On 2017/12/05 7:11 AM, bitrex wrote:
On 12/04/2017 07:20 PM, wrote:
On Mon, 4 Dec 2017 12:46:12 -0500, bitrex
wrote:

On 11/30/2017 09:29 PM, wrote:
On Thu, 30 Nov 2017 15:12:01 -0800, John Robertson
wrote:

On 2017/11/30 3:09 PM, wrote:
On Thu, 30 Nov 2017 11:56:10 -0800, John Robertson

wrote:

On 2017/11/30 9:33 AM, wrote:
I have several EPROMs from the 1980s that I would like to copy
so that
I will have backups. I see all sorts of readers/programmers
online and
on eBay but I don't know what to avoid or buy. I have EPROMs that I
can practice with. They are good as far as I know but the info
in them
is for a different machine. So I was thinking I could copy one,
then
program a new one with the copied data, and then compare the two to
make sure all the data was copied correctly. I am assuming that the
software I use to copy and write will also have the ability to
compare
the two devices. I may be wrong. In about a month the machine I am
most worried about will be free for long enough for me to do the
copying process. I do know how to handle the boards properly to
avoid
static and other damage and I do have a nice tool made for removing
and inserting the devices.Â* Any advice or suggestions?
Thanks,
Eric


Hi Eric,

It all depends on the chip. For example - 2716s - most Eprom
programmers
can still read those, however if you have 2532s that is harder to
find a
reader for. 2732s, 2764s, and later almost any inexpensive device
(Wilem
for example) will read those.

If you have 2708s then you will have to buy a legacy Eprom
programmer to
read those unless you are adept at making interface modules - you
have
to provide +12 and -5 for 2708s. Earlier still devices, and PROMs
again
need more specialized reader/programmers.

Most of the 70s games are archived and not too hard to find via
MAME.
Which games are you trying to back up?

Or you can talk to someone like my shop where we can read and
program
devices right back to 1702As so we could read your chips and give
you a
copy of the archive. Not free I'm afraid! Cost depends on the
device read.

John :-#)#
The machine in question is a CNC lathe with a Fanuc control. Neither
Fanuc or Miyano, the lathe manufacturer, have any more EPROMs.
Eric


So, what are the part numbers of the EPROMs? Chances are it is fairly
modern, and indeed you want to archive those!

I'd archive them for you if you want to make me a small injection mold
or two (ducking).

John :-#)#
Greetings John,
I'll get part numbers tomorrow and post them. All the EPROMs in my
Fanuc controlsÂ* are, I think, the same part.
Â*Â*Â*Â* After I read the EPROMs I would also like to look at what is
written in them. In particular some of them have ladders. I spoke with
Miyano, who wrote the ladders for the lathe, and they don't have any
records of what was written. But I'm not sure if I am going to need
special software to make sense of what was written.
Â*Â*Â*Â* I want to do this because the Miyano lathe didn't come with a
rapid
override switch or a spindle override switch. Or even a spindle stop
switch that works when the lathe is running a program. These features
are all options for the control and the machine tool maker decides
which ones to use.
Â*Â*Â*Â* The machine moves very fast in rapid, has a 15 hp spindle, and
crashes are nerve wracking. This machine is the only CNC machine I
have seen that does not have a rapid override. Setups with a new
program always make me nervous.
Thanks,
Eric


If all you want to do is read out the contents of a parallel EPROM and
save it an Arduino-type uP should be good enough to do that with a
little circuit design and code - hook cascaded binary counters to the
address lines, hook data lines to the Arduino, step through each address
one by one and log the data to PC over USB/serial connection.

You could then concatenate the data into a .bin file and use a program
like Binwalk to analyze the firmware and find the code and data
sections. A disassembler like Ida could probably then spit out a basic
disassembly with C-like structure if the code is for a processor it
supports.


https://gbhackers.com/analyzing-embedded-files-and-executable-code-with-frimware-images-binwalk/


https://www.hex-rays.com/products/ida/processors.shtml
I'm sure you could do everything you describe above but in this case I
really need something that is basically plug and play. But thanks
anyway.
Eric


If you change your mind someone already did the hard work of designing
the hardware and writing the code he

http://simonwinder.com/2015/05/how-to-read-old-eproms-with-the-arduino/

All you'd have to do is buy the parts and about 20 minutes of soldering,
then plug in and execute the code.



I suspect he would be nervous about building something like that where
there exists the possibility of destroying an irreplaceable part. At
least a commercial EPROM burner that can read 2532s is very unlikely to
cause issues, a home-made one has that potential for folks that haven't
done it before.

Another possible solution is for the OP to join one of the machinist
forums and see if anyone else has a similar CNC lathe and has already
backed up the EPROMs.

John :-#)#

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