Modules
陳陳陳潰

  35sec - kernel
    35int
    35disk
    35bios
    35buf

  35cache - cache-like shell
    35beep
    35keys
    35scr

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


  Service select is BX

  0000 : installed? call
  0001 : allocate memory & read disk from A: to buffer
  0002 :                                  B:
  0003 : select active buffer for drive A:
  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 : interrupt current operation


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

Other calls
陳陳陳陳陳潰
on input:
  CL  drive number, 1..4
on output:
  EAX set to magic value
  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 R/W succesfully started             XOKRW
      =000A can read boot sector                XReadBoot
      =000B caching started                     XBufSet
      =000C caching ended                       XBufReset

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