22 Feb
2012
22 Feb
'12
9:02 p.m.
22 Feb
22 Feb
9:19 p.m.
On 22 Feb 2012 at 21:02, Eric Smith wrote:
http://www.brouhaha.com/~eric/retrocomputing/radio_shack/trs80_model_i
i/trs80m2boot.zip
Is this basically the same content as:
http://fjkraan.home.xs4all.nl/comp/trs80m2/m2_cpu_roms.zip
--Chuck
9:24 p.m.
Chuck Guzis wrote:
Is this basically the same content as:
http://fjkraan.home.xs4all.nl/comp/trs80m2/m2_cpu_roms.zip
Depends on what you mean by "the same". It's the same ROMs.
10:20 p.m.
On 22 Feb 2012 at 21:24, Eric Smith wrote:
Chuck Guzis wrote:
What did you use for your disassembler? (I normally use IDA Pro,
which makes very short work of most ROM tasks).
--Chuck
Is this basically the same content as:
http://fjkraan.home.xs4all.nl/comp/trs80m2/m2_cpu_roms.zip
Depends on what you mean by "the same". It's the same ROMs.
10:35 p.m.
Chuck Guzis wrote:
What did you use for your disassembler?
A simple
disassembler I wrote myself.
(I normally use IDA Pro, which makes very short work
of most ROM tasks).
I've used IDA Pro. I agree that IDA Pro makes it simple to
get a
reasonable disassembly, but then, a disassembly isn't at all the same
thing as "reverse-engineered source code" IMNSHO. A disassembly tells
you that 05ah is loaded into the B register, but it usually doesn't tell
you what the meaning of 05ah is, nor why it is desired to have it in B.
Eric
23 Feb
23 Feb
5:57 a.m.
On Feb 23, 2012, at 1:35 AM, Eric Smith wrote:
Chuck Guzis wrote:
Agreed, but I find IDA Pro's interactive features to be invaluable for getting there
(it's my grey matter that turns it back into source code). It has a lot of quirks
that make me want to punch the screen at times, though (especially when dealing with
embedded code where an image may be overlaid one or more times). I'm half inclined to
write my own as well, but I won't have the time for quite a while.
- Dave
(I normally use IDA Pro, which makes very short
work of most ROM tasks).
I've used IDA Pro. I agree that IDA Pro makes it
simple to get a reasonable disassembly, but then, a disassembly isn't at all the same
thing as "reverse-engineered source code" IMNSHO. A disassembly tells you that
05ah is loaded into the B register, but it usually doesn't tell you what the meaning
of 05ah is, nor why it is desired to have it in B. 
6:36 a.m.
> I've used IDA Pro. I agree that IDA Pro makes
it simple to get a reasonabl$
Agreed, but I find IDA Pro's interactive features
to be invaluable for getti$
Please don't use paragraph-length lines.
> I've used IDA Pro. I agree that IDA Pro makes
it simple to get a
> reasonable disassembly, but then, a disassembly isn't at all the
> same thing as "reverse-engineered source code" IMNSHO.
[I find IDA Pro helps, but it annoys me sometimes]
I'm half inclined to write my own as well, but I won't have the time
for quite a while.
I have an interactive disassembler which I wrote specifically for
picking apart unknown binaries. I first started it for dealing with a
captured malware binary; since then I've used it for a Y2K consulting
gig, dealing with a Y2K bug in closed-source software whose vendor no
longer existed (yes, it goes back to before Y2K), and various other
such things. Might be usable as a starting point, if nothing else.
git://git.rodents-montreal.org/Mouse/disas if you'd like to git it;
ftp.rodents-montreal.org:/mouse/disas/src/ if you'd rather FTP.
/~\ The ASCII Mouse
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X Against HTML mouse at rodents-montreal.org
/ \ Email! 7D C8 61 52 5D E7 2D 39 4E F1 31 3E E8 B3 27 4B
10:16 a.m.
On 22 Feb 2012 at 22:35, Eric Smith wrote:
I've used IDA Pro. I agree that IDA Pro makes it
simple to get a
reasonable disassembly, but then, a disassembly isn't at all the same
thing as "reverse-engineered source code" IMNSHO. A disassembly tells
you that 05ah is loaded into the B register, but it usually doesn't
tell you what the meaning of 05ah is, nor why it is desired to have it
in B.
No--but I asked about disassembly, not reverse-engineering. What I
like about IDA is that there are sufficient features to create a
source file that looks like you wrote it yourself--with narrative.
When you're done disassembling you also get a chart that shows how
the various routines interact.
Visual cues are largely in the hands of the guy behind the keyboard.
If you don't know, what, say, a SCSI CDB looks like, no disassembler
is going to help you figure that one out.
It does know about some PC-related I/O ports, interrupts and so
forth, which is useful for disassembling option ROMs. I haven't
looked into seeing if this can be done for other architecutres, such
as the Model II, but I would be mildly surprised if it wasn't
possible.
--Chuck
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