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CROMEMCO系统3/D系列机在68000 CROMIX分时操作系统下,存在512ms间隔的时钟中断和外设中断,用户软件不能进行A/D,D/A转换。为了克服“中断”信号的干扰,可由外加单板机(即在单板机上加A/D,D/A芯片,把经A/D采样后的数存入到单板机的RAM存储器中,然后把单板板RAM存储器中的数据经RS232接口送入主机)和屏蔽64FDC板子的中断源来实现转换。但以上两种方法分别存在一定缺陷,前者成本高,受单板机内存
CROMEMCO system 3 / D series machine in 68000 CROMIX time-sharing operating system, there is a 512ms interval clock interrupt and peripheral interrupt, user software can not A / D, D / A conversion. In order to overcome the interference of the “interrupt” signal, an external single-board computer (that is, adding A / D and D / A chips on the single-board computer and storing the number after the A / D sampling into the RAM of the single- Then the data in the single board RAM memory is sent to the host through the RS232 interface) and the interrupt source of the 64FDC board is shielded to achieve the conversion. However, there are some flaws in the above two methods, respectively. The former is costly and subject to the memory of the single-board computer