Econet Technical Details (Rev #2, changes)
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Econet
» Econet Technical Details
Econet Technical Details
Immediate Operations
| Number | Name | Description |
|---|---|---|
| 1 | Read destination machine’s memory | |
| 2 | Write destination machine’s memory (!) | |
| 3 | Calls a subroutine | |
| 4 | Generate Event 8 | |
| 5 | Generate Event 16 | |
| 6 | Halt the destination machine (BBC & Master only) | |
| 7 | BBC & Master only | |
| 8 | Returns a number identifying the machine type | |
| 9 | Returns R0-R15, R13_irq, R14_irq, R13_svc, R14_svc (80 bytes) |
Argument Buffer
| Offset | Meaning |
|---|---|
| 0 | Size of buffer |
Econet JSR, UserProcedureCall and OSProcedureCall Subroutines
| Entry | |
|---|---|
| R1 | Econet procedure call argument buffer |
| R2 | Address of the code entered |
| R3 | Sending station |
| R3 | Sending net |
| Exit | |
|---|---|
| R0 – R4 | May be corrupted |
If the address to call is -1 then the address called is the argument buffer – this allows ARM code to be sent. This is not advised due the inherent security risk of passing data over a possible unsecure network.
Machine Types
| Bits | Value | Meaning |
|---|---|---|
| 0-15 | - | Machine Type: |
| &0000 | Reserved | |
| &0001 | BBC (OS 1 or 2) | |
| &0002 | Atom | |
| &0003 | System 3 or 4 | |
| &0004 | System 5 | |
| &0005 | Master 128 (OS 3) | |
| &0006 | Electron (OS 0) | |
| &0007 | Archimedes (OS 6) | |
| &0008 | Reserved | |
| &0009 | Acorn Communicator | |
| &000A | Master 128 Econet Terminal (OS 4) | |
| &000B | Acorn Filestore | |
| &000C | Master 128 Compact (OS 5) | |
| &000D | Acorn Ecolink card for Personal Computers | |
| &000E | Acorn Unix box | |
| &FFFA | SCSI interface | |
| &FFFB | SJ Research IBM PC Econet interface | |
| &FFFC | Nascom 2 | |
| &FFFD | Reseach Machines 480Z | |
| &FFFE | SJ Research File Server | |
| &FFFF | Z80 CP/M | |
| 16-23 | - | Software version number (BCD) |
| 24-31 | - | Software release number (BCD) |
Econet Protection Bits
| Bits | Disabled if set |
|---|---|
| 0 | Peek |
| 1 | Poke |
| 2 | Remote JSR (BL) |
| 3 | User procedure call |
| 4 | OS procedure call |
| 5 | Halt |
| 6 | Continue (0 on RISC OS) |
| 7 | Machine peek (0 on RISC OS) |
| 8 | Get registers |
| 9 – 30 | Reserved (must be zero) |
| 31 | Write value to CMOS (in Econet_SetProtection) |
See also
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