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7af5ad59 PH |
1 | /4 TD8E HANDLER FOR BUILD..TD8E-C |
2 | / | |
3 | / | |
4 | / | |
5 | / | |
6 | / | |
7 | / | |
8 | / | |
9 | / | |
10 | / | |
11 | /COPYRIGHT (C) 1974,1975,1977 BY DIGITAL EQUIPMENT CORPORATION | |
12 | / | |
13 | / | |
14 | / | |
15 | / | |
16 | / | |
17 | / | |
18 | / | |
19 | / | |
20 | / | |
21 | / | |
22 | /THE INFORMATION IN THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE | |
23 | /AND SHOULD NOT BE CONSTRUED AS A COMMITMENT BY DIGITAL EQUIPMENT | |
24 | /CORPORATION. DIGITAL EQUIPMENT CORPORATION ASSUMES NO RESPONSIBILITY | |
25 | /FOR ANY ERRORS THAT MAY APPEAR IN THIS DOCUMENT. | |
26 | / | |
27 | /THE SOFTWARE DESCRIBED IN THIS DOCUMENT IS FURNISHED TO THE PURCHASER | |
28 | /UNDER A LICENSE FOR USE ON A SINGLE COMPUTER SYSTEM AND CAN BE COPIED | |
29 | /(WITH INCLUSION OF DIGITAL'S COPYRIGHT NOTICE) ONLY FOR USE IN SUCH | |
30 | /SYSTEM, EXCEPT AS MAY OTHERWISE BE PROVIDED IN WRITING BY DIGITAL. | |
31 | / | |
32 | /DIGITAL EQUIPMENT CORPORATION ASSUMES NO RESPONSIBILITY FOR THE USE | |
33 | /OR RELIABILITY OF ITS SOFTWARE ON EQUIPMENT THAT IS NOT SUPPLIED BY | |
34 | /DIGITAL. | |
35 | / | |
36 | / | |
37 | / | |
38 | / | |
39 | / | |
40 | / | |
41 | / | |
42 | / | |
43 | / | |
44 | / | |
45 | *0 | |
46 | -2 | |
47 | DEVICE TD8C;DEVICE DTA4;4210;4012;ZBLOCK 2 | |
48 | DEVICE TD8C;DEVICE DTA5;4210;4016;ZBLOCK 2 | |
49 | ||
50 | SDSS=6751 /SKIP ON SINGLE LINE FLAG | |
51 | SDST=6752 /SKIP ON TIME ERROR | |
52 | SDSQ=6753 /SKIP ON QUAD LINE FLAG | |
53 | SDLC=6754 /LOAD TAPE COMMAND REGISTER | |
54 | SDLD=6755 /LOAD DATA REGISTER | |
55 | SDRC=6756 /READ COMMAND REGISTER | |
56 | SDRD=6757 /READ DATA REGISTER | |
57 | ||
58 | TDVERSION="D&77 | |
59 | ||
60 | /V3 CHANGES: | |
61 | ||
62 | /1. VERSION # IS NOW 1 | |
63 | /2. PARITY ^C IS NOW LEGAL | |
64 | /3. INITIALIZATION BUG FIXED | |
65 | /4. ^C CHECK NO LONGER ADVANCES READER | |
66 | /MAINTENANCE RELEASE CHANGES: | |
67 | ||
68 | /5. FIXED ^C BUG | |
69 | /6. MADE CODING IMPROVEMENTS | |
70 | /7. FIXED RETRY BUG | |
71 | ||
72 | ||
73 | ||
74 | *200 | |
75 | ||
76 | NXINIT, 7600 /CLEAR AC HERE!!! | |
77 | JMS I CINIT2 /PART OF INITIALIZATION..DO THE PART | |
78 | BASE2, DCA JINIT /ON SECOND PAGE AND THEN TO JINIT | |
79 | JMP JINIT | |
80 | CRDQAD, R4LINE-BASE | |
81 | CINIT2, INIT2-BASE | |
82 | CSELCT, SELECT-BASE | |
83 | CXUNIT, XUNIT-BASE | |
84 | ||
85 | BUFF, 4000 /V3 | |
86 | PGCT, 0 | |
87 | ||
88 | DTA0, TDVERSION /ENTRY FOR UNIT 0 | |
89 | CLA CLL | |
90 | JMP DTA1X | |
91 | UNIT, 0 /FILLER WORD | |
