Re: A86: Hiding Programs

To: assembly-86@lists.ticalc.org
Subject: Re: A86: Hiding Programs
From: Chris Phelps <chicane@reninet.com>
Date: Fri, 23 Apr 1999 17:14:14 -0700
Delivered-To: assembly-86-outgoing@towerguard.unix.edu.sollentuna.se
Delivered-To: assembly-86@lists.ticalc.org
In-Reply-To: <19990423205446.1935.rocketmail@web214.mail.yahoo.com>
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>If the first character of a program is less than 'A',
>then it is not detected by any shells or the os.  To
>hide a program like this, use this routine (it isn't
>tested):

Eh...Not exactly.
MSE, ASE, YAS, and most others will detect this program ($00,"rog").
As I am the author of MSE/ZAP-OS, i can tell you that neither will detect
programs that start with [sqrt],'!','#',or 'mse'.

> ld hl,progname-1
> rst 20h
> rst 10h

ld	a,b
ex	de,hl

> ld de,6
> add hl,de    ;point hl to first character in VAT
> ld (hl),0
>
>progname:
> .db 4,"prog"     ;length followed by name
>
>This routine changes the program's name to:
> .db 0,"rog"
>
Actually, its .db $04,$00,"rog"


Chicane
chicane@reninet.com
http://zapo.calc.org

Follow-Ups:

Re: A86: Hiding Programs

From: Nicolas P Zagorin <ziggy2282@juno.com>

References:

Re: A86: Hiding Programs

From: Ben Mickle <bmickle@yahoo.com>