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From: bson@rice-chex.ai.mit.edu (Jan Brittenson)
Newsgroups: comp.sys.handhelds
Subject: SAD - Saturn Disassembler Beta 1.01
Message-ID: <10712@life.ai.mit.edu>
Date: 15 Sep 90 01:40:01 GMT
Sender: news@ai.mit.edu
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   I have just (sort of) finished a Saturn Disassembler. I would like
a couple of people out there who have previously disassembled parts of
the HP-48SX ROMs to verify that the output is correct by disassembling
previously disassembled areas and comparing the results. If you are
interested in doing this, drop me a line. All others, please hang on
until most bugs are out, and a couple of tools have been added to
update the symbol and comment databases using edited listings as
input, as well as a GNU Emacs mode.

   The preparatory work required is to dump areas of the ROMs into
your UNIX system (DOS users will be on their own here), and convert it
into Core format. SAD consults three databases: Core, Symbols, and
Comments. Only Core is necessary for the verification.


   Included is a sample SAD 1.01 listing ([...] identify comments
inserted by SAD, the rest are picked from the Comments database):


05b79
05b79   ; Allocate string on heap. 
05b79   ; C is to contain the string length, in bytes.
05b79   ; Sets r0 to object header address, and d0 to data address.
05b79   ; Sets mode to hex.
05b79
05b79   stralloc:
05b79 04       sethex
05b7b c6       add.a	c, c		; Bytes to nibbles
05b7d 84a      clrb	#a, st		; No GC performed
05b80 24       move.1	4, p
05b82 809      add.a	p+1, c
05b85 108      move.w	c, r0
05b88 20       move.1	0, p
05b8a 8f60860  call.a	c=free_mem	; [<#6806>]
05b91 da       move.a	c, a
05b93 118      move.w	r0, c
05b96 2f       move.1	15, p
05b98 809      add.a	p+1, c
05b9b 20       move.1	0, p
05b9d 8bed0    brle.a	c, a, stralloc+#34 ; [<#5bad>]
05ba2 8fd3361  call.a	#1633d		; GC?
05ba9 6edf     jump.3	stralloc+#f	; [<#5b88>]
05bad 118      move.w	r0, c
05bb0 24       move.1	4, p
05bb2 809      add.a	p+1, c
05bb5 20       move.1	0, p
05bb7 8f8da60  call.a	#6ad8		; blkalloc?
05bbe 132      swap.a	a, d0
05bc1 130      move.a	a, d0
05bc4 120      swap.w	a, r0
05bc7 34c2a20  move.p5	type_String, c	; [<#2a2c>]
05bce 144      move.a	c, @d0
05bd1 164      add.a	5, d0
05bd4 140      move.a	a, @d0
05bd7 164      add.a	5, d0
05bda 1f97507  move.5	TOS, d1		; [<#70579>]
05be1 147      move.a	@d1, c
05be4 135      move.a	c, d1
05be7 03       retclrc