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本文提出一种价廉而功能又强的 EPROM 读写卡,它与主机相连可对2716、2732、2764、27128等EPROM 芯片进行快速编程、校验、读出、复制和核查。现以 MCS-51单片机作为主机,介绍EPROM 读写卡(以下简称 EPROM 卡)的硬、软件设计。(一)EPROM 卡硬件原理读写卡主要由可编程 I/O 芯片8255A 构成,如图1所示。8255A 地址为7FFC—7FFFH。U_1为 EPROM 卡的工作程序,芯片2716供存放快速编程、复制、校对、核查、读出等程序,其地址为0000H—07FFH。U_3、U_4为28脚双列直插插座。U_3用于插入被编程的 EPROM 芯片,用来固化主机内存中的内容或插在 U_4插座的EPROM 母片中的内容。U_4用于插入被复制的
This paper presents a cheap and powerful EPROM card reader connected to the host can be 2716,2732,2764,27128 EPROM chips such as fast programming, calibration, read out, copy and verify. Is to MCS-51 microcontroller as the host, introduced EPROM read-write card (hereinafter referred to as EPROM card) hardware and software design. (A) EPROM card hardware principle Reading and writing card is mainly composed of programmable I / O chip 8255A, as shown in Figure 1. 8255A is at 7FFC-7FFFH. U_1 is the working program of EPROM card. The chip 2716 is used for storing programs such as fast programming, copying, proofreading, checking and reading, and the address is 0000H-07FFH. U_3, U_4 28-pin dual in-line socket. U_3 is used to insert the programmed EPROM chip to cure the contents of the host memory or the contents of the EPROM chip inserted in the U_4 socket. U_4 is used to insert the copied