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1975年后研制的MFM读写系统包括编译码电路、读写电路和自同步电路,参阅图1。全部电路利用757计算机及其驱动器(容量为29 MB)进行了考验和试用,证明系统是完整、可靠的。 MFM读写电路由写入电路、磁头选择电路和读出电路等组成。本文着重介绍读出电路。读出电路包括二极管门电路、前置放大器、模拟门电路、低通滤波器、自动增益放大、均衡器、微分电路、过零检测、幅度检测和整形电路等环节,其框图见图2。
MFM read and write system developed after 1975 includes codec circuit, read-write circuit and self-synchronization circuit, see Figure 1. All circuits were tested and tested with the 757 computer and its drives (29 MB capacity) to prove the system was complete and reliable. MFM read and write circuit by the write circuit, the head selection circuit and readout circuit and other components. This article focuses on the readout circuit. The readout circuit includes the diode gate, preamplifier, analog gate, low pass filter, automatic gain amplifier, equalizer, differential circuit, zero crossing detection, amplitude detection and shaping circuit.