Rocksolid Light - alt.lang.asm

Rot13 for DOS

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From: admin@nospicedham.127.0.0.1 (Kerr-Mudd, John)
Newsgroups: comp.os.msdos.programmer,comp.lang.asm.x86,alt.lang.asm
Subject: Rot13 for DOS
Date: Sun, 22 Jan 2023 09:24:40 +0000
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by: Kerr-Mudd, John - Sun, 22 Jan 2023 09:24 UTC

Finally, a rot13 program for DOS that's smaller than the standard version
with jumps:

->u 100 l2E
1637:0100 B6 02 mov dh,02
1637:0102 B4 3F mov ah,3F
1637:0104 89 C1 mov cx,ax
1637:0106 CD 21 int 21
1637:0108 89 D6 mov si,dx
1637:010A 91 xchg ax,cx
1637:010B E3 20 jcxzw 012D
1637:010D 51 push cx
1637:010E AC lodsb
; main rot13 rtn
1637:010F 24 DF and al,DF
1637:0111 2C 41 sub al,41
1637:0113 3C 1A cmp al,1A
1637:0115 18 E4 sbb ah,ah
1637:0117 3C 0D cmp al,0D
1637:0119 D6 salc
1637:011A 25 1A F3 and ax,F31A
1637:011D 00 E0 add al,ah
1637:011F 00 44 FF add [si-01],al

1637:0122 E2 EA loopw 010E
1637:0124 59 pop cx
1637:0125 43 inc bx
1637:0126 B4 40 mov ah,40
1637:0128 CD 21 int 21
1637:012A 4B dec bx
1637:012B EB D5 jmp 0102
1637:012D C3 ret
-> d 100 l2E
1637:0100 B6 02 B4 3F-89 C1 CD 21-89 D6 91 E3-20 51 AC 24 ...?...!.... Q.$
1637:0110 DF 2C 41 3C-1A 18 E4 3C-0D D6 25 1A-F3 00 E0 00 .,A<...<..%.....
1637:0120 44 FF-E2 EA 59 43-B4 40 CD 21-4B EB D5 C3 D...YC.@.!K...
-> q

--
Bah, and indeed Humbug.

Re: Rot13 for DOS

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From: terje.mathisen@nospicedham.tmsw.no (Terje Mathisen)
Newsgroups: comp.os.msdos.programmer,comp.lang.asm.x86,alt.lang.asm
Subject: Re: Rot13 for DOS
Date: Wed, 25 Jan 2023 15:03:26 +0100
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by: Terje Mathisen - Wed, 25 Jan 2023 14:03 UTC

Kerr-Mudd, John wrote:
> Finally, a rot13 program for DOS that's smaller than the standard version
> with jumps:
>
>
> ->u 100 l2E
> 1637:0100 B6 02 mov dh,02
> 1637:0102 B4 3F mov ah,3F
> 1637:0104 89 C1 mov cx,ax
> 1637:0106 CD 21 int 21
> 1637:0108 89 D6 mov si,dx
> 1637:010A 91 xchg ax,cx
> 1637:010B E3 20 jcxzw 012D
> 1637:010D 51 push cx

The loop starts here of course!

> 1637:010E AC lodsb
> ; main rot13 rtn
> 1637:010F 24 DF and al,DF
Folding to lowercase ascii
> 1637:0111 2C 41 sub al,41
> 1637:0113 3C 1A cmp al,1A
Checking that it was in-range
> 1637:0115 18 E4 sbb ah,ah
> 1637:0117 3C 0D cmp al,0D

Very nice, handling plus/minus for upper and lower case!

