一、问题的引出 TP801BI板是北工大推出的与TP801B单板机相配的48K RAM扩展板。它可以使TP801B的存储容量扩大成64K,同时也为用户在TP801 B上外接其它设备和接口提供了方便。但是,TP801BI板在DMA方式应用时,却存在一定的问题。在我们的应用中,DMA方式记带是指把采入的地震信号数据直接从TP801B的内存送入磁带机的数据缓存器,磁带机接收数据后,执行写带操作,把数据记到磁带上。由于数据量较大,我们采用了TP801BI板,即在单板机 First, the problem leads TP801BI board is launched by Beigong with the TP801B single board machine 48K RAM expansion board. It can make TP801B storage capacity expanded to 64K, but also for users in the TP801 B external devices and interfaces to provide additional convenience. However, TP801BI board in the DMA mode, there are some problems. In our application, DMA mode is to bring the seismic data collected directly from the memory of the TP801B into the data buffer of the tape drive. After the tape drive receives the data, the tape write operation is performed and the data is recorded on the tape . Due to the large amount of data, we use the TP801BI board, that is, in the single board machine