6502.org

For what it's worth, I've basically given up on using the Arduino IDE here on Linux. It always struck me as being a piece of junk, and then being generally unable to get it to talk with actual hardware reliably, or in some cases at all? Ugh. I very quickly set up avr-gcc, avrdude, a makefile, and minicom for my FlashROM programming project (SST39SF040, from a Mega 2560 R3, all wires and a ZIF socket, no other components), used emacs for editing everything and basically haven't looked back. From MacOS I would probably try the same thing.

I should have been clearer.
I suspect it died between me receiving it and now, due to some horrible wiring accidents that may have occurred

But - I'll continue reducing it down to writing a single byte with the simplest possible program and most conservative timing, and see how it goes.

(VCC is 5.04V at the EEPROM, drops to 5.03V under load e.g. during reads. That seems fine.)

Yeah - I went down that path, although getting a working avr-gcc environment with access to the Arduino libs under Mac OS proved difficult.
Instead I begrudgingly use the Arduino IDE to compile and upload, but do all my editing in vim.

I spent a little time on trying to get the 28Cxxx programmer running on my MacBook Pro (OSX 10., but I was never even able to get Java to see the RXTX library. Looks like I'll have to try again

This is what ended up (sort of) working for me: (I'm using symlinks at the moment, but just copying the files there works too).
The 2.2pre2 lib complains about a version mismatch with 2.2pre1 - that's a known issue and apparently harmless.

Arduino IDE 1.0.x doesn't start with those files present, but Arduino IDE 1.5.x does.
I `mv ~/Library/Java/Extensions ~/Library/Java/Extensions-disabled` if I need to use Arduino 1.0.x.

So yeah - the RXTX situation is all a bit of a mess.

Back from one week in the cold wilderness in Sweden and "surprise, surprise" there's a lot of "action" in this thread again.
Thanks to Paul for the GitHub updates, I merged them into to main project.
I did not updated one of my Macs to 10.9 at this time, so I'm save from the RXTX library problems for now. But as I get a fresh MacBook with my new job starting at January next year, I will do a GitHub checkout and fresh installation on 10.9, documenting all the steps needed to bring the programmer to life.
If somebody has the installation of RXTX, Java and the JavaGUI already done on Linux or Windows, it would be great to get the details to create a install guide for the main operating systems.
It's good to see, that what started as a "proof of concept" is now a little project base for several programmers. Thanks to all contributors.
Mario.

Hi,

I've been working on a 28C64 programmer using the Arduino Uno, based around a simple counter and the MCP23008 I/O extender.

Maybe it's of interest to someone? You can read about it here: http://tobier.se/eeprog/

I've got everything wired on my breadboard, but I haven't finished the firmware and tried everything out yet. Comments and suggestions are very welcome. This is my first real attempt at making a digital circuit design, so there are probably flaws in my design

Thanks tobier, and welcome!

Auduino look fun and all, but really you can get the same results with a breadboard, an ATmega[8/32] and a ISP programmer.

avr-gcc is easy to use if you have done *any* C dev. avr-gcc, avrdude, makefiles and minicom are indeed all you really need.

FWIW, my programmer can be implemented in about 4 components: ATMega8, two 8bit (74HC) counters, and a ZIF socket. Circuit is here: http://aslak3.blogspot.co.uk/2013/03/ee ... rcuit.html Code is on github.

I use mine a couple of times a week. I'll happily post off a PCB and a few spare parts for a few pounds of postage.

rpress, I've got the new boards in hand, should have the components in by the middle of the week. I don't have a 27SF512 so test them out on, so I'm going to send the first assembled board to you to confirm that part of it works. I'll be able to confirm the boards still work. I went to SMT everything this time, aside from the caps/inductors and the diode. It allowed me to keep the board size the same.
As soon as I get the functionality confirmed, I'll post the latest eagle schematic/board files. No point sharing them till I know they work. My name gets completely obscured by the ZIF socket.. haha.. Fair enough, I guess.

hi all. UnaClocker, I bought your last 1.0 board on tindle and it seems not to be working properly.
I read the attached EF.bin file out of a 27c64, and i can write it back to a 28c64 but it seems mangled somehow.
when I write the 8k,.bin file I get ~1000 bytes different using verify, the sections at teh end and beginning are all FF's
I've tried presslab's fork, limiting serial speed, adding delays, etc. Any suggestions? my 6809 sbc is wating for a rom

First, welcome to our 6502 world.
None are jumping out at me at this time. It's probably safe to say that it won't smoke on the first power application. The work will be in programming your firmware. Please keep us posted on your progress.

Nice-looking board. Gotta move your name farther north the next time.

Thanks! I've got everything wired up, and it didn't smoke! However, I either have some problems with my logic or something wired wrong, as I seem to be able to write bytes to the EEPROM but I don't get back what I expect.

Do you have suitable test equipment to monitor the EEPROM pins to see what's going on? Also, are you confident about your timing?