--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/CoCoOS9/defs/pipedefs	Sat Jul 14 15:16:13 2018 +0900
@@ -0,0 +1,76 @@
+         nam   PipeDefs
+         ttl   OS-9 Pipe Definitions
+
+*   OS-9 Pipe Definitions
+*
+*   IOMan equates duplicated for PipeMan use
+*
+
+NPATHS   set   16         ;Maximum local paths per task -- must match IOMan
+NameMax  set   29         ;Maximum length of a file name
+
+*
+*   Device Driver Static Storage Layout
+*
+         org   V.User
+V.List   rmb   2          ;Pointer to 1st pipe's pipe buffer
+PManMem  equ   .          ;Device driver memory (drive table equivalent)
+
+*
+*   Pipe Buffer Data Structure
+*
+         org   0
+PP.PD    rmb   2          ;Pointer to shared path descriptor
+PP.Next  rmb   2          ;Pointer to next pipe buffer in system map
+PP.Prev  rmb   2          ;Pointer to previous pipe buffer in system map
+PP.Rsrv  rmb   2          ;Reserved
+PP.Data  equ   .          ;Data buffer begins at this offset
+
+*
+*   Unique Path Descriptor Variables
+*
+         org   PD.FST
+*** PP.Read must have bit 4 clear; PP.Writ must be PP.Read XOR 4
+PD.Read  equ   .
+PD.RPID  rmb   1          ;Process ID of reader waiting on signal
+PD.RCT   rmb   1          ;Number of blocked readers
+PD.RSIG  rmb   1          ;Signal to send reader
+PD.REOR  rmb   1          ;Read EOR character
+PD.Writ  equ   .
+PD.WPID  rmb   1          ;Process ID of writer waiting on signal
+PD.WCT   rmb   1          ;Number of blocked writers
+PD.WSIG  rmb   1          ;Signal to send writer
+PD.WEOR  rmb   1          ;Write EOR character (dummy)
+*** End of special section
+PD.End   rmb   2          ;Pointer to end of pipe buffer
+PD.NxtI  rmb   2          ;Next in pointer
+PD.NxtO  rmb   2          ;Next out pointer
+PD.RFlg  rmb   1          ;"Ready" flag
+PD.Wrtn  rmb   1          ;"Written" flag
+PD.BCnt  rmb   2          ;# queue elements currently bufered
+PD.Own   rmb   1          ;Process ID of pipe original creator
+PD.Keep  rmb   1          ;Non-zero if pipe has been kept open artificailly
+PD.QSiz  rmb   2          ;Max. elements in queue (copied from OPT section)
+
+*
+*   Path descriptor option section
+*
+*   Note that PD.Name overlaps with the last byte of PD.ECnt.
+*   PD.ECnt is copied to PD.QSiz as part of OPEN or CREATE,
+*   to make room for the pipe name.
+*
+         org   (PD.OPT+1)
+PD.ESiz  rmb   1          ;Size of each queue element
+PD.ECnt  rmb   2          ;Max. elements in queue (initial position)
+
+*
+*   Device Descriptor definitions
+*
+IT.PDC   equ   $12        ;Pipe device class (like IT.DTP, IT.DVC)
+         org   IT.PDC
+         rmb   1          ;Leave room for device class
+IT.ESiz  rmb   1          ;Size of each queue element
+IT.ECnt  rmb   2          ;Max. elements in queue (initial position)
+
+*   End of pipedefs
+