#x86-16 machine code, IBM PC DOS, 14 12 bytes

Binary:

00000000: b401 cd21 f7d9 78f8 cd29 ebf4 ...!..x..).. 

Unassembled:

 START: B4 01 MOV AH, 1 ; DOS read char from STDIN CD 21 INT 21H ; put char in AL F7 D9 NEG CX ; toggle CX sign 78 F8 JS START ; if negative, loop to next char CD 29 INT 29H ; DOS write char to screen again EB F1 JMP START ; loop until break/^C 

A standalone executable DOS program. Input via STDIN (pipe or keyboard interactive), output to STDOUT.

Output:

x86-16 machine code, IBM PC DOS, 14 12 bytes

Binary:

00000000: b401 cd21 f7d9 78f8 cd29 ebf4 ...!..x..).. 

Unassembled:

 START: B4 01 MOV AH, 1 ; DOS read char from STDIN CD 21 INT 21H ; put char in AL F7 D9 NEG CX ; toggle CX sign 78 F8 JS START ; if negative, loop to next char CD 29 INT 29H ; DOS write char to screen again EB F1 JMP START ; loop until break/^C 

A standalone executable DOS program. Input via STDIN (pipe or keyboard interactive), output to STDOUT.

Output:

#x86-16 machine code, IBM PC DOS, 14 bytes

Binary:

00000000: b401 cd21 f7d9 78f8 b40e cd10 ebf2 ...!..x....... 

Unassembled:

 START: B4 01 MOV AH, 1 ; DOS read char from STDIN CD 21 INT 21H ; put char in AL F7 D9 NEG CX ; toggle CX sign 78 F8 JS START ; if negative, loop to next char B4 0E  MOV AH, 0EH ; BIOS write char to console CD 10 INT 10H ; write char to screen again EB F1 JMP START ; loop until break/^C 

A standalone executable DOS program. Input via STDIN (pipe or keyboard interactive), output to STDOUT.

Output:

#x86-16 machine code, IBM PC DOS, 14 12 bytes

Binary:

00000000: b401 cd21 f7d9 78f8 cd29 ebf4   ...!..x..).. 

Unassembled:

 START: B4 01 MOV AH, 1 ; DOS read char from STDIN CD 21 INT 21H ; put char in AL F7 D9 NEG CX ; toggle CX sign 78 F8 JS START ; if negative, loop to next char CD 29 INT 29H ; DOS write char to screen again EB F1 JMP START ; loop until break/^C 

A standalone executable DOS program. Input via STDIN (pipe or keyboard interactive), output to STDOUT.

Output: