File: ALIGN.TX of Disk: Disks/PDP8-Net/diag-games-kermit
(Source file text)
RK05 DISK DRIVE ALIGNMENT PROCEDURE RLM 1/23/78 --------------------------------------- THE FOLLOWING PROCEDURE IS FOR THE ALIGNMENT / PM OF AN RK05 DISK DRIVE CONNECTED TO A PDP-8 FAMILY SYSTEM (RK8E OR RKS8E CONTROLLER) ALTHOUGH IT MAY BE USED FOR A PDP-11 SYSTEM BY SUBSTITUTING AN APPROPRIATE UTILITY OR TOGGLE-IN ROUTINE. ALL ALIGNMENT DATA IS IDENTICAL. A) PULL THE DRIVE OUT AND REMOVE THE TOP COVER, REAR BOTTOM COVER, AND THE CARD CAGE FILTER COVER IN THE REAR OF THE DRIVE. CLEAN THE HEADS (EVEN IF THE DON'T LOOK DIRTY) AND ALSO THE SPINDLE WITH A "TEXWIPE" OR 91% ISOPROPAL ALCOHOL AND Q-TIPS. B) CHECK THE POWER SUPPLY VOLTAGES (REMEMBER THEY ARE SWITHCHING REGULATORS AND SOME RIPPLE WILL BE OBSERVED, BUT NO MORE THAN 200 MV.) IF IT IS NECCESSARY TO ADJUST THEM, REMEMBER THAT THE SERVO AMPLITUDES WILL CHANGE ALSO ! C) INSERT THE ALIGNMENT CARTRIGE IN DRIVE (WRITE LOCKED PLEASE !) AND GIVE IT 20-30 MINUTES WARM-UP TIME TO STABILIZE. (ESPECIALLY IF IT JUST CAME OUT OF A COLD CAR TRUNK) D) PERFORM SERVO ADJUSTMENTS -NOTE: IF AVAILABLE, USE ALIGNX FOR THE FOLLOWING PROCEDURE OR AN APPROPRIATE 8 OR 11 TOGGLE IN PROGRAM. IF ALL ELSE FAILS, THE MANUAL HAS A JUMPER PROCEDURE OR THE RK05 OFF-LINE TESTER MAY BE USED. PDP-8 TOGGLE-IN PROGRAMS ALIGNMENT OSC. SEEK --------- --------- 20/ 7201 20/ 7201 6742 7104 1033 6742 6744 1042 1034 6746 6746 7604 7604 6743 6743 6741 6741 5227 5230 2050 5220 5231 1000 1042 34/ 0000 6746 7300 6743 6741 5237 5223 42/ 3200 - CHANGE LOC 34 (OR 42 & 43) TO 0002, 0004 (3202,3204) FOR DRIVES 1,2 - SW. REG. 0-6 = CYLINDER BIT 7=1 FOR UPPER HEAD, 0 FOR LOWER - CYLINDER 105 = BITS 0,1,3,6 = 1 - 1 - SERVO ADJUSTMENT CHART - SYNC SCOPE ON PIN B05J2 (FWD H) ... EXT. + POT SIGNAL SCOPE ADJUST FOR DRIVE ALIGNX --- ------ ----- ---------- ----- ------ (6) LIMIT OFFSET A05J1 BAL. ON 0 LOADED 0000 (5) LIMIT AMP. " 3 V. DC LIMITS 0000 TOP COS AMP. A05S1 10 V. PTP 4 CYL SEEK 0402 (2) COS OFFSET " BAL. ON 0 " (3) SINE AMP A05M1 10 V. PTP 4 CYL SEEK (4) SIN OFFSET " BAL. ON 0 " BOT VEL. OFFSET " BAL. ON 0 " (7) VEL. AMP " 3.2 MS PERIOD 2 CYL SEEK 0401 H604 ACC. DRIVE A05H1 14 MS TO KNEE 64 CYL SEEK 0404 - NOTE: SEE PAGE 3 FOR EXPLAINATION OF ALIGNX SW. REG. SETTINGS E) PERFORM HEAD ALIGNMENT - IT IS IMPERITIVE THAT YOU HAVE THE PROPER TOOLS TO PERFORM THIS !!! OLD POSITIONERS REQUIRE A 45 IN.-OZ. TORQUE WRENCH AND THE NEWER (RK05J) ONES A 125 IN.