See all articles from Syntax/Syntax ZX80 v4 n12
Some Spectrum MC tapes will run on your 2068, The Fruit Machine, for example. Your chances are better if the program is written for 48K. Programs that call keyboard scan routines—as IN 64510, 61438, 32766, or 65278—will run if you change these to INKEY$ or STICK commands on your 2068. Also programs written with MC above RAMTOP are more likely to run. Because Spectrum program memory starts lower than in the 2068, the tape tries to load where the 2068 cannot accept it.