Difference between revisions of "GeneveOS Utility Functions"
Jump to navigation
Jump to search
(Created page with "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 app...") |
(No difference)
|
Revision as of 20:10, 17 July 2016
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:
PABADD EQU >F180
UTIL DATA 9
...
LI R0,PABADD
XOP @UTIL,0
MOVB @PABADD+2,R0
JNE ERROR
...
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 | 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 physical name | - |
| R3 | Alias flag | - |
| Status | - | EQ |