Difference between revisions of "GeneveOS Device Operation"
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(Created page with "Accessing devices (floppy disk, hard disk, serial connector, printer) is possible in GeneveOS via XOP calls.") |
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Accessing devices (floppy disk, hard disk, serial connector, printer) is possible in GeneveOS via XOP calls. | 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 | |||
FILE DATA 8 | |||
... | |||
LI R0,PABADD | |||
XOP @FILE,0 | |||
MOVB @PABADD+2,R0 | |||
JNE SF7 | |||
... | |||
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. | |||
=== Available memory pages === | |||
'''Opcode: 0''' | |||
{| class="xoparg" | |||
|- | |||
| | |||
! Input !! Output | |||
|- | |||
| R0 | |||
| Opcode (0000) || Error code (always 0) | |||
|- | |||
| R1 | |||
| || Number of free pages | |||
|- | |||
| R2 | |||
| || Number of fast free pages | |||
|- | |||
| R3 | |||
| || Total number of pages in system | |||
|- | |||
|} | |||
This function is used to query the free space in the system. No changes are applied. The total number of pages are the maximum number of allocatable pages. | |||
Revision as of 16:04, 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
FILE DATA 8
...
LI R0,PABADD
XOP @FILE,0
MOVB @PABADD+2,R0
JNE SF7
...
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.
Available memory pages
Opcode: 0
| Input | Output | |
|---|---|---|
| R0 | Opcode (0000) | Error code (always 0) |
| R1 | Number of free pages | |
| R2 | Number of fast free pages | |
| R3 | Total number of pages in system |
This function is used to query the free space in the system. No changes are applied. The total number of pages are the maximum number of allocatable pages.