By Ray Duncan
This consultant addresses key programming issues, together with personality units, mass garage, reminiscence administration and strategy administration. The reference part information every one MS-DOS functionality name and interrupt and the BIOS interrupts. New and extended fabric during this version contains, process services for all present types of MS-DOS, ROM BIOS details for fastened disk, EGA, VGA, PC/AT and PS/2, model 4.0 of the Lotus/Intel/Microsoft increased reminiscence specification, writing "well-behaved" as opposed to "hardware-dependent" purposes, and compatibility concerns for OS/2
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Additional info for Advanced MS DOS programming : the Microsoft guide for Assembly language and C programmers
Program Segments The term segments refers to two discrete programming concepts: physical segments and logical segments. txt Physical segments are 64 KB blocks of memory. The Intel 8086/8088 and 80286 microprocessors have four segment registers, which are essentially used as pointers to these blocks. ) Each segment register can point to the bottom of a different 64 KB area of memory. Thus, a program can address any location in memory by appropriate manipulation of the segment registers, but the maximum amount of memory that it can address simultaneously is 256 KB.
17# 46 47 DATA . . . . . . . txt LF . . . . . . . . 18# 46 47 MSG. . . . . . . . 33 46# MSG_LEN. . . . . . . 32 49# PRINT. . . . . . . 25# 39 60 STACK. . . . . . . 23 54# 54 STDERR . . . . . . . 15# STDIN. . . . . . . 13# STDOUT . . . . . . . 14# 31 58 _DATA. . . . . . . 23 27 _TEXT. . . . . . . 21# 23 51 44# 41 15 Symbols —————————————————————————————————————————————————————————————————————————— Figure 4-5.
14# 31 58 _DATA. . . . . . . 23 27 _TEXT. . . . . . . 21# 23 51 44# 41 15 Symbols —————————————————————————————————————————————————————————————————————————— Figure 4-5. EXE program example from Chapter 3. The symbols declared in the program are listed on the left in alphabetic order. To the right of each symbol is a list of all the lines where that symbol is referenced. The number with a # sign after it denotes the line where the symbol is declared. Numbers followed by a + sign indicate that the symbol is modified at the specified line.
Advanced MS DOS programming : the Microsoft guide for Assembly language and C programmers by Ray Duncan