| Dec. | Hex. | Mnemonic | System calls: ZX BASIC |
| 07BD | DECODE | Finds kbd character code. ROM | |
| 0A2A | CLS | Clear screen | |
| 0B6B | PRINT STR$ | Prints mnemonic string | |
| 0C0E | SCROLL | ||
| 0EC5 | TEST-ROOM | ||
| 0ED3 | REPORT-4 | ||
| 0ED8 | RETURN | ||
| 0EE5 | REPORT-7 | ||
| 0EE9 | INPUT | ||
| 0F05 | PROMPT | ||
| 0F14 | ENTER-CUR | ||
| 0F21 | REPORT-8 | ||
| 0F23 | FAST | ||
| 0F2B | SLOW | ||
| 0F32 | PAUSE | ||
| 0F46 | BREAK-1 | ||
| 0F4B | D-BOUNCE | ||
| Forward References | |||
| 0F55 | SCANNING | ||
| 111C | LOOK-VARS | ||
| 11A7 | STK-VAR | ||
| 1321 | LET | ||
| 13F8 | STK-FETCH | ||
| 1488 | RESERVE | ||
| 149A | CLEAR | ||
| 14A3 | X-TEMP | ||
| 14A6 | SET-STK-B | ||
| 14AD | CURSOR-IN | ||
| 14BC | SET-MEM | ||
| 1548 | INT-TO-FP | ||
| 158A | FP-TO-BC | ||
| 15CD | FP-TO-A | ||
| 15DB | PRINT-FP | ||
| 199D | CALCULATE |
| Dec. addr |
Hex. addr. |
Hex value |
Mnemonic |
| 1C2F | 00 | jump-true | |
| 1A72 | 01 | exchange | |
| 19E3 | 02 | delete | |
| 164C | 03 | subtract | |
| 1755 | 0F | addition | |
| 1ACE | 32 | less-0 | |
| 1ADB | 33 | greater-0 | |
| 002B | 34 | end-calc | |
| 1A51 | A0 | stk-zero | |
| 1A51 | A1 | stk-one | |
| 1A63 | C0 | stk-mem-0 | |
| 1A63 | C1 | stk-mem-1 | |
| 1A63 | C2 | stk-mem-2 | |
| 1A45 | E0 | get--mem-0 | |
| 1A45 | E1 | get--mem-1 | |
| 1A45 | E2 | get--mem-2 |