> 1637:0119 D6 salc
> 1637:011A 25 1A F3 and ax,F31A
> 1637:011D 00 E0 add al,ah
> 1637:011F 00 44 FF add [si-01],al
>
> 1637:0122 E2 EA loopw 010E
> 1637:0124 59 pop cx
> 1637:0125 43 inc bx
> 1637:0126 B4 40 mov ah,40
> 1637:0128 CD 21 int 21
> 1637:012A 4B dec bx
> 1637:012B EB D5 jmp 0102
> 1637:012D C3 ret
> -> d 100 l2E
> 1637:0100 B6 02 B4 3F-89 C1 CD 21-89 D6 91 E3-20 51 AC 24 ...?...!.... Q.$
> 1637:0110 DF 2C 41 3C-1A 18 E4 3C-0D D6 25 1A-F3 00 E0 00 .,A<...<..%.....
> 1637:0120 44 FF-E2 EA 59 43-B4 40 CD 21-4B EB D5 C3 D...YC.@.!K...
> -> q
>

Re: Rot13 for DOS

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From: admin@nospicedham.127.0.0.1 (Kerr-Mudd, John)
Newsgroups: comp.os.msdos.programmer,comp.lang.asm.x86,alt.lang.asm
Subject: Re: Rot13 for DOS
Date: Wed, 25 Jan 2023 17:02:43 +0000
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by: Kerr-Mudd, John - Wed, 25 Jan 2023 17:02 UTC

On Wed, 25 Jan 2023 15:03:26 +0100
Terje Mathisen <terje.mathisen@nospicedham.tmsw.no> wrote:

> Kerr-Mudd, John wrote:
> > Finally, a rot13 program for DOS that's smaller than the standard version
> > with jumps:
> >
> >
> > ->u 100 l2E
> > 1637:0100 B6 02 mov dh,02
;dirty save of 1 byte by not fully specifying the IOAREA

> > 1637:0102 B4 3F mov ah,3F
> > 1637:0104 89 C1 mov cx,ax
;dirty save of 1 byte by not fully specifying the IOAREA_Lth

> > 1637:0106 CD 21 int 21
> > 1637:0108 89 D6 mov si,dx
> > 1637:010A 91 xchg ax,cx
> > 1637:010B E3 20 jcxzw 012D
> > 1637:010D 51 push cx
>
> The loop starts here of course!
>
> > 1637:010E AC lodsb
> > ; main rot13 rtn
> > 1637:010F 24 DF and al,DF
> Folding to lowercase ascii
> > 1637:0111 2C 41 sub al,41
> > 1637:0113 3C 1A cmp al,1A
> Checking that it was in-range
> > 1637:0115 18 E4 sbb ah,ah
> > 1637:0117 3C 0D cmp al,0D
>
> Very nice, handling plus/minus for upper and lower case!
>
> > 1637:0119 D6 salc
> > 1637:011A 25 1A F3 and ax,F31A
> > 1637:011D 00 E0 add al,ah
> > 1637:011F 00 44 FF add [si-01],al
> >
> > 1637:0122 E2 EA loopw 010E
> > 1637:0124 59 pop cx
> > 1637:0125 43 inc bx
> > 1637:0126 B4 40 mov ah,40
> > 1637:0128 CD 21 int 21
> > 1637:012A 4B dec bx
> > 1637:012B EB D5 jmp 0102

> > 1637:012D C3 ret
> > -> d 100 l2E
> > 1637:0100 B6 02 B4 3F-89 C1 CD 21-89 D6 91 E3-20 51 AC 24 ...?...!.... Q.$
> > 1637:0110 DF 2C 41 3C-1A 18 E4 3C-0D D6 25 1A-F3 00 E0 00 .,A<...<..%.....
> > 1637:0120 44 FF-E2 EA 59 43-B4 40 CD 21-4B EB D5 C3 D...YC.@.!K...
> > -> q
> >
>

TYVM, It's appreciated, especially from you.

simpler? version; hardcoded IOAREA, rotamt in dl
->u 100 l2E
1637:0100 BA 0D 1A mov dx,1A0D
1637:0103 B4 3F mov ah,3F
1637:0105 89 C1 mov cx,ax
1637:0107 CD 21 int 21
1637:0109 89 D6 mov si,dx
1637:010B 91 xchg ax,cx
1637:010C E3 1F jcxzw 012D
1637:010E 51 push cx
1637:010F AC lodsb

