letzter Beitrag von Diddl am
This is a thing I wanted to try, so now I have replaced the FE3 firmware in the flash chip with my own code, which will not boot. 
But now I can't put the fe3 firmware back on, because my VIC wont' boot because it get's stuck in my code... Yes I painted myself into a corner.
Is there an easy way to get out of this mess without some hardware hacking? (Help!)
BTW: R019 is (was, will be) very fast. Thanks!
If you remove the jumper from JP12, your VIC-20 should start without activating the autostart code.
I don't know if it is possible to write the flash without that jumper. If it is not, you need to put the jumper back in place after switching on.
Hope that helps
Oliver
Yes, that did the trick! You have to put the jumper back on in order to write the flash chip. JP12 maybe a little bit hard to reach, it's easier to put the FE3 is in a port expander.
Thanks!
You can also develop your code on VICE emulator since it emulates FE3 also now.
