HP86 problem

[smp]

(07-04-2019 01:15 PM)Alexkumt Wrote:  ... as a second problem the system displays both the characters from the keyboard, but any command is rejected with "Error 88 SMT Bad"
example "3 + 3" instead of answering 6 gives me the same error
"Error 88: BAD STMT"

When the system powers up, you are in BASIC, so, indeed, you are entering a bad statement. Try: Print 3+3<CR>

You have to enter proper BASIC statements in immediate mode, or enter a line number for each statement if you want to build up a multi-line program.

I know that my 86 sent its display off a little to the left side. I had to find a monitor that would allow me to "Under Scan." That is a control button on some monitors. That is what fixed it for me.

Good luck!