1637:0110 24 DF and al,DF
1637:0112 2C 41 sub al,41
1637:0114 38 D0 cmp al,dl
1637:0116 18 E4 sbb ah,ah
1637:0118 38 F0 cmp al,dh
1637:011A D6 salc
1637:011B 21 D0 and ax,dx
1637:011D 28 C4 sub ah,al
1637:011F 00 64 FF add [si-01],ah

1637:0122 E2 EB loopw 010F
1637:0124 59 pop cx
1637:0125 43 inc bx
1637:0126 B4 40 mov ah,40
1637:0128 CD 21 int 21
1637:012A 4B dec bx
1637:012B EB D6 jmp 0103
1637:012D C3 ret
-> d 100 l2E
1637:0100 BA 0D 1A B4-3F 89 C1 CD-21 89 D6 91-E3 1F 51 AC ....?...!.....Q.
1637:0110 24 DF 2C 41-38 D0 18 E4-38 F0 D6 21-D0 28 C4 00 $.,A8...8..!.(..
1637:0120 64 FF E2 EB-59 43 B4 40-CD 21 4B EB-D6 C3 d...YC.@.!K...
-> q

Sad there's no^w little interest in x86 asm these days, but I suppose such
things might have been "hot" 40 years ago.

(Modesty forbids me from adding "me too!")

--
Bah, and indeed Humbug.

Re: Rot13 for DOS

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From: admin@nospicedham.127.0.0.1 (Kerr-Mudd, John)
Newsgroups: comp.os.msdos.programmer,comp.lang.asm.x86,alt.lang.asm
Subject: Re: Rot13 for DOS
Date: Fri, 27 Jan 2023 09:57:22 +0000
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by: Kerr-Mudd, John - Fri, 27 Jan 2023 09:57 UTC

On Wed, 25 Jan 2023 17:02:43 +0000
"Kerr-Mudd, John" <admin@nospicedham.127.0.0.1> wrote:

> On Wed, 25 Jan 2023 15:03:26 +0100
> Terje Mathisen <terje.mathisen@nospicedham.tmsw.no> wrote:
>
> > Kerr-Mudd, John wrote:
> > > Finally, a rot13 program for DOS that's smaller than the standard version
> > > with jumps:
> > >
>
> simpler? version; hardcoded IOAREA, rotamt in dl
> ->u 100 l2E
> 1637:0100 BA 0D 1A mov dx,1A0D
> 1637:0103 B4 3F mov ah,3F
> 1637:0105 89 C1 mov cx,ax

Nasty hack gave poor use of seg for R/W buffer; replace with
mov ch,E4 ; (ie. FF-1A-1)
[]

->u 100 l2E
1637:0100 BA 0D 1A mov dx,1A0D
1637:0103 B4 3F mov ah,3F
1637:0105 B5 E4 mov ch,E4
1637:0107 CD 21 int 21
1637:0109 89 D6 mov si,dx
1637:010B 91 xchg ax,cx
1637:010C E3 1F jcxzw 012D
1637:010E 51 push cx
1637:010F AC lodsb
1637:0110 24 DF and al,DF
1637:0112 2C 41 sub al,41
1637:0114 38 D0 cmp al,dl
1637:0116 18 E4 sbb ah,ah
1637:0118 38 F0 cmp al,dh
1637:011A D6 salc
1637:011B 21 D0 and ax,dx
1637:011D 28 C4 sub ah,al
1637:011F 00 64 FF add [si-01],ah
1637:0122 E2 EB loopw 010F
1637:0124 59 pop cx
1637:0125 43 inc bx
1637:0126 B4 40 mov ah,40
1637:0128 CD 21 int 21
1637:012A 4B dec bx
1637:012B EB D6 jmp 0103
1637:012D C3 ret
-> d 100 l2E
1637:0100 BA 0D 1A B4-3F B5 E4 CD-21 89 D6 91-E3 1F 51 AC ....?...!.....Q.
1637:0110 24 DF 2C 41-38 D0 18 E4-38 F0 D6 21-D0 28 C4 00 $.,A8...8..!.(..
1637:0120 64 FF-E2 EB 59 43-B4 40 CD 21-4B EB D6 C3 d...YC.@.!K...
-> q
--
Bah, and indeed Humbug.

