Hi Ivo, Glad you like EasyEDA! At present EasyEDA is limited to 50 simulations per day. This is to try to reduce the risk of the server being blocked by a malicious script running non-stop simulations. There is a little more information in this thread: [Subscription available for a sooner simulation reset?] To discuss increasing your daily simulation limit, please contact [EasyEDA support]. :) [Subscription available for a sooner simulation reset?]: https://easyeda.com/bbs_view_1449.htm [EasyEDA support]: https://easyeda.com/cms_files_about-us.htm#ContactUs

Please see this thread: :)

Hi... I've run into the maximum simulations limit... and I fully understand that this is because I am running a lot of simulations. I'm very new to electronic design, it's just a hobby, so simulations are very very helpful for me, and yes I run them a lot. Anyway... can limits be set per user? I promise I'm not hacking anything... Can I have more? (By the way, I think easyeda is fanstastic... I'd be willing to pay for it) John

Circuit: good* no system model for at89c51-, you can create a model by yourself Please help me to solve this

Hi Arunks2333, Welcome to EasyEDA. I am sorry but there is no simulation model for the at89c51. EasyEDA does not support simulation of processor level devices.