mcp-openmsx

# DEF USR ## Effect Defines the start address of a machine language routine for later use in MSX-BASIC. Up to 10 different routines can be used. ## Syntax `DEF USR <Number>=<Address>` ## Parameters `<Number>` can range from 0 to 9. When omitted, 0 is assumed. `<Address>` is the start address of the machine language routine. ## Example ```basic 10 DEF USR1=&H156:A=USR1(0) ' To clear keyboard buffer ``` ## Related to `USR()` ## Compatibility MSX-BASIC 1.0 or higher ## Source Retrieved from "https://www.msx.org/wiki/DEF_USR"