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AX = 3701h DL = new switch character
Return:
AL = status 00h successful FFh unsupported subfunction
Notes: Documented in some OEM versions of some releases of DOS; DOS 2.x had a SWITCHAR=c setting in CONFIG.SYS. Supported by OS/2 compatibility box and Novell DOS 7. Ignored by MS-DOS 5+ and DR DOS 3.41-6.0; DR DOS 6.0 and Novell DOS 7 leave AX unchanged
See Also: AX=3700h
Category: DOS Kernel - Int 21h - D
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