/*
 * I/O packet
 *
 * INCLUDE CX.H PRIOR TO INCLUDING THIS FILE
 *
 * Be sure to clear i_prm[7] before calling $iofin or you'll
 * get strange bird droppings left around.  Thanks to Ralph
 * Stamerjohn for warning me about this so I didn't suffer.
 */
struct iopkt   {
               struct iopkt *i_lnk;    /* Link to next packet */
               byte        i_pri;      /* Priority (byte) */
               byte        i_efn;      /* Event flag number (byte) */
               struct tcb *i_tcb;      /* TCB address of requestor */
               word       *i_ln2;      /* Address of 2nd LUT word */
               struct ucb *i_ucb;      /* Address of redirect UCB */
               word        i_fcn;      /* I/O function & subfunction */
               word        i_iosb[3];  /* IOSB address parameters */
               address     i_ast;      /* Virtual address of AST routine */
               word        i_prm[8];   /* Device parameters */
               };