Years ago when first learning C, I wrote a bit of software to do exactly that, can't remember what it was for now. I've just rebuilt it so it should in theory run on OS1.3, though I don't have an OS1.3 machine handy to test it. Give it a go, it may work for you.
Download the executable and source
here.
It reads/writes 32 bit words at a time. You can increment/decrement through 32 bit words from any given memory location using the + and - keys at the "enter address" prompt.
Be wary, it's probably a piece of crap and has various bugs given my lack of software skills at the time and the haste in which it was written.
