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Rev 1873 Rev 1874
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; set DS to the original PSP
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; set DS to the original PSP
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mov ds, bx
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mov ds, bx
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; load the pointer to the JFT, save it on stack, and set DS to the JFT seg
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; load the pointer to the JFT, save it on stack, and set DS to the JFT seg
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mov bx, [0x34] ; offset
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lds bx, [0x34]  ; loads offset at [0x34] into BX and segment at [0x36] into DS
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mov ds, [0x36] ; seg
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                ; same as "mov bx, [0x34]" + "mov ds, [0x36]", but smaller
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push ds
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push ds
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push bx
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push bx
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; save the original process stdin and stdout on stack
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; save the original process stdin and stdout (at [BX]) on stack
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mov dx, [bx]   ; original stdin and stdout (from the JFT)
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push word [bx]  ; original stdin and stdout (from the JFT)
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push dx
 - 
 
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; overwrite the original process stdin and stdout with stderr, in case stdout
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; overwrite the original process stdin and stdout with stderr, in case stdout
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; or stdin was redirected.
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; or stdin was redirected.
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mov dl, [bx+2]   ; the process stderr (3rd entry of the JFT in original PSP)
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mov dl, [bx+2]   ; the process stderr (3rd entry of the JFT in original PSP)
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mov dh, dl       ; dup DL so I can overwrite stdin and stdout with one write
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mov dh, dl       ; dup DL so I can overwrite stdin and stdout with one write