-OZ. WRENCH. IF YOU FAIL TO USE THE PROPER TOOLS, THE HEAD ADJUSTMENT TAB WILL BE RUINED !! - ALIGN HEADS TO TRACK 105 (ALIGNX = 0005 LOWER / 0205 UPPER ) SCOPE: TP3 CHAN 1 TP4 CHAN 2 A02R2 EXT. SYNC (INDEX) - IF YOU ONLY HAVE TWO PROBES, YOU CAN USED EITHER TP3 OR 4 BUT IT IS BEST TO ADD TP3 + TP4 ( CHAN 2 INVERTED ). WHEN DONE, UN-INVERT CHAN 2 AND THE TWO SIGNALS SHOULD CANCEL. IF NOT, YOU HAVE G-180 PROBLEMS . F) SET INDEX DELAY PULSE TO 70 US (CAN BE UP TO 20US APART BUT MUST BALANCE AROUND 70 US) POT IS ON M7700 MODULE (AB02) - 2 - G) ADJUSTMENT OF G180 DATA SEPERATOR -THIS MUST BE DONE WITH A DATA PACK LOADED, NOT THE ALIGNMENT CART. !!! - SCOPE TP1 (ACCESS THRU REAR OF CARD CAGE) 100 NS/DIV; TRIGGER CHAN 1 INTERNAL DC + SHOULD SEE A STABLE TRACE OF 440 NS AND A JITTERY ONE AT 500 NS R55 (BOTTOM POT) ADJUSTS 440 NS R54 (TOP POT) ADJUSTS 500 NS - IF YOU CAN'T GET THE DUAL PULSES: 1) R55 (BOT) FULLY COUNTER CLOCKWISE 2) R54 (TOP) FULLY CLOCKWISE 3) R54 (TOP) COUNTER CLOCK FOR 490-500 NS 5) R55 (BOT) CLOCKWISE FOR 440 NS *** ALIGNX SWITCH REGISTER SETUP *** VERSION 3.1 SWITCH REGISTER SETUP : 0 : 1 : 2 : 3 : 4 : 5 : 6 : 7 : 8 : 9 : 10 : 11 : ----------------------------------------------------------------------- : : : : : : : : : : : : : : :SEEK :UPPER: : : : DRIVE 0-7 : : : : CYL TO SEEK : : :ALIGN:LOWER: : : : : : : : : : : : : : : : ----------------------------------------------------------------------- BITS 9,10,11 - SET TO DESIRED CYLINDER TO SEEK / ALIGN TO 0 = 0 CYL 4 = 64 CYL 1 = 2 CYL 5 = 105 CYL (ALIGN HEADS TO THIS) 2 = 4 CYL 6 = 202 CYL 3 = 16 CYL 7 = ANY CYL YOU DEPOSIT IN LOC. 37 - 3 - PDP-8A USERS R E J O I C E !! ALIGNX HAS FINALLY BEEN UPDATE TO INCLUDE A SOFTWARE SWITCH REGISTER CONSOLE PACKAGE. IT IS SIMILIAR TO ALL OTHER 8A CONSOLE PACKAGES AND IS USED AS FOLLOWS: - IMPORTANT LOCATIONS 20 - THIS IS THE SOFTWARE SWITCH REGISTER LOCATION 21 - HARDWARE CONFIGURATION 0000 = RK8E (DEFAULT) 0001 = RKS8E (CSS CONTROLLER FOR 8 DRIVES) 22 - 400 = CONSOLE PACKAGE IS ACTIVE 0 = USE HARDWARE SWITCH REGISTER THE DEFAULT CONDITIONS IS FOR ACTIVE CONSOLE, RK8E CONTROLLER USE ODT TO MAKE EITHER PERMINANT OR TEMPORARY PATCHES TO THESE LOCATIONS. - IF THE CONSOLE PACKAGE IS NOT ACTIVE, THE ONLY KEYBOARD INPUT THE PROGRAM WILL ACCEPT IS ^C (<CTRL> C), TO RETURN TO OS-8 MONITOR. IF THE CONSOLE PACKAGE IS ACTIVE, TYPE: ^C - RETURN TO OS-8 MONITOR ^D - TO MODIFY THE PSUEDO-SWITCH REGISTER ^R - RESTARTS THE PROGRAM ^U - ERASES THAT LINE JUST INPUT RETURN - TERMINATES A LINE OF INPUT ALL OTHER INPUT EXCEPT THE ABOVE AND THE NUMERIALS 0-9 ARE IGNORED. R E M E M B E R . . . THE SW CONTENTS YOU TYPE IN ARE EXACTLY AS YOU WOULD SET INTO THE HARDWARE SWITCHES, WERE THEY AVAILIBLE. ====> NOTE: THERE IS A FEATURE TO CHANGE THE DISK CONTROLLER IOT'S. START THE PROGRAM AT LOC 210 WITH THE NEW DEVICE CODE IN THE SWITCH REGISTER (OR ANSWER THE SR = QUESTION IF THE CONSOLE PACKAGE IS ACTIVE.) - 4 -