INT 15H c0H: Get System Parameters

 Expects: AH    c0H
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 Returns: AH    00H (and CF=NC=0) successful, and ES:BX points to valid data
                86H (and/or CF=CY=1) unsuccessful
          ES:BX addr of system configuration table
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    Info: This returns a pointer to a table that describes the system.

BiosSysParmsRec
  Offset Size Contents
  ▀▀▀▀▀▀ ▀▀▀▀ ▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀
   +0      2  wLen       length of this table, in bytes
   +2      1  yModel     PC=ff,XT=fe or fb, PCjr=fd, AT=fc, unknown=ff
   +3      1  ySubModel  PC,XT,PCjr,AT=00; AT=01, XT-286=02
   +4      1  yRevLvl    BIOS revision level (0=initial release)
   +5      1  rFeatures1 features bits:
              ┌7┬6┬5┬4┬3┬2┬1┬0┐
              │ │ │ │ │ │ │ │0│
              └╥┴╥┴╥┴╥┴╥┴╥┴╥┴-┘ bit  mask
               ║ ║ ║ ║ ║ ║ ║ ╚══► 0: 01H  (reserved)
               ║ ║ ║ ║ ║ ║ ╚════► 1: 02H  0=PC-type I/O channel
               ║ ║ ║ ║ ║ ╚══════► 2: 04H  1=Extended BIOS area allocated
               ║ ║ ║ ║ ╚════════► 3: 08H  1=wait for ext event supported
               ║ ║ ║ ╚══════════► 4: 10H  1=INT 15H 4fH supported by INT 09H
               ║ ║ ╚════════════► 5: 20H  1=real-time clock is present
               ║ ╚══════════════► 6: 40H  second interrupt chip is present
               ╚════════════════► 7: 80H  hard disk BIOS uses DMA chnl 3

   +6      1  rFeatures2 (reserved)
   +7      1  rFeatures3 (reserved)
   +8      1  rFeatures4 (reserved)
   +9      1  rFeatures5 (reserved)
          10             size of this structure

See Also: INT 15H (extended AT services)
          BIOS Data Area
          ROM-BIOS Functions
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