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USEDEFAULTCOMSPEC:
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USEDEFAULTCOMSPEC:
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; prepare the exec param block
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; prepare the exec param block
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mov ax, [ENVSEG]
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mov ax, [ENVSEG]
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mov [EXEC_PARAM_REC], ax
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mov [EXEC_PARAM_REC], ax
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mov ax, CMDTAIL
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mov [EXEC_PARAM_REC+2], dx
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mov [EXEC_PARAM_REC+2], ax
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mov [EXEC_PARAM_REC+4], es
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mov [EXEC_PARAM_REC+4], cs
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; execute command.com
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; execute command.com
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mov ax, 0x4B00         ; DOS 2+ - load & execute program
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mov ax, 0x4B00         ; DOS 2+ - load & execute program
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push es                ;
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push es                ;
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pop ds                 ;
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pop ds                 ;
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int 0x21
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int 0x21
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; back to program start
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; back to program start
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jmp skipsig
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jmp skipsig
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; command.com tail arguments, in PSP format (length byte followed by arg)
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CMDTAIL db 0
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; ExecParamRec used by INT 21h, AX=4b00 (load and execute program), 14 bytes:
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; ExecParamRec used by INT 21h, AX=4b00 (load and execute program), 14 bytes:
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;  offset  size  content
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;  offset  size  content
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;     +0     2   segment of environment for child (0 = current)
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;     +0     2   segment of environment for child (0 = current)
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;     +2     4   address of command line to place at PSP:0080
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;     +2     4   address of command line to place at PSP:0080
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;     +6     4   address of an FCB to be placed at PSP:005c
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;     +6     4   address of an FCB to be placed at PSP:005c