EXOS 2.1 Serial/Network Driver Specification
5. Quick Reference Summary
- Open/Create Channel
- Treated identically.
- Only one channel, and no network channel.
- Device name
"SERIAL:".
- Filename and unit number ignored.
- No EXOS variables to be set before open.
- Close/Destroy Channel
- Treated identically.
- Read Character/Block
- Reads characters from serial input, some buffering.
- Write Character/Block
- Writes bytes without interpretation.
- Read Status
- Always character ready (C = 0).
- Set Status
- Not supported.
- Special Function
- No special functions
- Open/Create Channel
- Treated identically.
- Multiple channels allowed, but no serial channel.
- Unit number defines destination machine number.
- Filename ignored.
- Device name
"NET:".
- EXOS variable
ADDR_NET must be set before open.
- Close/Destroy Channel
- Treated identically.
- Will try to send any buffered data.
- Read Character/Block
- Reads characters from buffer if available, else returns EOF or
waits.
- Write Character/Block
- Puts bytes in buffer.
- Written to network when @@FLSH special function call is done,
or channel is closed, or buffer is full.
- Read Status
- C =
000h if character in buffer.
- C =
0FFh if end of record.
- C =
001h if buffer empty.
- Set Status
- Not supported.
- Special Function
@@FLUSH = 16 -
Send buffered data with endofrecord flag set.
@@CLR = 17 -
Clear send and receive buffers.
FORM_SET -
Serial format, set to zero by network.
BAUD_SER -
Serial and network baud rate.
ADDR_NET -
Network address of this machine.
CHAN_NET -
Channel on which network block received.
MACH_NET -
Machine from which network block received.
NET_IRQ -
Zero to enable network software interrupts.
- Occurs when a data block is received by a network channel if
NET_IRQ is zero:
?NET = 30h
David Bouman.
(dsbouma@cs.vu.nl)