ABSTRACT
In the controller as shown in Fig. 4, executing and calculating of program are accomplished by a chip of program memory (EPROM 2764,8k), a chip of data memory (SRAM 6264,8k) and 232 bit registers in 8098 single-chip computer. The man-machine interface, for instance display of data and input of control keys etc, are accomplished by a general display I key control IC 8279. Digital value I/ 0, involving the directional valve control signal, the pressure measuring of hydraulic system, and oil filter resistance alarm etc, uses a chip of programmable general interface 8255 to realize.