92 | DTA1, TDVERSION /ENTRY FOR UNIT 1 | |
93 | CLA CLL CML | |
94 | TAD DTA1 | |
95 | DCA DTA0 /PICK UP ARGS AT DTA0 | |
96 | DTA1X, RAR | |
97 | DCA UNIT /UNIT # FROM LINK | |
98 | RDF | |
99 | TAD C6203 | |
100 | DCA LEAVE /SET UP EXIT FROM HANDLER | |
101 | JINIT, JMP INIT | |
102 | TAD I DTA0 | |
103 | DCA FUNCT /SAVE FUNCTION WORD | |
104 | TAD FUNCT | |
105 | CLL RAL | |
106 | C200, AND CM200 /GET A PAGE COUNT | |
107 | DCA PGCT | |
108 | TAD FUNCT | |
109 | C374, AND C70 /ISOLATE FIELD OF TRANSFER | |
110 | TAD C6203 | |
111 | DCA XFIELD | |
112 | ISZ DTA0 /POINT TO BUFFER | |
113 | TAD I DTA0 | |
114 | DCA BUFF | |
115 | ISZ DTA0 /POINT TO RECORD | |
116 | TAD I DTA0 | |
117 | CLL RAL /CONVERT TO DECTAPE BLOCKS | |
118 | DCA TBLOCK | |
119 | ISZ DTA0 /POINT TO ERROR RET. | |
120 | C6203, CIF CDF 0 | |
121 | \f | |
122 | CLA CLL CMA RTL | |
123 | DCA ERCNT /3 ERROR TRIES | |
124 | TAD UNIT | |
125 | DCA I CXUNIT | |
126 | JMS I CSELCT /CHECK FOR SELEC ERROR | |
127 | JMP .-1 /LOOPS IF NO ^C AND SELECT ERROR | |
128 | TAD FUNCT | |
129 | CLL RAR | |
130 | JMP GO /OK.. START THE SEARCH | |
131 | TRWCOM, SDST /TIME OR CHECK SUM ERROR? | |
132 | SZA CLA | |
133 | JMP TRY3 /YES TRY UP TO 3 TIMES | |
134 | TAD PGCT /NO.. IS PAGE COUNT EXHAUSTED? | |
135 | TAD CM200 | |
136 | SNA | |
137 | JMP EXIT /YES.. DONE THIS TRANSFER | |
138 | DCA PGCT /NEW PAGE COUNT | |
139 | ISZ TBLOCK | |
140 | TAD BUFF | |
141 | TAD C200 /GET NEW BUFFER ADDRESS | |
142 | DCA BUFF | |
143 | CLL CML /FORCE FORWARD MOTION | |
144 | GO, CLA CML RTR /PUT IN DIRECTION BIT | |
145 | TAD C1000 | |
146 | TAD UNIT | |
147 | SDLC /INITIATE THE MOTION | |
148 | JMS I CRDQAD /WAIT FOR 8 LINES TO PASS | |
149 | JMS I CRDQAD | |
150 | M20, 7760 /DON'T CARE IF IT DOES SKIP!!! | |
151 | TSRCH, SDSS /WAIT\ f FOR BLOCK MARK OR END ZONE | |
152 | JMP .-1 | |
153 | SDRC | |
154 | CLL RTL /DIRECTION TO LINK, DATA TO AC 4-9 | |
155 | AND C374 /ISOLATE M.T BITS | |
156 | TAD M110 /IS IT END ZONE? | |
157 | SNA | |
158 | JMP ENDZ /YES..DO SOMETHING REASONABLE | |
159 | TAD M20 /HOW ABOUT BLOCK MARK? | |
160 | SZA CLA | |
161 | JMP TSRCH /NEITHER..KEEP LOOKING | |
162 | SDRD /WHAT IS THIS BLOCK'S #? | |
163 | SZL /IF IN REVERSE, LOOK FOR 3 BEFORE | |
164 | TAD TC3 /THE ACTUAL TARGET BLOCK | |
165 | CMA | |
166 | TAD TBLOCK | |
167 | CMA | |
168 | SNA /IS THIS THE BLOCK? | |
169 | JMP TFOUND /YES..HAVE CORRECT ONE | |
170 | M110, SZL SNA CLA /ARE WE HEADED PROPERLY? | |
171 | JMP TSRCH /YES.. KEEP LOOKING | |
172 | ENDZ, SDRC /IF WE ARE IN END ZONE FORWARD, WE LOSE | |
