I did not bother with decoupling caps as they increase the part count and price, and the breadboard and v1 designs appeared to function fine without them.
"Appeared to function fine" is not quite the same as "functions fine." :) Omitting the decoupling capacitors is a false economy, in my opinion ...

I was working on transferring my breadboard design to perfboard and got really annoyed at trying to cut and place all the many address and data lines - it was a huge hassle. So since I have given up on that route I have started looking at PCB options as all the wiring can be done by the factory ...

Thanks BigEd, I am used to some other forums where the attachments do not work well and people suggest you upload it to a different site.

Martin, I was able to write binary files including some compiled asm I have made. The python script was using print() as a function and ran fine in 3.0, it had ...

It works! http://i.imgur.com/yMRQKTD.jpg (I tried embedding the image but it was way too large)

Both the java programs (mkller/rpress) would not compile due to various gui items not existing. Googling wasn't much help. I tried the python program but it had issues saying the ack wasn't received ...

The ZIF socket you linked to is a 28 pins, but too narrow for EEPROMs which use a socket twice as wide.
Thanks, I actually found another one that is .6" instead of .3", so I guess that will work. If anyone is interested here it is - https://www.sparkfun.com/products/9176. It is still much cheaper ...

Thanks Martin. I would agree that a one off pcb is wasteful especially with many companies having a 5/10 board MOQ.

I remember looking at http://www.ichbinzustaendig.de/dev/meeprommer-en but thought that most of the information their was outdated. Regardless the 74HC595 shift registers mentioned in ...

Hi guys,

I just registered to the forum for this project. I am planning on making a z80 computer and was looking at possible eeproms. One of which was the AT28C256. In my quest to find a cheap flasher I managed to stumble upon this wonderful thread. Unfortunately UnaClocker's tindie page has been ...