ZiLOG Z80 Handbook page 265

RADIO SHACK SOFTWARE
The 4K version of Radio Shack BASIC includes floating-point
arithmetic, numeric, array, and (limited) string manipulation. It
also includes video-graphics commands and cassette save and load
commands. The SET (x,y) 'command turns on graphics point x,y,
RESET (x,y) turns point x,u off, and POINT (x,y) determines the
state of the point. CLS clears the screen. Direct cursor control is
provided with the PRINT AT(x) command.
The 4K version of BASIC will be supplemented by a 12K version.
Other software, such as editors, assemblers, and disc operating sys-
tems are planned. In addition, a wide range of applications software,
such as game programs and business applications packages are cur-
rently available.
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