By Daniel P. Siewiorek, C. Gordon Bell, Allen Newell
Read Online or Download Computer Structures: Readings and Examples (McGraw-Hill computer science series) PDF
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Extra info for Computer Structures: Readings and Examples (McGraw-Hill computer science series)
Call with: AH AL CH CL DH DL ES:BX =04H =number of sectors = cylinder = sector = head =drive DOH-7FH floppy disk 80H-FFH fixed disk =segment:offset of buffer (see Notes) Returns: Iffunction successful Carry flag =clear AH =OOH AL =number of sectors verified Iffunction unsuccessful Carry flag AH = set =status (see Int 13H Function 01H) Notes: • On PCs, PC/XTs, and PC/ATs with ROM BIOS dated earlier than 11/15/85, ES:BX should point to a valid buffer. • On fixed disks, the upper 2 bits of the 10-bit cylinder number are placed in the upper 2 bits of register CL.
The caller must supply the buffer. • The current video state is altered during a save state operation (AL =OIH). If the requesting program needs to continue in the same video state, it can follow the save state request with an immediate call to restore the video state. • This function is supported on the VGA only. Int lIB Get Equipment Configuration [PC] [AT] [PS/2] Obtains the equipment list code word from the ROM BIOS. Call with: Nothing Returns: AX = equipment list code word Bit(s) Significance 14-15 number ofprinters installed (continued) 51 Bit(s) 13 12 9-11 8 6-7 4-5 2-3 2 1 o Significance = 1 if internal modem installed (PC and XT only) = 1 if serial printer attached (PCjr) = 1 if game adapter installed number ofRS-232 ports installed reserved number offloppy disk drives (if bit 0 = 1) 00 =1 01 =2 10 =3 11 =4 initial video mode 00 reserved 01 40-by-25 color text 10 80-by-25 color text 11 80-by-25 monochrome system board RAM size (PC, see Note) = 16KB 00 01 = 32 KB 10 = 48 KB 11 =64KB = 1 ifpointing device installed (PS/2) = 1 if math coprocessor installed = 1 iffloppy disk drive(s) installed Note: _m _ • Bits 2-3 of the returned value are used only in the ROM BIOS for the original IBM PC with the 64 KB system board and on the PCjr.
Int 13H Function 02H Read Sector [PC] [AT] [PS/2] Reads one or more sectors from disk into memory. Call with: AH AL CH CL DH DL ES:BX =02H =number of sectors =cylinder = sector = head =drive DOH-7FH floppy disk 80H-FFH fixed disk = segment:offset of buffer Returns: Iffunction successful Carry flag = clear AH =OOH AL = number of sectors transferred Iffunction unsuccessful Carry flag =set AH = status (see Int 13H Function 01H) Notes: • On fixed disks, the upper 2 bits of the to-bit cylinder number are placed in the upper 2 bits of register CL.