Int 21/AX=4456h

DR DOS 5.0+ - HISTORY BUFFER CONTROL

AX = 4456h
DL = control flags (see #01582)

Return:
AL = previous value of state flags (see #01583)

Note: DR DOS 6.0 only checks bit 0 and ignores the rest of DL

See Also: #01584


Bitfields for control flags:

Bit(s)  Description     (Table 01582)
0      whose buffer:
0=application, 1=COMMAND.COM
---Novell DOS 7---
1      toggle HISTORY usage
2      toggle INSERT state

Note: Only one bit at a time may be used


Bitfields for state flags:

Bit(s)  Description     (Table 01583)
0      HISTORY buffer enabled
1      INSERT enabled
2-5    unused
7      whose buffer:
0=application, 1=COMMAND.COM

Category: Other Operating Systems - Int 21h - D

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