首先,Int 21h功能(功能34h)通过ES:BX寄存器返回一个指针,该指针指向一个 DOS忙碌标志,我们称此标志为InDOS标志。此标志是深藏在操作系统内核中的一个单 字节。不管Int 21h功能何时启动,此标志都减去1;当这一功能终止时,该标志001。当该标 志为0时,就表示没有执行任何DOS功能。 无论什么时候按下TSR的热键,它...
/* find.c This search program locates file names in the directory structure of a hard disk. It illustrates the use of the DOS directory functions from a high-level language. */ int argc; char *argv[]; { int i; for(i=1; i<argc; i++) depth_search(" " , argv[i]); } 使用...
EBX = new size in K Return: AX = 0001h success = 0000h failure BL = status (80h,81h,A0h-A2h,ABh) (see below) Notes: HIMEM.SYS requires at least 256 bytes free stack space the XMS driver need not implement functions 10h through 12h to be considered compliant with the standard Format...
DOS users had a tough time operating the command line system, which required them to type letter code commands to perform computer functions. On the contrary, the graphical user interface (GUI) helped Windows users perform tasks effortlessly by moving a pointer and selecting the displayed graphical...
Someone recently asked an interesting question: Why do Microsoft C and compatible DOS compilers have no truncate() and/or ftruncate() library functions? And how does one resize files on DOS? OK, that’s actually two questions. The first one is easy enough … Continue reading → Posted in ...
This is where I'll put my custom scripts/functions that might be useful in future projects of mine. windowsmacoslinuxbashzshdebianapplescriptubuntufedoraposixps1batchshmsdosscpt UpdatedDec 24, 2024 PowerShell A Javascript scripting engine for DOS ...
Kernel.The DOSkernelfunctions as the brain of the OS; it manages the computer's fundamental operations (memory allocation, file access, etc.) and provides an interface for the computer and its programs to interact with each other. Data recovery capabilities.Booting a computer from the DOS can ...
The encoding of keyboard events as returned by EKEY are simply the 16-bit values the BIOS keyboard interrupt (hex 16) functions give.The duration of a system clock tick for MS is 55 milliseconds.A R/O fam is 0, a W/O fam is 1, and a R/W fam is 2. BIN leaves these values ...
It features an i80486 disassembler, an i8086 assembler, 'Trace into' and 'Step over' functions, simple breakpoint handling, extended code or data navigation, simple color-highlighting, and a nice menu-driven interface comparable to Borland's Turbo Debugger. System requirementsIntel i8086/88 ...
Special Memory Locations in MS-DEBUG There will always be somecodeanddataplaced within the first 256 bytes of the Segment for DEBUG's own use. And although DEBUG often functions as expected if you zero-out this area, there may be some cases where you wouldn't want to alter its contents....