BASIC IO functions
SAVE
SYS57809(N$),<device>:POKE193,<start_lo>:POKE194,<start_hi> POKE780,193:POKE781,<end_lo>:POKE782,<end_hi>:SYS65496
SYS57809(N$),<device>,1:POKE193,<start_lo>:POKE194,<start_hi> POKE780,193:POKE781,<end_lo>:POKE782,<end_hi>:SYS65496
LOAD
SYS57809(N$),<device>:POKE780,0:POKE781,<start_lo>:POKE782,<start_hi>:SYS65493
SYS57809(N$),<device>,1:POKE780,0:SYS65493
OPEN
CLOSE
PRINT is the most versatile instruction in CBM BASIC. It provides the display of constant strings, numbers, numeric expressions, and string expressions; added to this are simple means to format the output.
A constant string is written in quotes, and displayed thus:
PRINT "HELLO VIC!" HELLO VIC! READY.
A number isn't embedded in quotes:
PRINT 1 1
When printing numbers, a space is printed to the left of the number, when that number is positive. With a negative number, the minus sign is printed instead of the space.
PRINT -2 -2
The PRINT statement allows for a quick calculation of numeric expressions on the READY prompt:
PRINT 2+3*5 17
Finally, string expressions are also allowed:
10 N$="-20" 20 PRINT "VIC"+N$ RUN VIC-20
All these formats can be combined within one PRINT statement, as long as the maximum line length (88 characters) isn't exceeded. Normally, a PRINT statement adds an implicit carriage return (CR) at the line, moving the cursor to the beginning of the next line. A semicolon at the end of the argument suppresses that CR. The semicolon also is often used, though not mandantory, to concatenate the output of two arguments.
A comma between two arguments aligns to the next tabulator. This is either the middle of the current line, or the begin of the next line.
PRINT#
PRINT# works like PRINT, expect its first argument refers to a logical file number from an OPEN statement.
It is used to write data to files to tape, or floppy disc; or to send commands to the floppy drive.
