          Good        Fair         Good
  68. Integration:      Fair          Easy        Fair         Fair
  69. BIOS Quality:     Fair          Good        Fair         Good
  70. Board Docs:       Poor          Poor        Fair         Good
  71.  
  72.  
  73.