::.. I/O Request Codes ..::
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Meaning of Bit 0
I/O Request Codes
OPEN Types
The code at offset 1 (IY+1) of the I/O Request Vector specifies the operation to be performed.
| I/O-Request Vector (IY-Vector) |
|---|
Bit 0 in the request code indicates whether the request is waiting for the completion of the operation, or whether it should be executed in interrupt mode (background).
| Meaning of Bit 0 | |
|---|---|
| Bit 0 | Explanation |
| 0 | RETURN ON COMPLETION The entire I/O operation is completely processed by the driver and thereafter returned to the calling program. |
| 1 | IMMEDIATE RETURN Only the start of the I/O operation is initiated by the driver and thereafter returned to the calling program. The driver continues to operate under interrupt. The calling program must determine itself the completion of the operation by querying the Completion Code. |
| I/O Request Codes | ||
|---|---|---|
| Code (Hex) | Explanation | |
| 00, 01 | INITIALIZE Drivers: NULL, ZDOS, NDOS, CON, DFS, DISK |
|
| 02, 03 | ASSIGN Drivers: NULL, ZDOS, NDOS, CON, DFS |
|
| 04, 05 | OPEN Drivers: NULL, ZDOS, NDOS, CON, DFS |
|
| 06, 07 | CLOSE Drivers: NULL, ZDOS, NDOS, CON, DFS |
|
| 08, 09 | REWIND Drivers: NULL, ZDOS, NDOS, DFS |
|
| 0A, 0B |
|
READ BINARY Drivers: NULL, ZDOS, NDOS, FLOPPY, CON, PCON, DFS, DISK |
| 0C, 0D | READ LINE Drivers: NULL, CON, PCON |
|
| 0E, 0F |
|
WRITE BINARY Drivers: NULL, ZDOS, NDOS, FLOPPY, CON, PCON, DFS, DISK |
| 10, 11 | WRITE LINE Drivers: NULL, CON, PCON |
|
| 12, 13 | WRITE CURRENT Drivers: NULL, ZDOS, NDOS, DFS |
|
| 16, 17 | DELETE Drivers: NULL, ZDOS, NDOS, DFS |
|
| 18, 19 | DELETE REMAINING RECORDS Drivers: NULL, ZDOS, NDOS, DFS |
|
| 1A, 1B | ERASE Drivers: NULL, ZDOS, NDOS, DFS |
|
| 1C, 1D | READ AND DELETE Drivers: NULL, ZDOS, NDOS, DFS |
|
| 1E, 1F | READ CURRENT Drivers: NULL, ZDOS, NDOS, DFS |
|
| 20, 21 | READ PREVIOUS Drivers: NULL, ZDOS, NDOS, DFS |
|
| 22, 23 | READ DIRECT Drivers: NULL, ZDOS, NDOS, DFS |
|
| 24, 25 | SKIP FORWARD Drivers: NULL, ZDOS, NDOS, DFS |
|
| 26, 27 | SKIP BACKWARD Drivers: NULL, ZDOS, NDOS, DFS |
|
| 28, 29 | SKIP TO END Drivers: NULL, ZDOS, NDOS, DFS |
|
| 2A, 2B | RENAME Drivers: NULL, ZDOS, NDOS, DFS |
|
| 2C, 2D | UPDATE Drivers: NULL, ZDOS, NDOS, DFS |
|
| 2E, 2F | SET ATTRIBUTES Drivers: NULL, ZDOS, NDOS, DFS |
|
| 30, 31 | QUERY ATTRIBUTES Drivers: NULL, ZDOS, NDOS, DFS |
|
| 32, 33 | READ HEADER Drivers: DISK |
|
| 34, 35 | WRITE WITHOUT PRECHECK Drivers: DISK |
|
| 40, 41 | READ STATUS Drivers: NULL, CON |
|
| 42, 43 | WRITE STATUS Drivers: NULL, CON |
|
| 44, 45 | DEACTIVATE Drivers: NULL, CON |
|
| 46, 47 | READ ABSOLUTE Drivers: NULL, CON |
|
| 48, 49 | WRITE ABSOLUTE Drivers: NULL, CON |
|
| 50, 51 | FORMAT Drivers: FLOPPY (nur P8000) |
|
| 52, 53 | READ A TRACK Drivers: FLOPPY (nur mein Eigenbau) |
|
| OPEN Types | ||
|---|---|---|
| Code (Hex) | Explanation | |
| 00, 80 | OPEN for INPUT (sequential, random) | |
| 01, 81 | OPEN for OUTPUT (sequential, random) | |
| 02, 82 | OPEN NEW FILE (sequential, random) | |
| 03, 83 | OPEN for APPEND (ssequential, random) | |
| 04, 84 | OPEN for UPDATE (sequential, random) | |