Commodore 8250LP Technical Manual Download Page 1 | Manualshive

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Summary of Contents for 8250LP

Page 1: ...ce information only Part numbers are for reference only Only parts on current dealer parts list are available No license is given for any use by possession of these documents and may not be reproduced...

Page 2: ...CONTENTS I GENERAL rL CAPACITY m MEDIA IV ENVIRONMENTAL V RELIABILITY VI POWER VU DRIVE VlII INTERFACE IX SUGGESTED GENERAL CONTROL DATA TIMING REQUIREMENTS X PHYSICAL OUTLINE XI PARTS LIST 1...

Page 3: ...Unformatted Bits Diskette 4 000 000 8 000 000 Bits rack 25 000 50 000 C Formatted 16 Records Track Hard or Soft Bits Diskette 2 621 440 5 242 880 Bits l rack 16 384 32 768 Bits Sector 1 024 2 048 D Fo...

Page 4: ...n Change 15 C Change should allow 1 hour for diskette to stabilize to ne environment v RELIABILITY Error Rate ihen used wi th CI recommend circuits or eqiv Soft read errors 2 retries min n 1 per 10 bi...

Page 5: ...access time Drive Motor Start Time Rjlf Head Head load Radial align hysteresis Azimuth Iodulation m Spindle Speed B lour1ting F on1 Loading 42 7 12 5 18 ms m Consisting of 3 ms track to track seek ti...

Page 6: ...8 0 _ 30 ohms 3 3 _ 30 1J H Test criteria Head and Carriage Rotational speed 300 rpm Track radius at track 77 Fre uency 125 kHz Load pad pressure 17 3 grams rri te current 6 3 0 2 M A p p Average rea...

Page 7: ...R Wl E ASE d e 1 NC ER ASe R N 1 COMMON R W2 GNO P1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 PZ 1 3 5 7 9 1 1 2 4 6 8 10 12 HEn ORA SPINDLE OTOR BLK CONTROL PCB HI HI GRN r r I...

Page 8: ...tic head as shown in figure 2 c J 1 2 c J 3 4 Q c J 5 6 c J 7 B c J 9 10 c J 11 12 3 KEY Fig 2 P2 Connector B 2 Schematic P2 5 R W2 CRED l GND YEL 11 ERAS c Grt i i R Vi CT WHT 9 R Wl ELK 10 R W2 RED...

Page 9: ...5 from leading edge to leading edge Proper write damping must be considered during design for write transitions Note The head must be loaded for proper write operation 4 2SA720 or Eq 4 MA162 or Eq P2...

Page 10: ...of 20 mY occurs on TRK 00 at a frequency of 625 kHz The customer is cautioned to use propzr clamping for the read operation A recommended interface is shown in figure 4 n 4 MA 162 tt orEq r I 12VA 2...

Page 11: ...and write current should be started and ended simultaneously A recommended interface for the erase coil is sho n in figure 5 Delaied Wri te Gate 90gn 1 8W l v A __ __ 4n 1 8W l v to Fig 3 ___________...

Page 12: ...hysical interface to stepper drive motor write protect Track OO and Inde EOUSn G c l 4 I I I I I til 1 1 aaL __ _ Ji fi II r Q II_I I I t 4 II i I I _I C I I I _ r l 1 I i L _____I I Fig 6 Connector R...

Page 13: ...ize Both red center taps go to 12V DC and go to 5V DC for unselected drive For selected drive an appropriate two phases are connected to ground PHASE T BLE T W PHASE DRIVE TRK POSITION I S ID 3 I S ID...

Page 14: ...R rVE STEP STEP SELECT DIRECTION S W 3 SMD 2 SMD 4 S 1O 1 4n 0 I C L Stepper Voltage he no step command 1 2 3 to inner or riO selec ed ste per is s i tched to 5V to avoid 4 t 3 I 1 12Y 5v 2 I to outer...

Page 15: ...motor and diskette life and decrease pOlver consumption System timing must be analyzed to determine optimum delay bebieen deselection of drive s and turning off motor s Shown below is one of examples...

Page 16: ...Writing on the diskette is inhibited on the drive when the diskette is write protected F TRACK 00 The drive need the 11L CK 00 signal to obstruct BUMP NOISE in recal motion USER should prepare the lo...

Page 17: ...G ACTIVE LED Drive have the interface of the active led on the face plat Recomended interface is shown in Fig 10 sv Pl 17 or I V Active Led _____ p 1 _1_8__ 1 Red Wy 330n 174LS05 or E l Fig 10 16...

Page 18: ...0 _ 0 6 VDC 1 2A max 75A typical 100 mv max allowable p p ripple Hotor start surge see below The 12V current is composed of tw o components diskett drive motor current and read write steppe functions...

Page 19: ...M D 500as Max I V PROT OUT I I Ims SIDE SELECT Min I ____________ J l s Min l I DlRECTION I I I 1 ms I I l c s 2 rs Min 30 rs M in I I l Min r STEP Min 2 Minj 2ms 18ms 1 in I I I I 8 rs Me WRITE GATE...

Page 20: ...X PHYSICAL OUTLINE r o _I I I C N I 167 I i I I Fig 12 m I...

Page 21: ...1 9 YJF2E00590B4 GUIDE ROD 2 10 333046331360 CLAMP GUIDE ROD 1 11 YJF2E00580B4 CLAMP GUIDE ROD 2 1 12 YJUFS6HCA 2 R W HEAD ASS Y 1 13 YJF2H00681B3 SHIELD PLATE 1 16 YJF2E00631B4 GUIDE SHAFT ASS Y 1 1...

Page 22: ...21...

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