173 | CLL RTL | |
174 | JMP GO /EXECUTE TURN AROUND AND SEARCH | |
175 | \fTRY3, CLA CLL /V3C | |
176 | ISZ ERCNT /TRIED 3 TIMES? | |
177 | JMP GO | |
178 | JMP FATAL | |
179 | EXIT, ISZ DTA0 /NORMAL RETURN | |
180 | CLL CML | |
181 | FATAL, TAD UNIT /STOP TAPE FIRST | |
182 | SDLC | |
183 | CLA CML RAR /EITHER 0 OR 4000 IN AC | |
184 | LEAVE, HLT /GETS CIF CDF N | |
185 | JMP I DTA0 | |
186 | ||
187 | INIT, JMS . /FIND OUT WHERE WE GOT LOADED | |
188 | BASE, TAD CRDQAD | |
189 | SPA /NEGATIVE ENDS LIST | |
190 | JMP NXINIT | |
191 | TAD INIT | |
192 | DCA CRDQAD | |
193 | ISZ .-1 | |
194 | ISZ BASE | |
195 | JMP BASE | |
196 | ||
197 | FUNCT, 0 | |
198 | C1000, 1000 | |
199 | ||
200 | *367 | |
201 | TFOUND, SZL CLA /ARE WE IN RIGHT DIRECTION | |
202 | JMP GO /NOT YET | |
203 | TAD FUNCT | |
204 | CLL RAL /R/W TO LINK | |
205 | CLA | |
206 | C70, 70 | |
207 | TC3, 3 | |
208 | TAD BUFF | |
209 | XFIELD, HLT /CONTROL 'TRICKLES THROUGH | |
210 | ||
211 | TBLOCK=DTA1 | |
212 | ERCNT=INIT+1 | |
213 | CM200=NXINIT | |
214 | DTA2=DTA0 | |
215 | DTA3=DTA1 | |
216 | DTA4=DTA0 | |
217 | DTA5=DTA1 | |
218 | DTA6=DTA0 | |
219 | DTA7=DTA1 | |
220 | \f *400 | |
221 | CIF 0 /WE ARE IN FIELD 0 | |
222 | DCA XBUFF | |
223 | RAR | |
224 | DCA XFUNCT /READ/WRITE TO FUNCTION | |
225 | RGRD, SDSS | |
226 | JMP .-1 /LOOK FOR REVERSE GUARD PATTERN | |
227 | SDRC | |
228 | AND K77 | |
229 | TAD CM32 | |
230 | SZA CLA /IF NOT REV. GUARD, KEEP LOOKING | |
231 | JMP RGRD | |
232 | TAD C7600 | |
233 | DCA WORDS /128 WORDS/BLOCK | |
234 | TAD XFUNCT | |
235 | K7700, SMA CLA /IS IT READ OR WRITE? | |
236 | JMP TREAD | |
237 | SDRC /CHECK FOR WRITE LOCKOUT | |
238 | AND TC300 | |
239 | CLL /SETUP TO RETRY IF WRITE LOCK | |
240 | SZA CLA | |
241 | JMP I CTRY3 /IF LOCKED OUT, ERROR | |
242 | JMS R4LINE /SKIP A WORD | |
243 | C7600, 7600 /CLA | |
244 | TAD C1400 | |
245 | TAD XUNIT | |
246 | SDLC /TURN ON WRITE HEAD | |
247 | CLA CMA | |
248 | JMS W4LINE /7777 IN REV. CHECKSUM | |
249 | CLA CMA | |
250 | DCA CSUM /AND ALSO TAPE CHECKSUM | |
251 | WRTLP, TAD I XBUFF | |
252 | JMS W4LINE | |
253 | ISZ XBUFF /INCREMENT BUFF. ADD. | |
254 | K77, 77 | |
255 | ISZ WORDS /DONE A BLOCK? | |
256 | JMP WRTLP | |
257 | JMS W4LINE /A 129 TH WORD OF 0 | |
258 | JMS GCHK /GET 6 BIT CHECKSUM | |
259 | JMS W4LINE /WRITE IT TO TAPE | |
260 | JMS W4LINE /LET CHECK SUM FINISH | |
261 | JMP I CRWCOM /SEE IF WE ARE FINISHED | |
262 | \f | |
263 | TREAD, JMS R4LINE | |
264 | JMS R4LINE /SKIP CONTROL WORDS | |
265 | JMS R4LINE | |
266 | AND K77 /CHECKSUM | |
267 | TAD K7700 | |
268 | DCA CSUM | |
