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prsser.mac
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Title PRSSER - Paper Tape Reader Service Routine for KS10s - V003
Subttl Timothe Litt 10-SEP-85
;From PTRSER V 043
SEARCH F,S
$RELOC
;THIS SOFTWARE IS FURNISHED UNDER A LICENSE AND MAY ONLY BE USED
; OR COPIED IN ACCORDANCE WITH THE TERMS OF SUCH LICENSE.
;
.CPYRT<1973,1986>
;COPYRIGHT (C) 1973,1974,1975,1976,1977,1978,1979,1980,1982,1986 BY
;DIGITAL EQUIPMENT CORP., MAYNARD, MASS.
;ALL RIGHTS RESERVED.
XP VPTRSR,003
;PUT VERSION NUMBER IN GLOB LISTING AND LOADER STORAGE MAP
ENTRY PTRSER
PTRSER::
; CSR and DDB bit definitions
PRS==PTRDTI##+0 ;Word in DDB with IO address of CSR
ERR==100000 ;Error (No tape, offline, no power)
BSY==004000 ;Busy (Set by GO, cleared by DONE)
DONE==00200 ;Done (Set when char is avail, clr by ref to DB)
INTENB==100 ;Enable interrupt on error or done
GO==000001 ;Read a frame
PRB==PTRDTI##+1 ;Word in DDB with IO address of data buffer
PTRIVA==PTRDTI##+2 ;Word in DDB with interrupt vector
PTRIVI==PTRDTI##+3 ;Word in DDB with interrupt instruction
PTRCNT==PTRBLK##+0 ;Word in DDB which counts frames of a binary wd
PTRWRD==PTRBLK##+1 ;Word in DDB which holds binary word during assy
; SPECIAL IO STATUS WORD ASSIGNMENTS
PTRBIM==200000 ;PTR is in BINARY mode
; SPECIAL ASCII CHARACTERS
RUBOUT==177
Subttl UUOCON Interface -- Dispatch table
;PTR SERVICE DISPATCH TABLE
JRST PTRONL ;See if on-line
JRST ECOD2## ;SPECIAL ERROR STATUS
JRST REGSIZ## ;BUFFER LEN CAN BE GOTTEN FROM DDB
JRST PTRINI ;INITILIZE
JRST PTRREL ;HUNG DEVICE TIME-OUT ERROR.
PTRDSP::JRST PTRREL ;RELEASE
JRST ILLOUT## ;CLOSE CALLED ONLY ON ILLEGAL OUTPUT
JRST ILLOUT## ;OUTPUT
JRST PTRIN ;INPUT
Subttl UUOCON Interface -- Initialize, RELEASe
PTRINI: MOVE T1,PRS(F) ;Get CSR address
PUSHJ P,UBGOOD## ;See if alive
JRST CPOPJ1## ;No, hopeless case
HRRZ T1,PTRIVA(F) ;Get interrupt vector address
LSH T1,-2 ;Change bytes to words
HLRZ T2,PRS(F) ;Get UBA number
ADD T1,.EPVIT##-1(T2) ;Compute address of vector table entry
MOVE T2,PTRIVI(F) ;Get vector instruction
MOVEM T2,(T1) ;Save for interrupts
PUSHJ P,PTRREL ;Do the RELEAS code
JRST CPOPJ1## ;And return to SYSINI
PTRREL: MOVE T1,PRS(F) ;Get CSR address
PUSHJ P,UBGOOD## ;Make sure this device is alive
POPJ P, ;It's not, don't die
MOVEI T1,INTENB ;Get interrupt enable bit
BCIO T1,@PRS(F) ;Clear it to stop the device
POPJ P, ;Done
Subttl UUOCON Interface -- IN
PTRIN: TLNN S,IOBEG ;INPUT. VIRGIN DEVICE?
JRST PTRIN1 ;NO
TLO S,IOFST ;NEXT ITEM WILL BE FIRST ITEM OF A BUFFER
PUSHJ P,SETBYT## ;T1 0-5:=T1 12-13:=0,T1 6-11:=BYTE SIZE
MOVEM T1,DEVPTR(F) ;DEVPTR:=C(T1)
MOVE T1,PRS(F) ;Get CSR address
PUSHJ P,UBGOOD## ;Be sure device exists
JRST PTRINA ;It does not, bitch
MOVEI T1,ERR ;Get the error (out of tape) bit
TION T1,@PRS(F) ;Error?
JRST PTRIN1 ;No, ok to begin
PTRINA: PUSHJ P,HNGSTP## ;Error - INFORM USER
JRST PTRIN ;Try again when/if restarted
PTRIN1: TLZ S,IOBEG ;Device is starting
MOVEI U,INTENB+GO ;Start tape moving - read first frame of buffer
LDB T2,PIOMOD##
CAIE T2,IB ;IMAGE BINARY?
CAIN T2,B ;OR BINARY?
