diff options
Diffstat (limited to 'share/man/man4/man4.i386/asc.4')
| -rw-r--r-- | share/man/man4/man4.i386/asc.4 | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/share/man/man4/man4.i386/asc.4 b/share/man/man4/man4.i386/asc.4 index ad24fa1..18bfd37 100644 --- a/share/man/man4/man4.i386/asc.4 +++ b/share/man/man4/man4.i386/asc.4 @@ -48,7 +48,8 @@ It uses DMA and interrupts. Up to 50 lines of scanned input data are buffered in the driver. .Pp The device can operate at four different resolutions: 100, 200, 300 -and 400 dots per inch. It produces a simple bitmap with the most +and 400 dots per inch. +It produces a simple bitmap with the most significant bit at the left side. The driver can optionally output the simple portable bitmap file format .Xr pbm 5 ; @@ -100,7 +101,8 @@ Get the current height of the bitmap. .It Dv ASC_SBLEN .Pq Li int Set the length of the buffer used internally to do the DMA transfer. -The buffer length is supplied in lines of the bitmap. Since the buffer +The buffer length is supplied in lines of the bitmap. +Since the buffer size limit is (currently) 0x3000 bytes, the maximum number of lines allowed will vary with the width of each line. An .Er ENOMEM @@ -110,7 +112,8 @@ error is returned if the requested length would exceed this limit. Get the current buffer length in lines. .It Dv ASC_SBTIME .Pq Li int -Set the timeout for the completion of reading one buffer. Since a +Set the timeout for the completion of reading one buffer. +Since a handy scanner is a human/computer interface timeout values are usually higher than those of a flat scanner; the default is 15 seconds. After timeout is reached the read operation will fail with |