Re: Rot13 for DOS

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Newsgroups: comp.os.msdos.programmer,comp.lang.asm.x86,alt.lang.asm
Subject: Re: Rot13 for DOS
Date: Fri, 27 Jan 2023 13:30:13 +0000
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by: Kerr-Mudd, John - Fri, 27 Jan 2023 13:30 UTC

On Fri, 27 Jan 2023 09:57:22 +0000
"Kerr-Mudd, John" <admin@nospicedham.127.0.0.1> wrote:

> On Wed, 25 Jan 2023 17:02:43 +0000
> "Kerr-Mudd, John" <admin@nospicedham.127.0.0.1> wrote:
>
[]
> > > Kerr-Mudd, John wrote:
> > > > Finally, a rot13 program for DOS that's smaller than the standard version
> > > > with jumps:
> > > >
> >
> > simpler? version; hardcoded IOAREA, rotamt in dl
> > ->u 100 l2E
> > 1637:0100 BA 0D 1A mov dx,1A0D
> > 1637:0103 B4 3F mov ah,3F
> > 1637:0105 89 C1 mov cx,ax
>
> Nasty hack gave poor use of seg for R/W buffer; replace with
> mov ch,E4 ; (ie. FF-1A-1)
> []
[]
'Better' still use C3 (embedded 'ret') to reduce prog to 45 bytes.

->u 100 l2D
1637:0100 BA 0D 1A mov dx,1A0D
1637:0103 B4 3F mov ah,3F
1637:0105 B5 C3 mov ch,C3
1637:0107 CD 21 int 21
1637:0109 89 D6 mov si,dx
1637:010B 91 xchg ax,cx
1637:010C E3 F8 jcxzw 0106
1637:010E 51 push cx
1637:010F AC lodsb
1637:0110 24 DF and al,DF
1637:0112 2C 41 sub al,41
1637:0114 38 D0 cmp al,dl
1637:0116 18 E4 sbb ah,ah
1637:0118 38 F0 cmp al,dh
1637:011A D6 salc
1637:011B 21 D0 and ax,dx
1637:011D 28 C4 sub ah,al
1637:011F 00 64 FF add [si-01],ah
1637:0122 E2 EB loopw 010F
1637:0124 59 pop cx
1637:0125 43 inc bx
1637:0126 B4 40 mov ah,40
1637:0128 CD 21 int 21
1637:012A 4B dec bx
1637:012B EB D6 jmp 0103
-> d 100 l2D
1637:0100 BA 0D 1A B4-3F B5 C3 CD-21 89 D6 91-E3 F8 51 AC ....?...!.....Q.
1637:0110 24 DF 2C 41-38 D0 18 E4-38 F0 D6 21-D0 28 C4 00 $.,A8...8..!.(..
1637:0120 64-FF E2 EB 59-43 B4 40 CD-21 4B EB D6 d...YC.@.!K..
-> q

--
Bah, and indeed Humbug.

Re: Rot13 for DOS

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From: admin@nospicedham.127.0.0.1 (Kerr-Mudd, John)
Newsgroups: comp.os.msdos.programmer,comp.lang.asm.x86,alt.lang.asm
Subject: Re: Rot13 for DOS
Date: Sat, 18 Nov 2023 11:10:20 +0000
Organization: Dis
Lines: 115
Approved: fbkotler@myfairpoint.net - comp.lang.asm.x86 moderation team.
Message-ID: <20231118111020.57b5f1750a20a70720a3534f@127.0.0.1>
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by: Kerr-Mudd, John - Sat, 18 Nov 2023 11:10 UTC

On Fri, 27 Jan 2023 13:30:13 +0000
"Kerr-Mudd, John" <admin@nospicedham.127.0.0.1> wrote:

