15 May
2010
15 May
'10
8:29 p.m.
Hi,
I querry all the sages out there for your recommendations for a romulator and burner set
of tools.
What I would like to have is a emulator tool like a USB device and a set of socket
adapters (DIP and J lead for network cards);
Some command line tools or open source that would let me pipe the result of a comple and
link within a IDE, like eclipse (OK emacs if I must) for the compile debug test cycle;
Then hardware to actually later blow (flash?) some parts, these would be 28 pin dips for
my old z80 fun, and I would like to explore the boot ROM on a network card, so thats why I
ask for a j lead socket adapter.
Somebody brought up the B&C Microsystems guys a few pages back; I knew those guys. I
think I was their largest customer; we bought hundreds of their programmers to ship with
our product, a z-80 industrial terminal for PLCs. It was a build or buy decision; we went
buy, as they gave them to us for $75 or so in volume. We had a few bugs, like buffer
overrun and incorrect handshake over rs232, but they fixed it pretty quick. Nice guys.
While I'm on the embedded topic, has anyone herd of this trick, their calling a
'glitching environment', wherein the fuse protected ROM of a CPU is made
available, by bouncing the supply pin under DAC control and monitoring the bus?
From what I understand, it puts the processor into an
indeterminate state occasionally, and allows you to access the bus of a protected ROM in
the CPU.
Secure microcontrollers are apparently, not that secure.
I was looking into homebuilt spectrum analyzers (I'm KF7CJW) and ran across this hack
from a kiddies texting IM toy, its a GHz tuner, display and processor for >$20
http://ossmann.blogspot.com/2010/03/16-pocket-spectrum-analyzer.html
Processor glitching is discussed as part of their JTAG reflash of this toy.
Not that I actually had to come clean by revealing processor glitching as an innocent
discovery on another topic; I've been looking for ways to pick locks most of my life.
Randy
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16 May
16 May
9:43 a.m.
I querry all the sages out there for your
recommendations for a romulator and burner set of tools.
I know this isn't what you are looking for, but I thought I'd mention it because
it's
related and some of the guys on the list may find it "interesting".
One of the things I dug up and posted to my "DOS widgets" page in the past
couple of months is
"QDRE" (Quick and Dirty Rom Emulator). This is an ultra-cheap ROM emulator that
can be built
with only 5 chips. I created it years ago as a way for guys to get debug monitors and
other
diagnostics into various systems that I was helping them with remotely.
It consists of a socket with some counters attached to the PC parallel port, and moving a
module containing either a Dallas type NVRAM chip, or a powered RAM on an umbilical cable
(I didn't say it was a "clean" design - just ultra cheap). It does work!
While I'm on the embedded topic, has anyone herd
of this trick, their calling a 'glitching
environment', wherein the fuse protected ROM of a CPU is made available, by bouncing
the supply pin
under DAC control and monitoring the bus?
From what I understand, it puts the processor into an indeterminate state occasionally,
and allows
you to access the bus of a protected ROM in the CPU.
There are microcontrollers with "a security bit" and "secure
microcontrollers" - they are not the
same thing!
I recall guys filling the external address space of "protected" 8051s with NOPs
ending at a routine
to read out the internal memory and hitting the power rails until it glitched and jumped
outside
the internal memory...
Dave
--
dave09 (at) Dave Dunfield
dunfield (dot) Firmware development services & tools: www.dunfield.com
com Classic Computers: http://www.classiccmp.org/dunfield/
5:54 p.m.
On Sat, 15 May 2010, Randy Dawson wrote:
Hi,
I querry all the sages out there for your recommendations for a
romulator and burner set of tools.
What I would like to have is a emulator tool like a USB device and a set
of socket adapters (DIP and J lead for network cards);
Some command line tools or open source that would let me pipe the result
of a comple and link within a IDE, like eclipse (OK emacs if I must) for
the compile debug test cycle;
Parallax used to make an inexpensive little ROM emulator that interfaced
to a parallel printer port. Maybe keep an eye on e-bay or hamfest?
Steve
--
5155
days inactive
5155
days old
2 comments
3 participants
participants (3)
-
dave09＠dunfield.com -
rdawson16＠hotmail.com -
snhirsch＠gmail.com