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Month: August 2017

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

Switching over to OS High Sierra immediately?

Switching over to OS High Sierra immediately?

Switching over to OS High Sierra immediately? Normally I would switch over to a new version of Apple’s Mac OS as soon as  it comes out. “It just works”, right? In the case of the upcoming switch to Mac OS

Gerard Wassink August 26, 2017August 26, 2017 General 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

Replacement soldering station

Replacement soldering station

Replacement soldering station My old faithful soldering iron died… It served me well during numerous years, but finally it gave up. It just does not produce heat anymore.   Soldering station So, time to select a new one. I decided

Gerard Wassink August 18, 2017August 18, 2017 Electronics, Makers 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

Debounce made visible

Debounce made visible

Debounce made visible The problem When using mechanical switches in electronic circuits we encounter the difficulty of what is called “bouncing”. A switch often contains a spring-like contact that, when pushed, bounces up and down sometimes and in doing so,

Gerard Wassink August 1, 2017August 1, 2017 Electronics, Makers Read more

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