> On Fri, 27 Jan 2023 09:57:22 +0000
> "Kerr-Mudd, John" <admin@nospicedham.127.0.0.1> wrote:
>
> > On Wed, 25 Jan 2023 17:02:43 +0000
> > "Kerr-Mudd, John" <admin@nospicedham.127.0.0.1> wrote:
> >
> []
> > > > Kerr-Mudd, John wrote:
> > > > > Finally, a rot13 program for DOS that's smaller than the standard version
> > > > > with jumps:
> > > > >
[]
> 'Better' still use C3 (embedded 'ret') to reduce prog to 45 bytes.
[]
One that works even if the rot amount isn't 13 (ie the older version
didn't!) also 45 bytes:

->u 100 l2D
16AD:0100 BA E6 0D mov dx,0DE6
16AD:0103 B4 3F mov ah,3F
16AD:0105 B5 C3 mov ch,C3
16AD:0107 CD 21 int 21
16AD:0109 91 xchg ax,cx
16AD:010A E3 FA jcxzw 0106

16AD:010C 89 D6 mov si,dx
16AD:010E 51 push cx

16AD:010F AC lodsb
16AD:0110 24 DF and al,DF
16AD:0112 2C 41 sub al,41
16AD:0114 2C 1A sub al,1A
16AD:0116 18 E4 sbb ah,ah
16AD:0118 00 F0 add al,dh
16AD:011A D6 salc
16AD:011B 21 D0 and ax,dx
16AD:011D 00 E0 add al,ah
16AD:011F 00 64 FF add [si-01],ah
16AD:0122 E2 EB loopw 010F

16AD:0124 59 pop cx
16AD:0125 43 inc bx
16AD:0126 B4 40 mov ah,40
16AD:0128 CD 21 int 21
16AD:012A 4B dec bx
16AD:012B EB D6 jmp 0103

-> d 100 l2D
16AD:0100 BA E6 0D B4-3F B5 C3 CD-21 91 E3 FA-89 D6 51 AC ....?...!.....Q.
16AD:0110 24 DF 2C 41-2C 1A 18 E4-00 F0 D6 21-D0 00 E0 00 $.,A,......!....
16AD:0120 64-FF E2 EB 59-43 B4 40 CD-21 4B EB D6 d...YC.@.!K..
-> q

And a version that allows the rot amount as a parameter in 64 bytes:
example usage:
rot 3<input.txt

->u 100 l40
16AD:0100 BA E6 0D mov dx,0DE6
16AD:0103 BE 82 00 mov si,0082
16AD:0106 AD lodsw
16AD:0107 2D 30 30 sub ax,3030
16AD:010A 72 04 jb 0110
16AD:010C 86 E0 xchg ah,al
16AD:010E D5 0A aad 0A
16AD:0110 3C 00 cmp al,00
16AD:0112 72 02 jb 0116
16AD:0114 88 C6 mov dh,al

16AD:0116 B4 3F mov ah,3F
16AD:0118 B5 C3 mov ch,C3
16AD:011A CD 21 int 21
16AD:011C 91 xchg ax,cx
16AD:011D E3 FA jcxzw 0119

16AD:011F 89 D6 mov si,dx
16AD:0121 51 push cx

16AD:0122 AC lodsb
16AD:0123 24 DF and al,DF
16AD:0125 2C 41 sub al,41
16AD:0127 2C 1A sub al,1A
16AD:0129 18 E4 sbb ah,ah
16AD:012B 00 F0 add al,dh
16AD:012D D6 salc
16AD:012E 21 D0 and ax,dx
16AD:0130 00 E0 add al,ah
16AD:0132 00 44 FF add [si-01],al
16AD:0135 E2 EB loopw 0122

16AD:0137 59 pop cx
16AD:0138 43 inc bx
16AD:0139 B4 40 mov ah,40
16AD:013B CD 21 int 21
16AD:013D 4B dec bx
16AD:013E EB D6 jmp 0116

-> d 100 l40
16AD:0100 BA E6 0D BE-82 00 AD 2D-30 30 72 04-86 E0 D5 0A .......-00r.....
16AD:0110 3C 00 72 02-88 C6 B4 3F-B5 C3 CD 21-91 E3 FA 89 <.r....?...!....
16AD:0120 D6 51 AC 24-DF 2C 41 2C-1A 18 E4 00-F0 D6 21 D0 .Q.$.,A,......!.
16AD:0130 00 E0 00 44-FF E2 EB 59-43 B4 40 CD-21 4B EB D6 ...D...YC.@.!K..
-> q

--
Bah, and indeed Humbug.

