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8 bit computer, test the Output Module

8 bit computer, test the Output Module

8 bit computer, test the Output Module Today I hooked up my Output module – still on breadboard – to the signals from the PCB modules. As you can see in the video below, it works so far. At first,

Gerard Wassink September 9, 2017 Computer organization, Construction, Education, Makers, System fundamentals Read more

16 position rotary switch for hex input

16 position rotary switch for hex input

16 position rotary switch for hex input Found this post for a better input possibility:  

Gerard Wassink August 27, 2017August 30, 2017 Computer organization, Electronics, Makers Read more

8 bit computer, ALU complete

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

Gerard Wassink August 27, 2017August 27, 2017 Computer organization, Electronics, Makers, System fundamentals Read more

8 bit computer, building up the ALU

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

Gerard Wassink August 20, 2017August 21, 2017 Computer organization, Education, Electronics, Makers, System fundamentals Read more

8 bit computer, building the ALU

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

Gerard Wassink August 19, 2017 Computer organization, Construction, Education, Makers, System fundamentals Read more

8 bit computer, clock circuit

8 bit computer, clock circuit

8 bit computer, clock circuit The second print I made is the computer clock:  

Gerard Wassink August 13, 2017August 13, 2017 Computer organization, Education, Electronics, Makers, System fundamentals Read more

8 bit computer, program counter and reset

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:  

Gerard Wassink August 12, 2017August 13, 2017 Computer organization, Control, Education, Electronics, Makers, System fundamentals Read more

Display module

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

Gerard Wassink June 18, 2017June 19, 2017 Computer organization, Education, Makers, System fundamentals Read more

EEPROM Programmer

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

Gerard Wassink June 14, 2017June 19, 2017 Computer organization, Control, Education, Electronics, Makers, System fundamentals Read more

8bit computer status so far

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

Gerard Wassink June 11, 2017June 11, 2017 Computer organization, Education, Makers, System fundamentals Read more
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