diff options
Diffstat (limited to 'share/man/man4/ppbus.4')
| -rw-r--r-- | share/man/man4/ppbus.4 | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/share/man/man4/ppbus.4 b/share/man/man4/ppbus.4 index 4626a10..2481205 100644 --- a/share/man/man4/ppbus.4 +++ b/share/man/man4/ppbus.4 @@ -196,7 +196,8 @@ accessing the extended control register. .Sh IEEE1284-1994 Standard .Ss Background This standard is also named "IEEE Standard Signaling Method for a -Bidirectional Parallel Peripheral Interface for Personal Computers". It +Bidirectional Parallel Peripheral Interface for Personal Computers". +It defines a signaling method for asynchronous, fully interlocked, bidirectional parallel communications between hosts and printers or other peripherals. It @@ -319,7 +320,8 @@ functions. But, in order to attach a handler, drivers must own the bus. Consequently, a ppbus request is mandatory in order to call the above -functions (see existing drivers for more info). Note that the interrupt handler +functions (see existing drivers for more info). +Note that the interrupt handler is automatically released when the ppbus is released. .Ss Microsequences .Em Microsequences |
