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General| Processor | Intel 8088 |
|---|---|
| Clock Speed | 4.77 MHz |
| RAM | 128 KB, expandable to 896 KB |
| Operating System | MS-DOS |
| Floppy Drive Capacity | 1.2 MB per drive |
| Display | Built-in monochrome display |
| Text Resolution | 80 x 25 characters |
| Graphics Resolution | 800 x 400 pixels |
| Ports | Parallel, serial, video output |
Explains how the read/write head is positioned over the desired track using stepper motors.
Details the technique for varying diskette rotation speed to maintain constant bit density.
Describes the process of writing data onto the diskette using a 10-bit GCR code.
Explains how data is recovered from the diskette using a read amplifier, PLL, and GCR decoder.
Details the architecture, registers, and addressing modes of the 8088 microprocessor.
Explains how the microcomputer controls data flow using address and data buses.
Describes the timing signals and sequences for accessing system memory.
Details how the 8259 Programmable Interrupt Controller manages system interrupts.
Describes the HD46505 CRT Controller Chip and its interface signals with the 8088.
Describes the expansion bus composed of 50-pin connectors for adding peripheral boards.
Details the electro-mechanical components of the disk drive subsystem.
Troubleshooting steps for missing voltages in the power supply section.
Troubleshooting steps for the unregulated +12V output of the power supply.
Troubleshooting steps for the regulated +12V output of the power supply.
Troubleshooting steps for the -12VDC output of the power supply.
Troubleshooting steps for failures in the disk drive's head positioning (seek) logic.
Troubleshooting steps for failures related to disk drive motor speed control.
Troubleshooting steps for failures in the disk drive's write logic.
Analysis of the read circuit to diagnose read failures.
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