16 position rotary switch for hex input Found this post for a better input possibility:
16 position rotary switch for hex input
8 bit computer, ALU complete
8 bit computer, ALU complete Everything is connected now on the ALU board. the bus has been connected (blue wires) the A register is connected to the ALU chips (purple wires) the B register is connected to the ALU chips
8 bit computer, building up the ALU
8 bit computer, building up the ALU The ALU Building up the heart of the computer, the two big chips are 74LS181’s (4 bit ALU’s, hence there’s two of them). The two little chips below them are the 74LS245 tri-state
8 bit computer, building the ALU
8 bit computer, building the ALU I’m in the process of building the Arithmetic and Logic Unit (ALU) for my 8 bit computer. So far, as you can see, the complete B register and half of the A register are
8 bit computer, clock circuit
8 bit computer, clock circuit The second print I made is the computer clock:
8 bit computer, program counter and reset
8 bit computer, program counter and reset I’m busy transitioning my 8 bit computer from the breadboards I built it on to experimental PCB’s. They will be on a bus print. Here’s the first video:
Display module
Display module Today I finished my display module. Using the EEPROM programmer I gave it three modes of display: Hexadecimal Decimal unsigned Decimal (two’s complement) See pictures: SaveSave
EEPROM Programmer
EEPROM Programmer For the more complex decoding on my 8 bit computer like for example the Control Unit I will use an EEPROM, not some elaborate complex circuitry. For this I must be able to program an EEPROM. On his Youtube channel
8bit computer status so far
8bit computer status so far Okay, I’d like to give you guys an overview of the status of the 8bit computer build. (Also see video at the bottom of this post). The Memory modules First of, here’s the clock and
Program Counter (PC) finished
Program Counter (PC) finished Today, I built the program counter (PC) for my 8 bit computer. It has three control signals: CE – Count Enable PCO – PC Out (put the contents of the PC on the bus) PCI – PC