NEW-N (n being an address to set a new ramtop value)
PRINT TO-de(used to set number output to E-notation)
Having read this I wondered is it possible that these early replacement ZX80 upgrade ROMS (as opposed to proper ZX81 ROMS) actually contained these commands or was it just a piece of the usual Sinclair sales blurb that the books author fell for?
If so it seems a shame that a half dozen or so useful commands had to give way to the routines used to power the dreadful piece of junk that was the Sinclair printer. I think a ROM with those original features would be very interesting to play with,now there's a challenge for the gurus!
The story I heard was when the printer was developed those commands had to be removed since the ZX81 pretty much has to do all of the printer control.
This is a shame, as those commands would have been really nice to have.
Not to second guess good 'ol Clive, but I also wish the ZX81 had 4K of RAM and not have to deal with a collapsed display file. I think that would have freed up more code space to at least have the DRAW command.
READ and RESTORE for example was on the Q/W keys. Just scroll through the ZX80 stuff to find relevant picture.