269 | RDLP, JMS R4LINE | |
270 | JMS EFUN /ADD WORD TO CHECKSUM | |
271 | DCA I XBUFF | |
272 | ISZ XBUFF | |
273 | TC300, 300 | |
274 | ISZ WORDS /DONE BLOCK? | |
275 | JMP RDLP | |
276 | JMS R4LINE | |
277 | JMS EFUN /CHECK SUM 129 TH WORD | |
278 | JMS R4LINE | |
279 | AND K7700 /READ CHECKSUM | |
280 | JMS EFUN | |
281 | JMS GCHK /COMPARE TAPE AND OUR CHECKSUM | |
282 | JMP I CRWCOM | |
283 | ||
284 | W4LINE, 0 /ADD TO CHECKSUM AND WRITE A 12 BIT | |
285 | JMS EFUN /WORD | |
286 | SDSQ | |
287 | JMP .-1 /SKIP ON QUAD LINE FLAG | |
288 | SDLD | |
289 | CLA /AC IS NOT CLEARED AFTER SDLD | |
290 | JMP I W4LINE | |
291 | ||
292 | R4LINE, 0 /WAIT FOR QUAD FLAG AND READ | |
293 | SDSQ | |
294 | JMP .-1 | |
295 | SDRD | |
296 | JMP I R4LINE | |
297 | ||
298 | EFUN, 0 /COMPUTE EQUIVALENCE CHECKSUM | |
299 | CMA | |
300 | DCA ETMP /ACTUALLY CHECKSUMS ON DECTAPE ARE | |
301 | TAD ETMP /EQUIVALENCE OF ALL WORDS IN A RCORD | |
302 | AND CSUM /6 BITS AT A TIME. SINCE EQUIVALENCE | |
303 | CIA /IS ASSOCIATIVE WE DO IT 12 AT A TIME | |
304 | CLL RAL /AND CONDENSE LATER. | |
305 | TAD ETMP /IDENTITIES USED ARE: | |
306 | TAD CSUM /A+B=(A.XOR.B)+2*(A.AND.B) | |
307 | DCA CSUM /A.EQU.B=.NOT.(A.XOR.B)=A.XOR.(.NOT.B) | |
308 | TAD ETMP /A.EQU.B=(A+(.NOT.B))-2*(A.AND.(.NOT.B)) | |
309 | CMA | |
310 | JMP I EFUN | |
311 | ||
312 | \fGCHK, 0 /FORM 6 BIT CHECKSUM | |
313 | CLA | |
314 | TAD CSUM | |
315 | CLL CMA RTL | |
316 | RTL | |
317 | RTL | |
318 | JMS EFUN | |
319 | CLA CLL CML | |
320 | TAD CSUM | |
321 | AND K7700 | |
322 | JMP I GCHK | |
323 | ||
324 | INIT2, 0 /TIS INITIALIZES LOCS IN PAGE 2 | |
325 | INIT3, TAD CTRY3 | |
326 | SNA | |
327 | JMP I INIT2 /0 ENDS LIST | |
328 | TAD INIT2 | |
329 | DCA CTRY3 /UPDATE THE LIST | |
330 | ISZ .-1 | |
331 | ISZ INIT3 | |
332 | JMP INIT3 | |
333 | ||
334 | CTRY3, TRY3-BASE2 | |
335 | CRWCOM, TRWCOM-BASE2 | |
336 | XBUFF, 0 /0 MUST TERMINATE IT!! | |
337 | CM32, -32 | |
338 | C1400, 1400 | |
339 | ||
340 | SELECT, 0 /THIS ROUTINE CHECKS FOR SELECT | |
341 | TAD XUNIT /AND ^C TYPED | |
342 | SDLC | |
343 | SDRC /GET STATUS AND SEE IF SELECT ERROR ON | |
344 | AND C100 | |
345 | SNA CLA | |
346 | ISZ SELECT /NOPE .TAKE NORMAL OUT | |
347 | KSF /SEE IF FLAG IS UP | |
348 | JMP I SELECT /NO..EXIT | |
349 | TAD C7600 | |
350 | KRS | |
351 | TAD (-7603 /IS IT ^C? | |
352 | SZA CLA | |
353 | JMP I SELECT /NO..EXIT | |
354 | JMP I C7600 | |
355 | ||
356 | C100, 100 | |
357 | ||
358 | XFUNCT=INIT2 | |
359 | CSUM=XFUNCT+1 | |
360 | WORDS=CSUM+1 | |
361 | ETMP=WORDS+1 | |
362 | XUNIT=ETMP+1 | |
363 | $$$$$$$ | |
364 | \f |