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Location 770 is the low byte of the address of the main BASIC program loop. Changing that causes BASIC to go there instead of the normal $a483 (the $83 low byte is the default 131 decimal). Setting it to 120 makes it go to $a478 which calls a string printing routine (with garbage input since it...

Would you recommend a slow or fast blow fuse in this application?

A fuse sounds like a great idea. I have a current limit set on the supply of 1.2A because that's the spec for the KIM-1. I'll probably lower that to 1A but I still have to trust that the electronics in the supply won't fail somehow. I have a voltage limit set to 5.1V in the supply as well. There...

It's working! Everything I tried so far looks good including stop and single step (after remembering to set the vectors). It's drawing about 0.7A. More testing needed!

Good to know, thanks. I'll be super careful powering it up.

Thanks for all the replies. I measured the cap in circuit so I'm not absolutely sure. Both electrolytics, C1 and C4 have a little bit of corrosion on the negative side. I don't think there are any tants. I don't believe C18 is and the rest are large and yellow (polyester?) My 5V power supply is...

I recently received a Rev. F KIM-1 that appears to be in excellent condition. Any suggestions as to any precautions to take before powering it up? One of the electrolytic capacitors, C1 shows a resistance of a few hundred ohms which doesn't seem great. I have a current limited supply. Any danger...