System BIOS for IBM PC/XT/AT computers and compatibles: the complete guide to ROM-based system software
Part of the Phoenix Technical Reference Series, this book represents the first time that comprehensive documentation of the ROM BIOS of the PC/XT/AT computers and compatibles has been widely available to all IBM PC programmers and developers.
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The ROM BlOS
BlOS Memory Usage
System BlOS Functions and BlOS Diversity
67 other sections not shown
active Bit adapter BlOSs Byte caller Carry Flag Character Codes chip color registers compatible cont'd coprocessor cursor cylinder data definitions Description This function device Disk Status 40:74h Diskette controller diskette drive Diskette Service display Drive number drive type Enable error codes fixed disk controller fixed disk drive Fixed Disk Service Fixed Disk Status Function is supported function returns graphics modes hardware Input interrupt vector table keyboard l/O Address Description l/O port lndex lnitialize lnput/Output lnput lNT 09h lNT 15h memory operating system Output overscan parity PC/XT power-on self test protected mode Read Read/Write Status l/O Real Time Clock Reserved Bit reset ROM BlOS Scan Codes scan lines Select Serial Communications serial port specified Status l/O Address status register subfunction system board text mode time-out Timer video mode