Ok, thank you. The circuit is working, except not as it is supposed to function but that has to do with programming and the program counter or maybe some wires are off by me (although I checked them twice). I give it to sunday to try to make it correct but that is seperate from the issue I have with the start/stop on my computer. It is not so easy on a small screen to go step by step through the program zooming in and out, scrolling through the field and even using magnifying glasses. The original is here: http://www.galacticelectronics.com/Simple4BitCPU.HTML
and contains two sample programs at the bottom of the page. Now I can try the new Rom-editor function. I downloaded version 4.15, took about 3 minutes up and running and it looks great and bettter still, you are right, the start/stop issue is gone!!
Comparing 14&15 with same program and same Ram/Rom memory-datas and they behave differently. I am not sure if you want to go into this but the Ram/Rom-files can be found here:https://github.com/Alectus/Gep-Cpu
with my latest Gep-simu-version with title Part Two 14Test1.
The difference in 4.15 seems to be at this 374 register:
CP (LTCH INS) is pulsing but nothing comes out at the Q's but in 4.14 it does.
When I downloaded 4.15 it said 'package xx already excists, do you want to replace it?' I clicked yes. Don't remember the number of the package and it was only one. Don't know how a package already can excist when a program is downloaded for the first time.
Let me test the 374 separately in 4.15, I will let you know.
374 seperately, as stand-alone, works fine.
In circuit it is not responding although inputs and clock are pulsing and /OE is Low. I even changed the 374 with one from the 4.15 components list.
By the way, this is not about my project, I am fine with that, just want to let you know what I notice
Weird, left under is a copy from left above and functions as expected
Removed tunnels and output comes on
Maybe it is not such a good idea to interchange programs made in 4.14 into 4.15. Of course I could draw this whole scheme a new in 4.15 but that takes a little bit more time.