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decus_20tap4_198111
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decus/20-0125/gtload.lst
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GTLOAD GT40 LOAD HANDLER MACDLX 622(622)-1 1-FEB-81 11:36 PAGE 1
GTLOAD.P11
1 .TITLE GTLOAD GT40 LOAD HANDLER
2 000000 CHAR=%0
3 000001 CSUM=%1
4 000002 BYTECT=%2
5 000003 LOADDR=%3
6 000006 SP=%6
7 000007 PC=%7
8 ;
9 175610 GTIS=175610 ; GT40 INPUT STATUS
10 175612 GTIB=175612 ; GT40 INPUT BUFFER
11 175614 GTOS=175614 ; GT40 OUTPUT STATUS
12 175616 GTOB=175616 ; GT40 OUTPUT BUFFER
13 ;
14 ; THIS IS THE GT40 RESIDENT HANDLER DURING
15 ; A LOAD. THIS PROGRAM WOULD BE LOADED
16 ; BY THE GT40 BOOTSTRAP (A SIX BIT LOADER)
17 ; THIS IS AN EIGHT HANDLER SO TRANSFER
18 ; IS SPEEDED UP. THE SECOND ADVANTAGE OF
19 ; THIS HANDLER IS THAT IT RETURNS INFORMATION
20 ; ABOUT EACH BLOCK, ALLOWING THE HOST (I.E. PDP 10)
21 ; BETTER MONITORING OF BLOCK TRANSFERS
22 ;
23 037534 .=37534 ; FOR 8K GT40
24 ;
25 037534 012706 037534 START: MOV #START,SP ; SET UP STACK
26 037540 112700 000122 READY: MOVB #'R,CHAR ; 'R'
27 037544 004767 000206 JSR PC,SEND ; FOR READY
28 037550 005001 GETBLK: CLR CSUM ; CLEAR THE CHECKSUM
29 037552 004767 000156 JSR PC,GET ; GET THE FIRST BYTE
30 037556 005300 DEC CHAR ; IF NOT A 1 THEN
31 037560 001373 BNE GETBLK ; LOOK FOR START
32 037562 004767 000146 JSR PC,GET ; GET THE SECOND BYTE
33 037566 105700 TSTB CHAR ; IF NOT A NULL THEN
34 037570 001367 BNE GETBLK ; LOOK FOR START
35 ;
36 ; START PROCESSING A VALID BLOCK
37 ;
38 037572 004767 000136 JSR PC,GET ; GET LOW ORDER BYTE COUNT
39 037576 010002 MOV CHAR,BYTECT ; AND SAVE
40 037600 004767 000130 JSR PC,GET ; GET HIGH ORDER BYTE COUNT
41 037604 000300 SWAB CHAR ; MAKE HIGH ORDER
42 037606 050002 BIS CHAR,BYTECT ; FORM COMPLETE BYTE COUNT
43 037610 004767 000120 JSR PC,GET ; GET LOW ORDER LOAD ADDRESS
44 037614 010003 MOV CHAR,LOADDR ; AND SAVE
45 037616 004767 000112 JSR PC,GET ; GET HIGH ORDER LOAD ADDRESS
46 037622 000300 SWAB CHAR ; MAKE HIGH ORDER
47 037624 050003 BIS CHAR,LOADDR ; FORM COMPLETE LOAD ADDRESS
48 ;
49 ; IF BYTECT > 6 THEN INTERMEDIATE BLOCK
50 ; IF BYTECT = 6 THEN LAST BLOCK
51 ; IF BYTECT < 6 THEN ERROR
52 ;
53 037626 162702 000006 SUB #6,BYTECT ; UPDATE BYTE COUNT
54 037632 002412 BLT ERROR ; BAD COUNT
GTLOAD GT40 LOAD HANDLER MACDLX 622(622)-1 1-FEB-81 11:36 PAGE 1-1
GTLOAD.P11
55 037634 001416 BEQ LAST ; LAST BLOCK
56 ;
57 ; PROCESS INTERMEDIATE BLOCK
58 ;
59 037636 004767 000072 NORMAL: JSR PC,GET ; GET THE NEXT BYTE
60 037642 110023 MOVB CHAR,(LOADDR)+ ; SAVE THE BYTE, INCREMENT ADDRESS
61 037644 005302 DEC BYTECT ; DECREMENT THE BYTE COUNT
62 037646 003373 BGT NORMAL ; AND LOOP FOR ENTIRE BLOCK
63 037650 004767 000060 JSR PC,GET ; GET THE CHECKSUM
64 037654 105701 TSTB CSUM ; IS CHECKSUM ZERO
65 037656 001730 BEQ READY ; IF SO CONTINUE WITH NEXT BLOCK
66 ;
67 ; CHECKSUM ERROR OR BAD BYTE COUNT
68 ;
69 037660 112700 000105 ERROR: MOVB #'E,CHAR ; 'E'
70 037664 004767 000066 JSR PC,SEND ; FOR ERROR
71 037670 000727 BR GETBLK ; TRY THE BLOCK AGAIN
72 ;
73 037672 004767 000036 LAST: JSR PC,GET ; GET THE CHECKSUM
74 037676 105701 TSTB CSUM ; WAS IT GOOD ?
