GeneveOS Utility Functions
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Accessing devices (floppy disk, hard disk, serial connector, printer) is possible in GeneveOS via XOP calls.
User-task XOPs
User-task XOPs are available for use in application programs. Here is a typical example:
UTIL DATA 9
PARSE DATA >0008
...
LI R0,PARSE opcode
LI R2,PABADD+15 target buffer; here: name field of PAB
LI R3,>5000 first byte is maximum length of buffer
MOVB R3,*R2
CLR R3 normal mode
XOP @UTIL,0
JEQ OK
Similar as with the TI-99/4A device service routine concept (DSR), a Peripheral Access Block (PAB) must be set up prior to invoking the XOP.
Utility functions
Opcode 0: Validate time
Checks whether the clock chip contains a valid time setting.
| Input | Output | |
|---|---|---|
| R0 | 0000 | - |
| Status | - | EQ=1 if time is valid |
Opcode 8: Parse filename
| Input | Output | |
|---|---|---|
| R0 | 0008 | Delimiter |
| R1 | Pointer to logical name | Error code |
| R2 | Pointer to target buffer | - |
| R3 | Alias flag | - |
| Status | - | EQ=1 when successfully parsed |