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ram rom selector

ram rom selector
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
1 Stars     176 Views

Digital Combinational Circuits

Digital Combinational Circuits

Digital Combinational Circuits

Gates: NOT,  AND, OR, NAND, NOR, XOR, XNOR

half adder, full adder, multiplexer, demultiplexer



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logic gates 1

logic gates 1

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dld lab 3

dld lab 3

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0 Stars     74 Views
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fuller adder

fuller adder

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0 Stars     91 Views

LOGIC GATES

LOGIC GATES

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0 Stars     95 Views
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laws of logic gates

laws of logic gates

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1 Stars     133 Views
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All Gates

All Gates

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0 Stars     98 Views

dlf

dlf

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0 Stars     44 Views
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exp 7

exp 7
or

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0 Stars     70 Views

OR Gate 3

OR Gate 3

More complicated setup


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0 Stars     117 Views

Complex Gate 1

Complex Gate 1

Deep Dive 1


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0 Stars     102 Views
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tamrin5 Q1

tamrin5 Q1

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0 Stars     57 Views
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tamrin5 Q2

tamrin5 Q2

project.name
0 Stars     112 Views

Test1

Test1

Create Logic Gates and build Truth Tables


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0 Stars     118 Views

Complex Gate 2

Complex Gate 2

2.7 Complex Gates and Truth Tables


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0 Stars     80 Views

Complex Gate 3

Complex Gate 3

2.7 Complex gate with Truth Table


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0 Stars     113 Views

Complex Gate 4

Complex Gate 4

Complex Gates with Truth Tables


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0 Stars     126 Views

Complex Gate 5

Complex Gate 5

Complex Gates


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0 Stars     122 Views

test001

test001

test001


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0 Stars     110 Views

Test002

Test002

Test 002


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truth table of all gate

truth table of all gate

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0 Stars     73 Views
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Logis gates

Logis gates

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0 Stars     105 Views

Assignment 1

Assignment 1

Assignment 1 Lab 22-01-2020


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Basic Gates

Basic Gates

Simple Combinational Circuit using AND, OR, XOR, XNOR


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g=xy' +x'z' + x'y

g=xy' +x'z' + x'y

.


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h=(x'+y')(x+y+z')

h=(x'+y')(x+y+z')

.


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project4-1

project4-1

.


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0 Stars     95 Views
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COMPORTAS LÓGICAS

COMPORTAS LÓGICAS

Comportas lógicas anD/Ou, IFSP REGISTRO


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Experiment 1:Verifying truth table for gates

Experiment 1:Verifying truth table for gates

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E - TRÊS ENTRADAS

E - TRÊS ENTRADAS

3 ENTRADAS aND 


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OU - TRÊS ENTRADAS

OU - TRÊS ENTRADAS

OoR - TRÊS END


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COMPORTAS nOT, nOR, nAND E xOR

COMPORTAS nOT, nOR, nAND E xOR

AAAAA


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0 Stars     55 Views
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Verification of basic gates

Verification of basic gates

Verified the truth table of basic gates


project.name
0 Stars     63 Views
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trial

trial

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0 Stars     107 Views

Verification

Verification

project.name
0 Stars     99 Views

gates

gates

project.name
0 Stars     67 Views

logic gates

logic gates

project.name
0 Stars     79 Views

Study of logic gates

Study of logic gates

project.name
0 Stars     81 Views

logic gates

logic gates

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0 Stars     53 Views
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GATES

GATES

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basic circuit diagram

basic circuit diagram

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0 Stars     56 Views
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nor

nor

nothing


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0 Stars     49 Views

1st Project

1st Project

project.name
0 Stars     24 Views

01_basic gate

01_basic gate

project.name
0 Stars     52 Views

full adder

full adder

project.name
0 Stars     51 Views

3-bit carry look-ahead adder

3-bit carry look-ahead adder

project.name
0 Stars     74 Views

Exemplo de portas lógicas

Exemplo de portas lógicas

Exemplos do funcionamento das portas lógicas básicas.


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0 Stars     66 Views

assignment2

assignment2

project.name
0 Stars     32 Views

assignment2

assignment2

project.name
0 Stars     50 Views

assignment3

assignment3

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0 Stars     69 Views
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project.name
0 Stars     23 Views

Untitled

Untitled

project.name
0 Stars     48 Views

full wave

full wave

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full and half

full and half

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0 Stars     57 Views
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half

half

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0 Stars     55 Views
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full

full

project.name
0 Stars     52 Views
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multiplexer

multiplexer

project.name
0 Stars     19 Views
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DEMULTIPLEXER

DEMULTIPLEXER

project.name
0 Stars     15 Views

full

full

project.name
0 Stars     13 Views

demultiplexef

demultiplexef

project.name
0 Stars     54 Views

myGATES

myGATES

project.name
0 Stars     38 Views

EXPERIMENT 0 Basic gates

EXPERIMENT 0 Basic gates

project.name
0 Stars     60 Views
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logic gate

logic gate

logic gate project


project.name
0 Stars     62 Views

study of logic gates

study of logic gates

project.name
0 Stars     49 Views

Logic gates

Logic gates

project.name
0 Stars     70 Views

homework

homework

project.name
0 Stars     26 Views

Experiment1

Experiment1

first experiment


project.name
0 Stars     17 Views

rekha

rekha

project.name
1 Stars     179 Views
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This is a simple digital clock with basic combinational and sequential logic circuits.

It can display seconds, minutes, and hours

Users can set time by clicking the button and using the multiplexer to choose which to change.

Also, the design for the 4bits 7segment display and 3 bits 7segment display is inside.


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gheevas project 1

gheevas project 1

project.name
0 Stars     22 Views

experiment 1 level 1

experiment 1 level 1

project.name
0 Stars     9 Views

Unlovi gatetitled

Unlovi gatetitled

project.name
0 Stars     15 Views

Logic gate

Logic gate

project.name
0 Stars     19 Views

LOGIC GATES

LOGIC GATES

project.name
0 Stars     18 Views

7 gates Implementation

7 gates Implementation

First lab of COA. 

Implementation and verification of logic gates

1.AND gate

2.OR gate

3.NOT gate

4.XOR gate

5.XNOR gate

6.NAND gate 

7.NOR gate


project.name
1 Stars     16 Views

shubham kumar

shubham kumar

project.name
0 Stars     24 Views

shubham verma

shubham verma

project.name
0 Stars     13 Views

team baka

team baka

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0 Stars     17 Views
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Untitled

Untitled

NAND gate only version for other gates


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0 Stars     5 Views

teste

teste
or

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0 Stars     4 Views

BASIC GATES

BASIC GATES

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class project

class project

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two gate using not gate also class project

two gate using not gate also class project

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class project 3

class project 3