tailieunhanh - Cracker Handbook 1.0 part 64

Tham khảo tài liệu 'cracker handbook part 64', công nghệ thông tin, kỹ thuật lập trình phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Use Sets parallel port. Call registers AH 01H DX Port to use Return registers AH Printer status Port to use is defined in the DX register for example LPT 0 LPT2 1 and so on. The state of the printer is coded bit by bit as follows BIT 1 0 MEANING 0 1 The waited time is over 1 - 2 - 3 1 input output error 4 1 Chosen printer 5 1 out-of-paper 6 1 communication recognized 7 1 The printer is ready to use 1 and 2 bits are not relevant Most BIOS sport 3 parallel ports although there are BIOS which sport 4 parallel ports. 02h Function Uses Gets the printer status. Call registers AH 01H DX Port to use Return registers AH Printer status. Port to use is defined in the DX register for example LPT 0 LPT2 1 and so on The state of the printer is coded bit by bit as follows BIT 1 0 MEANING 0 1 The waited time is over 1 - 2 - 3 1 input output error 4 1 Chosen printer 5 1 out-of-paper 6 1 communication recognized 7 1 The printer is ready to use 1 and 2 bits are not relevant Most BIOS sport 3 parallel ports although there are BIOS which sport 4 parallel ports. Ways of working with files There are two ways to work with files the first one is by means of file control blocks or FCB and the second one is by means of communication channels also known as handles . The first way of file handling has been used since the CPM operative system predecessor of DOS thus it assures certain compatibility with very old files from the CPM as well as from the version of the DOS besides this method allows us to have an unlimited number of open files at the same time. If you want to create a volume for the disk the only way to achieve this is by using this method. Even after considering the advantages of the FCB the use of the communication channels it is much simpler and it allows us a better handling of errors besides since it is much newer it is very probable that the files created this way maintain themselves compatible through later versions of the operative system. For a greater facility on