Before git push there was SAVE "PROG.BAS".
Before AI agents there was a notebook, a pen, and a friend with a computer.
Below — five commands that ran on every machine from ZX Spectrum to QBasic.
Click [ RUN ] on each. Welcome back to 1985.
DEMO 1 · PRINT
10 PRINT "HELLO, WORLD!"
20 PRINT "FROM ", 1985
30 PRINT
40 PRINT "PRESS ANY KEY..."
50 END
> ready
DEMO 2 · FOR / NEXT
10 PRINT "COUNTING TO 5..."
20 FOR I = 1 TO 5
30 PRINT " STEP", I
40 NEXT I
50 PRINT "DONE."
60 END
> ready
DEMO 3 · IF / THEN / ELSE
10 LET X = 7
20 IF X > 5 THEN PRINT "BIG"
30 IF X <= 5 THEN PRINT "SMALL"
40 IF X = 7 THEN PRINT "LUCKY!"
50 END
> ready
DEMO 4 · INPUT (interactive)
10 PRINT "WHAT IS YOUR NAME?"
20 INPUT N$
30 PRINT "HELLO, "; N$
40 PRINT "WELCOME TO BASIC!"
50 END
> ready
DEMO 5 · GUESS THE NUMBER (GOTO + RND)
10 LET T = INT(RND * 100) + 1
20 LET G = 0
30 PRINT "GUESS A NUMBER 1..100"
40 INPUT N
50 LET G = G + 1
60 IF N = T THEN GOTO 100
70 IF N < T THEN PRINT "TOO LOW"
80 IF N > T THEN PRINT "TOO HIGH"
90 GOTO 40
100 PRINT "CORRECT IN", G, "TRIES"
110 END