====== Using runtime zeropage locations in assembly language ======

The runtime zeropage locations used by the compiler are declared in the assembler include file **zeropage.inc**.

^ Location   ^ Size  ^ Meaning            ^ Usage                                        ^
| sp         | 2     | stack pointer      | access the parameter stack                   |
| tmp1..tmp4 | 1 ea. | temporary value    | can be written to at any time (caller saved) |
| ptr1..ptr4 | 2 ea. | pointer            | can be written to at any time (caller saved) |
| sreg       | 2     | secondary register | can be written to at any time (caller saved) |
| regsave    | 4     | register save area | can be written to at any time (caller saved) |
| regbank    | 6     | register bank      | can be used only after saving (callee saved) |