INHALT

* NAME: LDR-APM DOC. 70180005000 REV. E PAGE 7

0274 * THE PROGRAM NAME TO BE LOADED(THE PROGRAM NAME 0275 * MUST BE PRESENT IN THE DOP DIRECTORY). THE 0276 * LOADER THEN LOADS THE REQUESTED PROGRAM. 0277 * 0278 * ON THE DDP-416, THE COMPUTER WILL HALT AGAIN. 0279 * SET THE A-REGISTER WITH THE LOCATIUN AT WHICH 0280 * THE CROSS-SECTOR INDIRECT WORD TABLE IS TO BEGIN. IF THE 0281 * A-REGISTER IS CLEAR, A STARTING LOCATION OF '100 WILL BE 0282 * ASSUMED. 0283 * 0284 * 0285 * 4. PRESS 'START'. LOADING WILL PROCEED UNTIL A MESSAGE IS 0286 * TYPED. 0287 * 0288 * 0289 * 0290 * ******************************************************************** 0291 * * LOADER MESSAGES * 0292 * ******************************************************************** 0293 * 0294 * A MESSAGE IS TYPED WHENEVER THE LOADER HALTS FOR ANY REASON. 0295 * AT THIS TAIME THE INPUT DEVICE WILL BE DISPLAYED IN THE A REGISTER, 0296 * UPON SUCH A HALT THE OPERATOR HAS THE FOLLOWING OPTIONS.. 0297 * 0298 * 1. TO BEGIN A FRESH LOAD SET THE PROGRAM COUNTER TO 'XX000 0299 * OR 'XX006, SET THE A AND B REGISTERS AS DESCRIBED ABOVE IN 0300 * LOADER OPERATING PROCEDURE AND PRESS 'START'. THE LOADER 0301 * STATUS IS COMPLETELY RESET BEFORE PROCEEDING. ALL SYMBOL 0302 * AND BASE SECTOR ENTRIES ARE CLEARED. THE PROGRAM AND 0303 * COMMON COUNTERS ARE RESET. 'XX000 INITIALIZE THE LOADER FOR 0304 * 'NORMAL' DESECTORIZING WHILE 'XX006' INITIALIZES IT FOR 0305 * EXTENDED DESECTORIZING. 0306 * 0307 * 2. IF THE TAPE RUNS OUT OF THE TAPE READER 0308 * (BECAUSE OF A MISSING 'END-OF-TAPE' BLOCK), STOP THE 0309 * COMPUTER BY MOMENTARILY PLACING THE CPU IN SINGLE- 0310 * INSTRUCTION MODE, SET THE PROGRAM COUNTER TO 'XX001, 0311 * AND PRESS 'START'. 0312 * 0313 * 3. IF A MEMORY MAP IS DESIRED, SET THE PROGRAM COUNTER TO 0314 * 'XX002 AND PRESS 'START'. 0315 * 0316 * 4. TO CONTINUE LOADING, BUT WITH A NEW ORIGIN, SET THE PROGRAM 0317 * COUNTER TO 'XX003, SET THE A REGISTER TO THE LOCATION WITH 0318 * WHICH LOADING IS TO CONTINUE AND PRESS 'START'. IF THE 0319 * A-REGISTER IS CLEAR, THE ORIGIN WILL REMAIN UNCHANGED. 0320 * 0321 * 5. TO FORCE LOAD THE NEXT SUBPROGRAM (EVEN IF IT HAS NOT 0322 * BEEN CALLED) SET THE PROGRAM COUNTER TO 'XX004, AND 0323 * PRESS 'START'.