75 037700 001367 BNE ERROR ; CHECKSUM ERROR
76 ;
77 ; SELF START OR HALT
78 ;
79 037702 032703 000001 BIT #1,LOADDR ; EVEN ADDRESS ?
80 037706 001405 BEQ TRANSF ; YES
81 037710 112700 000110 MOVB #'H,CHAR ; IF ODD THEN 'H'
82 037714 004767 000036 JSR PC,SEND ; FOR HALT
83 037720 000000 HALT
84 037722 112700 000123 TRANSF: MOVB #'S,CHAR ; EVEN ADDRESS SO 'S'
85 037726 004767 000024 JSR PC,SEND ; FOR SELF-START
86 037732 000113 JMP @LOADDR ; START USERS PROGRAM
GTLOAD GT40 LOAD HANDLER MACDLX 622(622)-1 1-FEB-81 11:36 PAGE 1-2
GTLOAD.P11
88 037734 105737 175610 GET: TSTB @#GTIS ; TEST STATUS - READY ?
89 037740 100375 BPL GET ; WAIT UNTIL READY
90 037742 113700 175612 MOVB @#GTIB,CHAR ; GET THE CHARACTER
91 037746 042700 177400 BIC #177400,CHAR ; CLEAR THE TOP BYTE
92 037752 060001 ADD CHAR,CSUM ; AND ADD INTO CHECKSUM
93 037754 000207 RTS PC ; RETURN TO CALLER
94 ;
95 037756 042700 177400 SEND: BIC #177400,CHAR ; CLEAR TOP BYTE OF CHARACTER
96 037762 110037 175616 MOVB CHAR,@#GTOB ; SEND THE CHARACTER
97 037766 105737 175614 WAIT: TSTB @#GTOS ; WAIT UNTIL CHARACTER
98 037772 100375 BPL WAIT ; HAS BEEN SENT
99 037774 000207 RTS PC ; RETURN TO CALLER
100 ;
101 037534 .END START
GTLOAD GT40 LOAD HANDLER MACDLX 622(622)-1 1-FEB-81 11:36 PAGE 1-3
GTLOAD.P11 SYMBOL TABLE
BYTECT =%000002 CHAR =%000000 CSUM =%000001 ERROR 037660
GET 037734 GETBLK 037550 GTIB = 175612 GTIS = 175610
GTOB = 175616 GTOS = 175614 LAST 037672 LOADDR =%000003
NORMAL 037636 PC =%000007 READY 037540 SEND 037756
SP =%000006 START 037534 TRANSF 037722 WAIT 037766
. = 037776
ERRORS DETECTED: 0
GTLOAD GT40 LOAD HANDLER MACDLX 622(622)-1 1-FEB-81 11:36 PAGE 1-4
GTLOAD.P11
*,LPT:GTLOAD=GTLOAD.P11
RUN-TIME: 0 0 0 SECONDS
CORE USED: 3K