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excerpt: "In writing programs in Machine Code it is sometimes necessary to bring in data from a BASIC program or from direct input. A simple way is to go to M/C with RANDOMIZE X+USR 65000. That puts X on the calculator stack, from which it may be drawn and used within the M/C program. X may…"
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---

# Stacking the Calculator

In writing programs in Machine Code it is sometimes necessary to bring in data from a BASIC program or from direct input.

A simple way is to go to M/C with `RANDOMIZE X+USR 65000`. That puts X on the calculator stack, from which it may be drawn and used within the M/C program. X may be a variable or numerals.

That approach may be expanded to stack several numbers. Just include `"X+(...)"` for each added number. For example:

```
RANDOMIZE X3+(X2+(X1+USR 65000))
```

will put three numbers on the stack, with X1 “on top”.

At the end of the M/C program add a line:`"EF A0....38"`, with one A0 for each + sign in the entry. The A0’s put 0’s on the stack to replace the numbers originally stacked and then used in the M/C program.