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(SYSLIB) Programming Reference Manual - Public Support Login ...

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Interface to Selected Extended Mode Executive Requests<br />

Calling Sequence<br />

EM$xxxxx pkt,b-reg<br />

Parameters<br />

xxxxx<br />

pkt<br />

b-reg<br />

The ER mnemonic to be performed; READ, AREAD, PRINT, APRINT, TREAD,<br />

ATREAD, or SNAP.<br />

The label (18-bit offset from zero) of the packet generated by the appropriate<br />

EM$xxxxPKT PROC.<br />

The B-register of the bank containing the packet generated by the appropriate<br />

EM$xxxxPKT PROC.<br />

Each EM$xxxxx PROC call switches to a basic mode bank, performs the ER, and<br />

switches back to the extended mode bank.<br />

F.2. Packet Generation<br />

The PROCs in the following subsections generate the required packets for the Extended<br />

Mode interfaces to ERs.<br />

F.2.1. EM$READPKT<br />

The EM$READPKT PROC generates the packet for the EM$READ and EM$AREAD<br />

PROCs.<br />

Calling Sequence<br />

label EM$READPKT buffer<br />

or<br />

label EM$AREADPKT buffer<br />

Parameters<br />

buffer<br />

The address (18-bit offset from zero) of the buffer into which the image will be read.<br />

The buffer parameter may be set at execution time, and is located at word 2 of the<br />

packet (packet address + 1).<br />

F–2 7833 1733–004

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