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Assembly Source File  |  1991-04-21  |  11KB  |  275 lines
  1. ; Customized table for PERSTOR PS180-8AT/XT controller.
  2. ;
  3. ; By Bruce Travers - GEnie: TRAVERS
  4. ;
  5. ; Based on original SET_TYPE by Juan Jimenez.
  6. ;
  7. ; This program and source code may be freely distributed. It will 
  8. ; load a drive parameter table into memory and point the Perstor 
  9. ; controller to it instead of its own ROM table. This means you can
  10. ; change the table at your convenience to suit any type of drive. This
  11. ; works on my AT compatable 386 system with PS-180-8AT/XT controllers
  12. ; with universal BIOS. I do not guarantee it will work on every system.
  13. ;
  14. ; See the SET_TYPE.ASM file in this archive for some interesting 
  15. ; comments by Juan. This program is essentially the same except it has
  16. ; been modified to suit Perstor controllers.
  17. ;  
  18. ; 1) Jumper the Perstor controller so that drive unit 0 is the same number
  19. ;    of heads as your actual disk drive. Try and use table 1 if possible
  20. ;    since this will save you RAM because you won't have to load all
  21. ;    the tables resident. 
  22. ;
  23. ;    Example: You have a Seagate ST-251 with 820 cylinders and 6 heads.
  24. ;    Jumper the Perstor as Table 1 Entry 1 (615 cylinders by 6 heads).
  25. ;    Even though 820/6 is directly supported this means you will have to
  26. ;    use Table 3 at the cost of an extra 128 bytes RAM (each table contains
  27. ;    4 drives at 16 bytes per drive). Of course, if you don't mind using the
  28. ;    extra RAM you should choose the table that has an exact match if possible.
  29. ;
  30. ;    - If you can't find an entry with the same number of heads, try one with
  31. ;      less heads. I don't know if it will work or not but the original 
  32. ;      SET_TYPE indicated it would.
  33. ;
  34. ;    - Use an entry with less cylinders than your actual disk drive. I have 
  35. ;      tried more heads and it seems to work but why take chances ?
  36. ;
  37. ; 2) The table selected in step 1 is now the table where we can change the
  38. ;    parameters. This source includes parameters as documented for
  39. ;    the Universal BIOS. Find the table you chose in step 1 and modify the
  40. ;    4 drive entries to suit your disk drives. Don't forget to change the
  41. ;    boot disk to its actual parameters!
  42. ;
  43. ; 3) If you have more than 1 disk drive, jumper the Perstor unit 1 to 
  44. ;    reflect the entry which you changed in the source below, as it will
  45. ;    be your table not the ROM. (Likewise if you have 2 additional drives
  46. ;    on another Perstor).
  47. ;
  48. ; 4) Assemble and link the program and try it out. Disk Manager and other
  49. ;    utilities which use those tables should now report the correct number
  50. ;    of heads and cylinders as per your customization. (Use ASSEMBLE.BAT).
  51. ;    
  52. ; 5) If you want to save memory, delete all the tables AFTER the table you
  53. ;    are using. In my case, I use table 1 so have deleted tables 2-4 and
  54. ;    end up using 64 bytes of RAM instead of 256 bytes. These are BYTES,
  55. ;    not K Bytes so some people may not bother!
  56. ; 
  57. ;    You may also delete the entries in the same table AFTER the entries
  58. ;    you are using. In my case I am using entry 1 through 3 so have deleted
  59. ;    entry 4 and saved another 16 bytes. 
  60. ;
  61. ; 6) An alternative method of modifying the table is to modify PS-BIOS.COM
  62. ;    using a disk editor such as Norton. Find the hex values and change them
  63. ;    to whatever your drives really are.
  64. ;-----------------------------------------------------------------------------
  65. code            segment    para
  66.                 assume     cs:code,ds:code
  67.                 org        100h
  68. psbios          proc       far
  69.                 jmp        init
  70.  
