35sec interface calls
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  Magic double word on input  :  EAX = $EABE CEDA
                    on output :  EAX = $35EC 35EC


  Service select in BX

  0000 : installed? call
  0001 : allocate memory & read disk from A: to buffer
  0002 :                                  B:
  0003 : select active buffer for drive A: (V1.3+:previous buffer number in cl)
  0004 :                                B: (               "                  )
  0005 : write changed fields of buffer to A:
  0006 :                                   B:
  0007 : write whole buffer to A:
  0008 :                       B:
  0009 : free memory for buffer
  000A : cancel current operation (V1.2+)
  000B : allocate memory only (V1.3+) (ES:DI points to valid boot sector)
  000C : mark all tracks read
  000D : mark selected track read (CH track*2+head)

Installed? call
陳陳陳陳陳陳陳潰
on output:
  EAX set to magic value
  DS  set to 35sec's CS
  BX  set to 35sec's CS
  CX  trashed

Other calls
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on input:
  CL  buffer number, 1..4, 0 for assign operations
  BX  service select

on output:
  EAX set to magic value
  CX  trashed / previous buffer number
  BX  =0000 command not implemented             XNotImpl
      =0001 can't free memory                   XFreeErr
      =0002 memory succesfully freed            XFree
      =0003 already doing something             XWorking
      =0004 attempt to write empty buffer       XBufEmpty
      =0005 bad boot sector                     XBadBoot
      =0006 bad buffer used                     XBadBuffer
      =0007 not enough XMS                      XNoMem
      =0008 incompatible disk                   XBadForm
      =0009 O.K.                                XOK
      =000A can not read boot sector            XReadBoot
      =000B caching started                     XBufSet
      =000C caching ended                       XBufReset
      =000D no such drive                       XNoDrive
      =000E can't cancel operation              XCantCancel
      =000F operation canceled                  XCanceled

35sec callbacks
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  EAX contains magic value EAX = $35EC CA11
  BX contains info on event
    BH = 00 R/W operation done
    BH = 01 R/W operation done with error
      BL =
          7 6 5 4 3 2 1 0
                        X - write operation

    BH = 02 attempt to read from floppy while working
      carry clear -> return error
            set   -> retry

    BH = 03 R/W operation error (Not Implemented)
       7 6 5 4 3 2 1 0
                   X   - write operation
      DH/CX sector info



35sec variables - block starts at cs:103h
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  (103h)
  FailAll BYTE flag: 0 - when drive has asssigned buffer and sector is not in
                           buffer, bypass request to BIOS
                     1 - fail such request

  SecSlid0 BYTE Sector sliding for drive 0:
  SecSlid1 BYTE                          1:

  (106h)
  Disk BYTE Values of actual sector in R/W operation
  Head BYTE  - need to be shifted right by 2
  Cyl  BYTE
  Sec  BYTE

  (Version 1.2+)
  sig  8 BYTES Ascii text, starting with "35sec"
  ver  BYTE Version, BCD

  flags BYTE 7654 3210
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                     \- Windows version