TLOA S,PTRBIM ;Yes, run in binary mode
TLZA S,PTRBIM ;No, run in normal mode
PUSHJ P,BIMRST ;Reset binary mode pointers
CONO PI,PI.OFF ;BETTER NOT INTERRUPT
TRO S,IOACT ;TELL PI-LEVEL THE PTR IS GOING
MOVEM S,DEVIOS(F)
BSIO U,@PRS(F) ;Start the reader
CONO PI,PI.ON ;TURN ON PI'S
PJRST SETHNG## ;SET HUNG TIME AND RETURN
BIMRST: MOVEI T2,6 ;Frames/word
MOVEM T2,PTRCNT(F) ;Save as frames to go
SETZM PTRWRD(F) ;Start with a clear word
POPJ P, ;All set
PTRONL: MOVE T1,PRS(F) ;Get CSR address
PUSHJ P,UBGOOD## ;Alive?
POPJ P, ;No, off-line
MOVEI T2,ERR ;Yes, error?
TION T2,(T1) ;...
AOS (P) ;No error, on-line
POPJ P, ;Error
Subttl Reader Interrupt Service
PTRINT::
RDIO T1,@PRS(F) ;Read status register
MOVEM T1,DEVSTS(F) ;Save for watchers
PUSHJ P,IOSET## ;Get S and J
TRNE T1,ERR ;Error (no tape)?
JRST PTREND ;Yes, stop
RDIO U,@PRB(F) ;Get this frame
TLNN S,PTRBIM ;Binary mode?
JRST PTRIN0 ;No, all set
TRNE U,200 ;Binary frame?
JRST PRINTA ;Yes, process it
PRINTB: MOVEI T1,GO ;No, just read the next
BSIO T1,@PRS(F) ;Start the reader
JRST DPOPJ## ;Store S and return
PRINTA: MOVE T2,PTRWRD(F) ;Get word so far
LSH T2,6 ;Shift over 6 bits
ANDCMI U,77 ;Only 6 bits/frame
IORB T2,U ;Add in the new frame
SOSG PTRCNT(F) ;Done with word?
JRST PRINTC ;Yes, Reset counter and provide word
MOVEM T2,PTRWRD(F) ;No, store result so far
JRST PRINTB ;And get next frame
PRINTC: PUSHJ P,BIMRST ;Word done, reset count
PTRIN0: TRNE S,B ;MODE=BINARY?
JRST PTRI0 ;YES
ANDI U,177 ;MASK OUT PARITY BIT
CAIN U,RUBOUT ;LAST CHAR A RUBOUT?
JRST PRINTB ;Yes, Store S, start read of next frame,
;and dismiss
JUMPE U,PRINTB ;Null frame, trash it
PTRI0: PUSHJ P,STODAT## ;NO STORE DATA WORD.
JFCL ;CHECKSUM ERROR
JRST PTRI1 ;BLOCK FULL OR BLOCK COMPLETE
JRST PTRRST ;DATA STORED CORRECTLY.
PTRI1: PUSHJ P,ADVBFF## ;ADVANCE BUFFER
JRST PTRNBF ;No new buffer, stop
PTRI2: TLO S,IOFST ;IOFST:=1. NEXT ITEM IS FIRST ITEM OF A BUFFER.
PUSHJ P,SETIOD## ;Restart Job
PUSHJ P,STOIOS## ;Ensure hung count is reset
MOVEM J,DEVCTR(F) ;Save J
JRST PRINTB ;Yes, do so
PTRNBF: TRZ S,IOACT ;Clear IOACT
PUSHJ P,PTRREL ;Shut down
JRST STOIOS## ;Store S, and exit
;COME HERE WHEN THE READER IS SHUT OFF
PTREND: TRZN S,IOACT ;SHUTTING DOWN PTR?
JRST PTREI1 ;YES, JUST GO AWAY
LDB T1,PIOMOD##
TLO S,IOEND+IOBEG
CAIE T1,B ;CHECKSUM BINARY BLOCK MODE?
JRST PTREI ;NO.
TLNN S,IOFST ;IOFST=1?
TRO S,IOIMPM ;NO. BINARY BLOCK INCOMPLETE.
JRST PTREI1
PTREI: PUSHJ P,STOSQD## ;FINISH THIS BUFFER, STORE WORD COUNT
JFCL
PUSHJ P,ADVBFF## ;ADVANCE BUFFER
JFCL
PTREI1: PUSHJ P,PTRREL ;CLEAR PTR AND CONSO FLAG
PUSHJ P,RTEVMI## ;RETURN ANY EVM WE MAY OWN
TLO S,IOFST ;Set for new buffer
PUSHJ P,SETIOD## ;Restart job
MOVEM J,DEVCTR(F) ;
PJRST STOIOS##
PTRRST: MOVEM J,DEVCTR(F) ;DEVCTR:=C(J)
PUSHJ P,STOIOS## ;STORE S,RESET HUNG DEVICE
JRST PRINTB ;TIMEOUT COUNT AND DISMISS.
END