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一、DG0040系列四位微计算机DG0040系列是北京八七八厂生产的四位机电路,采用硅栅N沟道E/D MOS工艺,单电源5V,可直接与TTL、CMOS、NMOS等电路相匹配,使用十分方便.最小系统由三片构成:DG0040(CPU+RAM)DG0041(显示振荡),DG0042(ROM)或EPROM.在此基础上可采用配套的通用I/O接口电路片DG0046或其它中小规模电路加以扩充,以适应不同应用对象的要求.0040的内部RAM为256×4位,ROM直接寻址范围达8K字节,是功能较强的所谓“计算型”四位机.图2-1为该机的逻辑框图.由于ROM一般常用EPROM来代替,如2716、2732等通用芯片,大家均
First, DG0040 series of four micro-computer DG0040 series is Beijing eight seven eight factory production of four-bit circuit, the use of silicon gate N-channel E / D MOS technology, a single power supply 5V, TTL, CMOS, NMOS and other circuit phase Matching, easy to use. The minimum system consists of three: DG0040 (CPU + RAM) DG0041 (display oscillation), DG0042 (ROM) or EPROM. On this basis can be used to support the general-purpose I / O interface chip DG0046 or other Small and medium-sized circuit to be expanded to meet the requirements of different applications .0040 internal RAM 256 × 4, ROM direct addressing range of up to 8K bytes, is a more powerful so-called “computing ” four machine. Figure 2-1 is the logical block diagram of the machine. Because ROM is generally used to replace EPROM, such as 2716, 2732 and other common chips, we all