Re: Rot13 for DOS

<20231118161614.e39093a64c0be6c395447717@127.0.0.1>

copy mid

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From: admin@nospicedham.127.0.0.1 (Kerr-Mudd, John)
Newsgroups: comp.os.msdos.programmer,comp.lang.asm.x86,alt.lang.asm
Subject: Re: Rot13 for DOS
Date: Sat, 18 Nov 2023 16:16:14 +0000
Organization: Dis
Lines: 77
Approved: fbkotler@myfairpoint.net - comp.lang.asm.x86 moderation team.
Message-ID: <20231118161614.e39093a64c0be6c395447717@127.0.0.1>
References: <20221223155428.cffff42388521c7edcc7fc41@127.0.0.1>
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by: Kerr-Mudd, John - Sat, 18 Nov 2023 16:16 UTC

On Sat, 18 Nov 2023 11:10:20 +0000
"Kerr-Mudd, John" <admin@nospicedham.127.0.0.1> wrote:

>
>
> And a version that allows the rot amount as a parameter in 64 bytes:
> example usage:
> rot 3<input.txt
>
> ->u 100 l40

Bah, I knew I shouldn't have posted so soon:

> 16AD:0100 BA E6 0D mov dx,0DE6
Instead of

> 16AD:0103 BE 82 00 mov si,0082
> 16AD:0106 AD lodsw
use:
16AD:0103 A1 82 00 mov ax,[0082]

(and adjust everything else up 1)

> 16AD:0107 2D 30 30 sub ax,3030
> 16AD:010A 72 04 jb 0110
> 16AD:010C 86 E0 xchg ah,al
> 16AD:010E D5 0A aad 0A
> 16AD:0110 3C 00 cmp al,00
> 16AD:0112 72 02 jb 0116
> 16AD:0114 88 C6 mov dh,al
>
> 16AD:0116 B4 3F mov ah,3F
> 16AD:0118 B5 C3 mov ch,C3
> 16AD:011A CD 21 int 21
> 16AD:011C 91 xchg ax,cx
> 16AD:011D E3 FA jcxzw 0119
>
> 16AD:011F 89 D6 mov si,dx
> 16AD:0121 51 push cx
>
> 16AD:0122 AC lodsb
> 16AD:0123 24 DF and al,DF
> 16AD:0125 2C 41 sub al,41
> 16AD:0127 2C 1A sub al,1A
> 16AD:0129 18 E4 sbb ah,ah
> 16AD:012B 00 F0 add al,dh
> 16AD:012D D6 salc
> 16AD:012E 21 D0 and ax,dx
> 16AD:0130 00 E0 add al,ah
> 16AD:0132 00 44 FF add [si-01],al
> 16AD:0135 E2 EB loopw 0122
>
> 16AD:0137 59 pop cx
> 16AD:0138 43 inc bx
> 16AD:0139 B4 40 mov ah,40
> 16AD:013B CD 21 int 21
> 16AD:013D 4B dec bx
> 16AD:013E EB D6 jmp 0116
>
> -> d 100 l40
> 16AD:0100 BA E6 0D BE-82 00 AD 2D-30 30 72 04-86 E0 D5 0A .......-00r.....
> 16AD:0110 3C 00 72 02-88 C6 B4 3F-B5 C3 CD 21-91 E3 FA 89 <.r....?...!....
> 16AD:0120 D6 51 AC 24-DF 2C 41 2C-1A 18 E4 00-F0 D6 21 D0 .Q.$.,A,......!.
> 16AD:0130 00 E0 00 44-FF E2 EB 59-43 B4 40 CD-21 4B EB D6 ...D...YC.@.!K..
> -> q
>
>
>
> --
> Bah, and indeed Humbug.
>

--
Bah, and indeed Humbug.

