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00930: Empty Queue
Used by the routine at HandleInterrupt.
Reset the buffer pointer to the queue head, discarding anything still queued.
Output
BC Restored buffer pointer
EmptyQueue 00930 LD A,6 Select workspace index 6.
00932 PUSH HL Stash HL on the stack.
00933 CALL ReadWorkspace Call ReadWorkspace for the address of the queue head.
00936 LD B,H Copy the queue-head address to BC.
00937 LD C,L
00938 CALL WriteBufferPointer Call WriteBufferPointer.
00941 POP HL Restore HL from the stack.
00942 RET Return.
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