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General| Brand | Commodore |
|---|---|
| Model | 8250LP |
| Category | Floppy Disk Drive |
| Language | English |
Describes the JU-570 minifloppy diskette drive's physical characteristics and internal components.
Details the methods used for encoding data on the diskette, FM and MFM.
Specifies unformatted data storage capacities per diskette and per track.
Lists formatted capacities for 16 records/track, distinguishing hard/soft formats.
Provides formatted capacities for 10 records/track, for hard or soft formats.
Details formatted capacities for 18 records/track, specifically for soft formats.
Specifies data transfer rates in bits and bytes per second.
Recommends the MCI Minidiskette for double-sided, double-density drives.
Specifies operating, shipping, and storage temperature ranges for the drive.
Outlines acceptable relative humidity levels for operation, shipping, and storage.
States the maximum wet bulb temperature allowed without condensation.
Advises on acclimatization time for diskettes after significant temperature changes.
Defines acceptable error rates for soft read, hard read, and seek operations.
Lists media-related reliability figures like diskette insertions and clamping.
Specifies the Mean Time Between Failures (MTBF) for the drive, including duty cycle.
States that no preventative maintenance is required for the drive.
Provides the Mean Time To Repair (MTTR) for the drive.
Indicates expected lifespan for components and media in terms of passes per track.
Lists required DC input voltages, tolerances, ripple, and power consumption in watts and BTU/Hr.
Details mechanical specifications like seek settle time, motor start time, and head geometry.
Describes acceptable mounting orientations for the diskette drive.
Covers electrical characteristics of drive motor, stepping motor, and read/write channel, including resistance and performance.
Introduces the specification for the physical and electrical interface of the JU-570 diskette drive.
Describes the physical interface for the Read/Write (R/W) head using Connector P2, including its schematic.
Lists specific connector parts for P1 and P2, including housing, contacts, and PCB headers.
Details the recommended circuit for the write operation, including current requirements and timing.
Presents the recommended interface circuit for the read operation, specifying signal amplitudes and clamping.
Shows the recommended interface circuit for the erase coil, including DC current requirements.
Details the physical interface for stepper motor, drive motor, write protect, Track 00, and active LED using Connector P1.
Lists the specific connector housing, contacts, and PCB header parts for Connector P1.
Explains stepper motor input requirements, wiring, and the two-phase drive phase table.
Illustrates timing diagrams for stepper motor control signals in two-phase drive mode.
Describes voltage switching for the stepper motor to manage power consumption when idle.
Explains the input signal for turning on the drive motor, including delays and timing.
Details the interface for the write protect switch using a photo detector.
Explains the TRACK 00 signal's function in preventing noise and controlling stepper motor direction.
Describes the interface for the active LED on the drive's faceplate.
Specifies the grounding requirements for the drive frame, addressing different system configurations.
Details DC power requirements, including voltages, current contributions, and motor start surge.
