8 bit computer, buildup status
8 bit computer, buildup status
The status so far in pictures:
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Category: Education
8 bit computer, Output Module complete
8 bit computer, Output Module complete
Today I finished building and testing the Output Module for my 8 bit computer. See video and picture below.
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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, the clock pulse was very messy, but adding a 100nF… Read the rest
Share 2014, keynote by Wim Veen
Share 2014, keynote by Wim Veen
A magnificent video about modern learning. Worth to spend some time on!… Read the rest
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 buffer, that connects it to the bus in a controlled… Read the rest
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 built. In the open space in the middle the ALU… Read the rest
8 bit computer, clock circuit
8 bit computer, clock circuit
The second print I made is the computer clock:
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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:
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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… Read the rest
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 Ben Eater describes one based on an Arduino… Read the rest
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 the memory. I already described the clock module, the memory… Read the rest
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 In (Read the contents of the bus and store… Read the rest
Digital oscilloscope
Digital oscilloscope
Yesterday I got me a digital oscilloscope, the Velleman WFS210. It doesn’t look like much when you see it here on the right, but it stacks a nice amount of features.
First of all, it works via Wifi. It creates it’s own wifi network and is its own… Read the rest
Memory, registers and ALU
Memory, registers and ALU
For my 8 bit computer I built the A and B registers and the Arithmetic Logic Unit (the ALU). Also I’m experimenting to create 256 bytes of memory.
Status
The registers now work, they can put values on and accept values from the bus. The ALU… Read the rest
Explanation of network protocols
Explanation of network protocols
Toady I ran into a series of video’s with a very good explanation on how networks and network protocols work, how they fit together and how they take care of transporting your data from A to B.… Read the rest