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Interface to Selected Extended Mode Executive Requests
F.2.3. EM$TREADPKT
The EM$TREADPKT PROC generates the packet for the EM$TREAD and EM$ATREAD
PROCs.
Calling Sequence
label EM$TREADPKT outbuf,len,linespa,inbuf
or
label EM$ATREADPKT outbuf,len,linespa,inbuf
Parameters
outbuf
len
linespa
inbuf
The address (18-bit offset from zero) of the buffer containing the image to be
printed.
The word length of the image to be printed.
The line spacing for the image to be printed (if omitted, the default is one).
The address (18-bit offset from zero) of the buffer to read the input image into.
The outbuf, len, linespa, and inbuf parameters may also be set at execution time.
The outbuf parameter is located at word 3 of the packet (packet address + 2). The len
parameter is located at S3 of word 2 of the packet, and the linespa parameter is located
at T1 of word 2. The inbuf parameter is located at word 4 of the packet.
The buffers must be in either the same bank that contains the packet or in a bank that is
based on B15 when EM$TREAD or EM$ATREAD are called.
The status word from ER TREAD$/ATREAD$ is returned in word 5 (packet address + 4)
of the packet. S2 of word 5 contains an EOF flag; a non-zero value indicates an end-offile
condition. S1 of word 5 contains the bit settings returned from the ER
READ$/AREAD$ request (bits 35 to 30). H2 of word 5 contains the number of words
read by EM$READ/EM$AREAD into the input buffer. The input buffer is not space filled
if the length of the image read is shorter that the length of the input buffer.
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