Sorry, minor correction on results.
> On Mar 22, 2016, at 9:06 PM, Jerome Shidel <jer...@shidel.net> wrote:
>
> Hello Eric (and anyone else who is interested),
>
> Here is a little proof-of-concept demonstration of the issue regarding I/O
> redirection in DOSBox.
>
> ; begin example code
>
> ; NASM 2.11.08 for DOS
> ; Jerome Shidel, Public Domain.
>
> use16
>
> cpu 8086
>
> org 0x100
>
> StdPassThru:
> mov ah, 0x0b ; DOS Check Standard Input Status
> int 0x21
> cmp al, 0x00 ; 0x00 = no character available, 0xff = present.
> je NoInput
> mov ah, 0x08 ; DOS Get character from STDIN, no echo. AL =
> Character
> int 0x21
> mov ah, 0x02 ; DOS Write DL character to STDOUT.
> mov dl, al
> int 0x21
> jmp StdPassThru
>
> NoInput:
> mov ax, 0x4c00 ; DOS Terminate, no error code
> int 0x21
>
> ; end example code
>
> Compile with nasm PASSTHRU.ASM -fbin -o PASSTHRU.COM <http://passthru.com/>
>
> Run in default DOSBox:
>
> type passthru.asm | passthru.com <http://passthru.com/>
> Result garbage line of text.
Text goes immediately to STDOUT and does not go through PASSTHRU.COM
<http://passthru.com/>.
(Sorry, I was running type passthru.com | passthru.com)
>
> Run under FreeCOM shell inside DOSBox
>
> C:\FDOS\BIN\command.com <http://command.com/>
> type passthru.asm | passthru.com <http://passthru.com/>
>
> result: .Text scrolls by, then infinite number of blank characters and
> occasional
> control characters.
>
> Run on real (or virtual machine of) FreeDOS, MS-DOS, PC-DOS….
>
> text of PASSTHRU.ASM is output and program terminates.
------------------------------------------------------------------------------
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