Exactly how we did it too. We created the editor/assembler that peeked to see what was there and display it in Assembly, Hexadecimal, and ASCII.

You could edit whichever version you wanted and it would Poke it into RAM.

You could also save swaths to a file.

Do we have Rimjob_Steve here at Lemmy?

This would be perfect

Back in High School in the 80’s me and a buddy wrote a Z-80 editor assembler in TRS-DOS BASIC.

It was not rocket science.