Revision as of 02:20, 13 July 2022 edit IT-Compiler (talk \| contribs) 84 edits MS-DOS 4.0 has the HEX value 00 00 in this field. The first DOS Version that has an entry is MS-DOS 5.0 it shows 05 00, MS-DOS 6 is 06 00, MS-DOS 6.2 = 06 14, MS-DOS 6.22 = 06 16, FreeDOS 1.3 = 07 0A (for MS-DOS 7.1 the last version of Win9x/ME) ← Previous edit		Revision as of 14:33, 28 May 2023 edit undo RegisteredUser1234 (talk \| contribs) 42 edits Added technical information Next edit →
Line 138: </syntaxhighlight> In DOS 1.x, it was necessary for the CS (Code Segment) register to contain the same segment as the PSP at program termination, thus standard programming practice involved saving the DS register ~~to the stack at program start~~ (since the DS register is loaded with the PSP segment) along with a zero word to the stack at program start and terminating the program with a RETF instruction, which would pop the saved segment value off the stack and jump to address 0 of the PSP, which contained an INT 20h instruction. <syntaxhighlight lang="nasm">

Program Segment Prefix: Difference between revisions