 These routines could save (HISAVE), load (HILOAD) and verify (HIVERIFY) in "Hi-Speed" (4200 bps); save and load, BASIC variables in 300 bps (standard ZX81 speed) using DSAVE and DLOAD functions and 4200 bps (Hi-Speed) using DHSAVE and DHLOAD.These routines were all accessible using RAND USR commands.The save to variable function could be used to make copies of programs on tape.