Re: A86: _exec_basic

To: assembly-86@lists.ticalc.org
Subject: Re: A86: _exec_basic
From: ComAsYuAre@aol.com
Date: Wed, 1 Mar 2000 22:18:42 EST
Reply-To: assembly-86@lists.ticalc.org

In a message dated 3/1/00 9:19:57 PM Eastern Standard Time, rabidcow@juno.com 
writes:

> _PARSEINP uses __bank_call, which should return the proper rom page,
>  right?
>  _PARSEOFF does the same thing as _PARSEINP, except it doesn't reset some
>  flags first.  does this one work?
>  what causes the syntax error?

It doesn't give me a syntax error with the following code.  However, if I 
enable the error handler it crashes after I exit the asm prog (though while 
in it everything works fine).  Probably not restoring a stack or something.

 ld hl,ErrorHandler
 call _pushErrorHandler
 ld hl,_PARSEVAR
 ld de,BasicBackup          ;free memory
 ld bc,_LASTENTRYPTR-_PARSEVAR
 push bc
 push de
 push hl
 ldir
 ld hl,(_OPS)
 ld (_OPBASE),hl
 ld hl,(_FPS)
 ld (_FPBASE),hl
 call _PARSEINP         ;_exec_basic
 call _runIndicOff
 pop de
 pop hl
 pop bc
 ldir
 call _popErrorHandler
;...

ErrorSyntax = 135
ErrorUndefined = 142

ErrorHandler:
 cp ErrorSyntax
 jr z,TrapError
 cp ErrorUndefined
 jp nz,_monErrHand          ;default error handler
TrapError:
 ld hl,BasicBackup
 ld de,_PARSEVAR
 ld bc,_LASTENTRYPTR-_PARSEVAR
 ldir
 call _popErrorHandler
 ld sp,0
StackSave = $-2
 call _OP3TOOP1
 ld a,$d
 out (5),a
 jp Reload

----
Jonah Cohen
<ComAsYuAre@aol.com>
http://linux.hypnotic.org/~jonah/ (down)