Absolutely perfect!

Eye halve a spelling chequer
It came with my pea sea.
It plainly marquees four my revue
Miss steaks eye in knot sea.

Eye strike a key and type a word
And weight four it two say
Weather eye am wrong oar write
It shows me strait a weigh.

As soon as a mist ache is maid
It nose bee fore two long
And eye can put the error rite
Its rare lea ever wrong.

Eve have run this poem threw it
I am shore your pleased two no
Its letter perfect all the weigh
My chequer tolled me sew.

Anon.