Path: utzoo!utgpu!watserv1!watmath!att!tut.cis.ohio-state.edu!cs.utexas.edu!usc!snorkelwacker!ai-lab!rice-chex!bson
From: bson@rice-chex.ai.mit.edu (Jan Brittenson)
Newsgroups: comp.sys.handhelds
Subject: Re: (none)
Message-ID: <10569@life.ai.mit.edu>
Date: 11 Sep 90 05:32:45 GMT
References: <9009110202.AA29557@hilbert.math.ksu.edu>
Sender: news@ai.mit.edu
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In article <9009110202.AA29557@hilbert.math.ksu.edu>
   koslowj@math.ksu.edu (Juergen Koslowski) writes:

 > I also have a question concerning Rick Grevelle's String-to-Code
 > conversion program ... When I try to understand the machine code
 > portion in terms of the mnemonics provided in Alonso Gariepy's
 > processor notes, I get stuck.  I cannot find the instruction DA in
 > those notes.  Someone recently mentioned the lack of the DA
 > instruction in the sass231 assembler package.

   `DA' is not a Saturn instruction, rather it's a pseudo-instruction,
i.e. an assembler directive. DA simply generates a 5-nibble constant.

Thus,
	da	0x4711		; generates the 5-nibble constant 04711h
	da	0x17		; generates the 5-nibble constant 00017h


   What I meant (and I think you're refering to my posting) is that
there is no such thing as "da 0x4711-0x17" which should, supposedly,
generate the 5-nibble constant 046FAh. To subtract two addresses, use
`sub.a' in a suitable form.