  71. table1:         dw         615d             ; cyls       ENTRY 1
  72.                 db         6d               ; heads
  73.                 dw         615d             ; cyls
  74.                 dw         615d             ; cyls
  75.                 db         0bh
  76.                 db         05h
  77.                 db         0
  78.                 db         0
  79.                 db         0
  80.                 dw         0
  81.                 db         0
  82.                 db         0
  83.                 dw         615d             ; cyls       ENTRY 2
  84.                 db         8d               ; heads
  85.                 dw         615d             ; cyls
  86.                 dw         615d             ; cyls
  87.                 db         0bh
  88.                 db         05h
  89.                 db         0
  90.                 db         0
  91.                 db         0
  92.                 dw         0
  93.                 db         0
  94.                 db         0
  95.                 dw         733d             ; cyls       ENTRY 3
  96.                 db         5d               ; heads
  97.                 dw         733d             ; cyls
  98.                 dw         733d             ; cyls
  99.                 db         0bh
  100.                 db         05h
  101.                 db         0
  102.                 db         0
  103.                 db         0
  104.                 dw         0
  105.                 db         0
  106.                 db         0
  107.                 dw         733d             ; cyls       ENTRY 4
  108.                 db         7d               ; heads
  109.                 dw         733d             ; cyls
  110.                 dw         733d             ; cyls
  111.                 db         0bh
  112.                 db         05h
  113.                 db         0
  114.                 db         0
  115.                 db         0
  116.                 dw         0
  117.                 db         0
  118.                 db         0
  119. table2:         dw         612d             ; cyls       ENTRY 1
  120.                 db         4d               ; heads
  121.                 dw         612d             ; cyls
  122.                 dw         612d             ; cyls
  123.                 db         0bh
  124.                 db         05h
  125.                 db         0
  126.                 db         0
  127.                 db         0
  128.                 dw         0
  129.                 db         0
  130.                 db         0
  131.                 dw         1024d            ; cyls       ENTRY 2
  132.                 db         5d               ; heads
  133.                 dw         1024d            ; cyls
  134.                 dw         1024d            ; cyls
  135.                 db         0bh
  136.                 db         05h
  137.                 db         0
  138.                 db         0
  139.                 db         0
  140.                 dw         0
  141.                 db         0
  142.                 db         0
  143.                 dw         1024d            ; cyls       ENTRY 3
  144.                 db         8d               ; heads
  145.                 dw         1024d            ; cyls
  146.                 dw         1024d            ; cyls
  147.                 db         0bh
  148.                 db         05h
  149.                 db         0
  150.                 db         0
  151.                 db         0
  152.                 dw         0
  153.                 db         0
  154.                 db         0
  155.                 dw         1024d            ; cyls       ENTRY 4
  156.                 db         15d              ; heads
  157.                 dw         1024d            ; cyls
  158.                 dw         1024d            ; cyls
  159.                 db         0bh
  160.                 db         05h
  161.                 db         0
  162.                 db         0
  163.                 db         0
  164.                 dw         0
  165.                 db         0
  166.                 db         0
  167. table3:         dw         615d             ; cyls       ENTRY 1
  168.                 db         4d               ; heads
  169.                 dw         615d             ; cyls
  170.                 dw         615d             ; cyls
  171.                 db         0bh
  172.                 db         05h
  173.                 db         0
  174.                 db         0
  175.                 db         0
  176.                 dw         0
  177.                 db         0
  178.                 db         0
  179.                 dw         977d             ; cyls       ENTRY 2
  180.                 db         5d               ; heads
  181.                 dw         977d             ; cyls
  182.                 dw         977d             ; cyls
  183.                 db         0bh
  184.                 db         05h
  185.                 db         0
  186.                 db         0
  187.                 db         0
  188.                 dw         0
  189.                 db         0
  190.                 db         0
  191.                 dw         820d             ; cyls       ENTRY 3
  192.                 db         6d               ; heads
  193.                 dw         820d             ; cyls
  194.                 dw         820d             ; cyls
  195.                 db         0bh
  196.                 db         05h
  197.                 db         0
  198.                 db         0
  199.                 db         0
  200.                 dw         0
  201.                 db         0
  202.                 db         0
  203.                 dw         1024d            ; cyls       ENTRY 4
  204.                 db         9d               ; heads
  205.                 dw         1024d            ; cyls
  206.                 dw         1024d            ; cyls
  207.                 db         0bh
  208.                 db         05h
  209.                 db         0
  210.                 db         0
  211.                 db         0
  212.                 dw         0
  213.                 db         0
  214.                 db         0
  215. table4:         dw         925d             ; cyls       ENTRY 1
  216.                 db         5d               ; heads
  217.                 dw         925d             ; cyls
  218.                 dw         925d             ; cyls
  219.                 db         0bh
  220.                 db         05h
  221.                 db         0
  222.                 db         0
  223.                 db         0
  224.                 dw         0
  225.                 db         0
  226.                 db         0
  227.                 dw         925d             ; cyls       ENTRY 2
  228.                 db         9d               ; heads
  229.                 dw         925d             ; cyls
  230.                 dw         925d             ; cyls
  231.                 db         0bh
  232.                 db         05h
  233.                 db         0
  234.                 db         0
  235.                 db         0
  236.                 dw         0
  237.                 db         0
  238.                 db         0
  239.                 dw         1024d            ; cyls       ENTRY 3
  240.                 db         7d               ; heads
  241.                 dw         1024d            ; cyls
  242.                 dw         1024d            ; cyls
  243.                 db         0bh
  244.                 db         05h
  245.                 db         0
  246.                 db         0
  247.                 db         0
  248.                 dw         0
  249.                 db         0
  250.                 db         0
  251.                 dw         925d             ; cyls       ENTRY 4
  252.                 db         5d               ; heads
  253.                 dw         925d             ; cyls
  254.                 dw         925d             ; cyls
  255.                 db         0bh
  256.                 db         05h
  257.                 db         0
  258.                 db         0
  259.                 db         0
  260.                 dw         0
  261.                 db         0
  262.                 db         0
  263. theend:         db         0                ; Do Not Delete
  264. init:           mov        ax,cs
  265.                 mov        ds,ax
  266.                 mov        dx,offset table1
  267.                 mov        ah,25h
  268.                 mov        al,41h
  269.                 int        21h
  270.                 mov        dx,offset theend
  271.                 int        27h
  272. psbios          endp
  273. code            ends
  274.                 end        psbios 
  275.