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Line 11: Handles 0-2 are connected to the console device. During program execution they can get modified (closed, redirected) like any other handle. Because the size of the JFT in the PSP is limited to 20 bytes, you could originally only open 15 files (20-5 standard devices). As of MS-DOS 2.0 the Extended Job File Table was introduced, which allowed ~~to open~~ up to 254 files to be opened. As of MS-DOS 3.30 the size of the JFT can be modified with a call to INT 21h, 67h.

Job File Table: Difference between revisions