HP Advanced Communications Controllers (ACC) manual

		ZCOM C I/F Library Routines
		ZSETQL (3X)
NOTES	1. Queue limit does not affect data messages that are already in a
	queue. If the new limit is below the amount of queued data, no new
	data is accepted until the queued data drops below the limit. Setting
	a queue limit to zero will prevent the queue from accepting new
	messages. The queue is still readable, but new data can’t be added to
	the queue.
	2. Under the current implementation, the terminal unacknowledged
	queue uses a “byte limit”, i.e. the limit for this queue indicates the
	maximum number of bytes allowed on the queue. The other queues
	use a “message limit”, which means the maximum number of
	messages allowed on the queue. However, the limit type may be
	changed by setting the ZCOM_QLIM_MFLAG or
	ZCOM_QLIM_BFLAG bit in the mode parameter.
	3. The system initializes the express transmit queue (mode 2, qnum 3)
	with the maximum limit (0x7FFFFFFF). A low limit may affect
	critical data getting to the interface card and result in terminal
	control problems. Therefore, it is strongly recommended that the
	limit not be changed unless it is absolutely necessary. With some
	protocol options (e.g. X.25), changing this limit is unsupported!
EXAMPLE	#include <zcom/zcomsys.h>
	#include <zcom/zcomcall.h>
	int32	ierr;
	zaddr_type	zaddr;
	uint32	mode;
	uint32	qnum;
	uint32	limit;

if (ierr = zsetql (&zaddr, mode, qnum, limit)) { /* error return code */

}

else {

/* good return code */

}

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