The SX-Key allows File Register Variables to be "WATCH"ed when debugging.
WATCH Variable{.Bit}, Count, Format
The WATCH directive allows the definition of format for viewing and modifying variables at runtime during debug mode. The variable's name, number of bits or bytes to view, and display format may be specified.
WATCH timer, 1, UDEC WATCH flags.0, 1, UBIN
The table below lists the available format settings for the WATCH directive.
| Format | Operation |
|---|---|
| UDEC | Displays value in unsigned decimal format |
| SDEC | Displays value in signed decimal format |
| UHEX | Displays value in unsigned hexadecimal format |
| SHEX | Displays value in signed hexadecimal format |
| UBIN | Displays value in unsigned binary format |
| SBIN | Displays value in signed binary format |
| FSTR | Displays value in fixed-length string format |
| ZSTR | Displays value in zero-terminated string format |
Consult the SX-Key Development System Manual for additional information about the WATCH directive.
The WATCH directive allows you to view variable in different bases and lengths, but each WATCH becomes a new symbol and the way SASM builds its symbol table doesn't lend itself to allowing multiple definitions of the same symbol. The problem is that SASM use a binary tree for storing the symbol table. While you can store more than one item with the same name, the problem is when you go looking for it. In order to find an item, you have to start at the root node and then search node to node (using the next node pointers) until you find the item. If you find it, you terminate the search. The result is that you get an error if WATCH is used more than once to view the same variable.
If you have more than one item with the same name, it means you always have to search throught the entire tree in case you have more than one item with the same name but a different type. While it would be possible (anything is possible in software) to modify SASM to allow multiple symbol definitions for WATCH directives, itt's not an easy task due to the way SASM was originally architected.
An easy workaround is to define a new symbole for each way that you want to view a variable.
flagbyte DS 1 flagbytehex = flagbyte flagbytedec = flagbyte watch flagbyte,8,ubin watch flagbytehex,8,uhex watch flagbytedec,8,udec
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