Re: Rot13 for DOS

<20231118221955.2b2a7ee9784bc03d76e90f94@127.0.0.1>

copy mid

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From: admin@nospicedham.127.0.0.1 (Kerr-Mudd, John)
Newsgroups: comp.os.msdos.programmer,comp.lang.asm.x86,alt.lang.asm
Subject: Re: Rot13 for DOS
Date: Sat, 18 Nov 2023 22:19:55 +0000
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References: <20221223155428.cffff42388521c7edcc7fc41@127.0.0.1>
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by: Kerr-Mudd, John - Sat, 18 Nov 2023 22:19 UTC

On Sat, 18 Nov 2023 11:10:20 +0000
"Kerr-Mudd, John" <admin@nospicedham.127.0.0.1> wrote:

> On Fri, 27 Jan 2023 13:30:13 +0000
> "Kerr-Mudd, John" <admin@nospicedham.127.0.0.1> wrote:
>
> > On Fri, 27 Jan 2023 09:57:22 +0000
> > "Kerr-Mudd, John" <admin@nospicedham.127.0.0.1> wrote:
> >
> > > On Wed, 25 Jan 2023 17:02:43 +0000
> > > "Kerr-Mudd, John" <admin@nospicedham.127.0.0.1> wrote:
> > >
> > []
> > > > > Kerr-Mudd, John wrote:
> > > > > > Finally, a rot13 program for DOS that's smaller than the standard version
> > > > > > with jumps:
> > > > > >
> []
> > 'Better' still use C3 (embedded 'ret') to reduce prog to 45 bytes.
> []
>
> One that works even if the rot amount isn't 13 (ie the older version
> didn't!) also 45 bytes:
>
> ->u 100 l2D
> 16AD:0100 BA E6 0D mov dx,0DE6
> 16AD:0103 B4 3F mov ah,3F
> 16AD:0105 B5 C3 mov ch,C3
> 16AD:0107 CD 21 int 21
> 16AD:0109 91 xchg ax,cx
> 16AD:010A E3 FA jcxzw 0106
>
> 16AD:010C 89 D6 mov si,dx
> 16AD:010E 51 push cx
>
> 16AD:010F AC lodsb
> 16AD:0110 24 DF and al,DF
> 16AD:0112 2C 41 sub al,41
> 16AD:0114 2C 1A sub al,1A
> 16AD:0116 18 E4 sbb ah,ah
> 16AD:0118 00 F0 add al,dh
> 16AD:011A D6 salc
> 16AD:011B 21 D0 and ax,dx
> 16AD:011D 00 E0 add al,ah

> 16AD:011F 00 64 FF add [si-01],ah
Oh bother, make that al:
16AD:011F 00 44 FF add [si-01],al

> 16AD:0122 E2 EB loopw 010F
>
> 16AD:0124 59 pop cx
> 16AD:0125 43 inc bx
> 16AD:0126 B4 40 mov ah,40
> 16AD:0128 CD 21 int 21
> 16AD:012A 4B dec bx
> 16AD:012B EB D6 jmp 0103
>
> -> d 100 l2D
> 16AD:0100 BA E6 0D B4-3F B5 C3 CD-21 91 E3 FA-89 D6 51 AC ....?...!.....Q.
> 16AD:0110 24 DF 2C 41-2C 1A 18 E4-00 F0 D6 21-D0 00 E0 00 $.,A,......!....
> 16AD:0120 64-FF E2 EB 59-43 B4 40 CD-21 4B EB D6 d...YC.@.!K..
-----------^44

> -> q
>
>

(It happens to work, so passes my test but iff rot13)

--
Bah, and indeed Humbug.

grep me no patterns and I'll tell you no lines.

devel / alt.lang.asm / Re: Rot13 for DOS

Subject	Author
Rot13 for DOS	Kerr-Mudd, John
Re: Rot13 for DOS	Terje Mathisen
Re: Rot13 for DOS	Kerr-Mudd, John
Re: Rot13 for DOS	Kerr-Mudd, John
Re: Rot13 for DOS	Kerr-Mudd, John
Re: Rot13 for DOS	Kerr-Mudd, John
Re: Rot13 for DOS	Kerr-Mudd, John
Re: Rot13 for DOS	Kerr-Mudd, John