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Tags: 8-bit

project.name
0 Stars     597 Views
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User Image Leonardo Miliani

ram rom selector

ram rom selector
and or 8-bit 74xx
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These are example circuits targeted to 8-bits homebrew computers. They are simple circuits to select between ROM and RAM memories when they share partial block of address space, i.e. if you have a big ROM chip, let's say 32K but you won't use it every single cell of it. So you can set a ROM and a RAM chip on the same address space and set your computer to select the proper one.
Let me explain. Let's say that you have 1x 32K ROM chip and 2x 32K RAM chips and you're using a Z80. The Z80 needs ROM on the first page of the address space because at reset it points to $0000 address cell. But your firmware only occupies 16/18 KB of space. So you can build this RAM/ROM selector using simple chips from the 74xx series and let the computer switches between the 2 kinds of memory. In the first one, for example, the CPU reads from ROM chip up to address $4FFF (20,479), then reads/writes from/RAM. In the second one, the CPU addresses the ROM for the first 24K of memory then switches to RAM
project.name
2 Stars     802 Views
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User Image simontiger

SAP-1

SAP-1
computer microprocessor 8-bit
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SAP-1 ("Simple As Possible")

A simple 8-bit processor. It has a simple instruction set:
  • LDA - 0 - Load RAM data into accumulator
  • ADD - 1 - Add RAM data to accumulator
  • SUB - 2 - Subtract RAM data from accumulator
  • OUT - e - Load accumulator data into output register
  • HLT - f - Stop processing
Credits to the book "Digital Computer Electronics" by Albert Paul Mauvino, where he invented the educational processor.
project.name
1 Stars     155 Views
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User Image Noor-E Sadman

DED for 8-bit data using Hamming code

DED for 8-bit data using Hamming code
8-bit Hamming Code DED
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DED for 8-bit data using Hamming code

project.name
0 Stars     300 Views
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User Image Barry Bogus

8B Addressable RAM

8B Addressable RAM
RAM 8-bit Memory Addressable 8 Bytes
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8 Bytes of addressable Memory. 3 Inputs top left are address, 8 inputs above flip-flops are data in, and button above data in is write. (Don't hurt me I'm new)

project.name
0 Stars     330 Views
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User Image CEa_TIde

8-bit computer simplified v2

8-bit computer simplified v2
computer CPU logic gates logic 8-bit
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A computer made completely out of logic gates. Version 2. V1 can be found here: https://circuitverse.org/users/13948/projects/49969

Because of the limitations of the circuitverse.org simulator, and for easier use, some inbuilt components are used (like the 256-byte RAM module), but most of it is made up of OR, AND, NOT, XOR, NOR and NAND.

This project was originally made for my profile project. This is (or will be) version 2 of the 8-bit computer.

project.name
3 Stars     215 Views
User:
User Image Christopher Gregory

SAP-1 v1.0

SAP-1 v1.0
computer sap-1 computer science 8 bit 8-bit CPU
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I finally did it.
I made my own 8-bit CPU! With a bit of inspiration from other CircuitVerse projects and from a book called, Digital Computer Electronics.
The premade program does this: 12 + 6 - 3 + 2 (which equals 17)

program the computer by typing in the opcodes in the ROM

Opcodes: (X = address)
0X = Load X's value to Accumulator
1X = Add X's value to Accumulator
2x = Subtract X's value from Accumulator
ee = Take Accumulator's value and put it in the Output
ff = Halt/stop everything

Versions (Date format: DD/MM)
9/11 v1.0 - Finally finished it!

project.name
0 Stars     69 Views
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User Image Ítalo

8-bit Adder

8-bit Adder
8-bit Adder
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project.name
0 Stars     143 Views
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User Image bald_master

POLY8

POLY8
CPU calculus 8-bit processor RAM ROM
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An 8-bit CPU with an instruction set that includes the analytic integration and differentiation of polynomial expressions.

project.name
0 Stars     52 Views
User:
User Image Peter Lichtenstein

7-Bit BRWD

7-Bit BRWD
8-bit 1-byte Reader Writer RAM 7-bit
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BRWD: BINARY READER AND WRITER DEVICE

Specs:

7-bit RAM

8-bit Memory

How to use:

1. To start writing, set your clock speed, and turn on the "Writer" switch.

2. To scroll through the memory, turn on the "Scroll" switch. Press "Reset" if you are ready to read.

3. Turn the "Writer" switch off, and turn on "Scroll" to start reading the binary.

4. Then when you're done, press "Reset RAM" to reset your writing.

project.name
0 Stars     41 Views
User:
User Image Gábor Iványi

8-bit Microcomputer v1.9

8-bit Microcomputer v1.9
CPU 8-bit microcomputer
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Under construction.

project.name
0 Stars     32 Views
User:
User Image Gábor Iványi

8-bit Microcomputer v1.5

8-bit Microcomputer v1.5
8-bit CPU Microcomputer
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Under construction.

project.name
0 Stars     110 Views
User:
User Image Gábor Iványi

8-bit Microcomputer v2.0

8-bit Microcomputer v2.0
CPU 8-bit microcomputer
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Under construction.

project.name
0 Stars     9 Views
User:
User Image Ricardo Nieblas Cabrera

Arquitectura Organizacional

Arquitectura Organizacional
8-bit
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project.name
0 Stars     6 Views
User:
User Image Andrew Lobley

Literally a whole computer

Literally a whole computer
computer 8 bit 8-bit learning computation assembly
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Creating an entire functional and custom 8-bit computer from scratch with assembly language support (not yet complete)

project.name
1 Stars     1 Views
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User Image Forge Dragon

Add/Subrtract

Add/Subrtract
Adder Subtractor ALU 4-bit 8-bit
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Features a single-bit adder and subtractor as well as a combination of the two. Also showcases a 4-bit adder/subtractor and an 8-bit ALU adder subtractor.


(If anything in the description is wrong please feel free to say so in the comments.

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