Have you ever wondered what it would be like to build a computer from scratch, and make it work the way you want? Before personal computers such as the Commodore PET or the Apple 2 became available in the late s, the only way for an individual to own a computer was to build one yourself. And every self-built computer could be unique, customized to the wishes and interests of the person who built it. The ability to build a computer from scratch, and having a deep understanding of how it works, is arguably a lost art nowadays.

The Propeddle tries to change this. It is an open-source electronic kit, available soon from tindie. It only uses through-hole components no SMD so it should be easy to solder together even for those who have limited soldering experience.

You can also purchase it pre-assembled for a small extra charge.

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A Parallax Propeller generates the clock and other signals needed by theand it also controls the memory chip. Bill Mensch will be honored in a future product. In addition to the Propeddle kit, you will also need the following more details will be provided later :. More information will appear on this website and on the Propeddle Google Plus account. Before the Propeddle website existed, I wrote a lot of information in the SavageCircuits forums; those posts are available on the Zappbots website now.

Skip to content. Propeddle — Software Defined Computer Kit Have you ever wondered what it would be like to build a computer from scratch, and make it work the way you want?

All the parts that are needed for a Propeddle Rev. Except there is no Rev. Thanks for sharing, Dennis! Comments are closed. So the question "Is it possible to bit-bang a processor with a Propeller to make it work at 1MHThe is the famous processor found at the core of such influential computer systems as the Apple ][, the Commodore PET, the Atari and home video game consoles, the BBC Micro, and the Tamagotchi digital pet.

Slight variations of it were found in the Commodore 64, the Atariand the original Nintendo Entertainment System.

The MOnSter 6502

What's with the name and capitalization? MOnSter is a play on the original manufacturer and device name MOS as well as acknowledging its large size.

diy 6502 computer kit

How big is it? How many components are there on the board? In total, there are components on the board. There are transistors and resistors that comprise the "functional" part of the In addition to these, there are also LEDs sprinkled throughout that indicate the values of various control lines, registers, and status bits, as well as additional transistors and resistors not counted in those "functional" totals that are necessary to drive those LEDs.

As of the second revision of the board, the design statistics are as follows: Components that correspond with transistors in the original Total active transistors: enhancement mode n-channel MOSFETs discrete located on quad transistor array chips 26 of these transistors are not used resistors the original used depletion mode MOSFETs in place of resistors Additional parts present only in the MOnSter LEDs The first revision board, shown in the video, has only LEDs extra MOSFETs for driving the LEDs 20 filter capacitors 32 bus capacitors 2 zero-ohm jumpers for net tie reasons 8 current limit resistors resistors for the LEDs 36 diodes for ESD protection 2 jacks for 5 V power: main and alternate location 1 rectangular connector for the pin "ICR" ribbon cable Total parts: Are you nuts?

What is the current status of the project? Headed towards a full public launch, early ! The first full-scale prototype was publicly demonstrated at the Bay Area Maker Faire. Our second prototype, a year later, fixed a few issues that we encountered when bringing up the first version removing all of the patch wires but also added over additional LEDs, including one for every instruction decode line on the 's decode ROM.

Since the is just a microprocessor CPUabout half of our work on the project and most of our work since the first prototype has actually been building up the capabilities around this processor — adding interfaces for a keyboard, monitorand programming — so that you can actually use it.

In the process of doing so, we have built up a single-board computer a tiny motherboard that uses the as its CPU, such that you can either use a socketed vintage IC, or the MOnSter through a cable. More, we have been working towards a public launch, building the MOnSter into a shadowbox enclosure complete with a tiny hidden "motherboard" that the CPU sits in, so that it can run demonstration programs even without being plugged into a separate computer. Does it run at the full speed of an original chip?

No; it's relatively slow. The maximum reliable clock rate is around 50 kHz. Can you hook it up inside an Apple ][ and run Oregon Trail? No, not directly. The Apple ][ design relies on a number of clever tricks that derive timing for video generation and peripheral control from the main clock signal — all of which will fail if you need to run at a slower speed.

There are some ways to get around limitations like these. For example, the Replica I computer an Apple I clone uses a Parallax Propeller chip to emulate a system clock and some of the timing-dependent external processing. The RetroShield is another example of a software-implemented Apple I compatible that can use a hardware processor. We are most excited about the forthcoming SmartyKit Apple I replicawhich is specifically designed to run at a slower clock speed. So what can it do?

It can act as an in-circuit hardware emulator for a integrated circuit, in any circuit that can run at a relatively low clock rate. We're currently running it on a custom development board the single-board computer that we mentioned earlier and doing things like running running BASIC, much as you would on an Apple ][.

We have also plugged it into the CPU sockets of a few people's homebrew computers including the Cactus and RetroShield that could run at variable clock speed. We are interested in finding other applications where it could be substituted for an original How long did it take?

Welcome to the Gigatron!

The primary design work was done over six months, from July 3 to December 1 There have been several stages of reviews and revisions since then.Wichit Sirichote, wichit.

Build a single board microcomputer with CPU. Simple design and cheap, everyone can build it. Updated monitor is available for download now! But here in Thailand, Z80 is very popular. Many single boards computer use Z80 as a CPU.

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Colleges and university also teach basic microprocessor with Z I got two chips of CPU two years ago. At the yearend of32 years since I was a student, I picked the CPU and designed the microcomputer kit again with HEX key and 7-segment display. I wrote the monitor program using instructions. I used TASM assembler. My intention is to design the microcomputer board that uses as a CPU. The kit is suitable for today student to learn many addressing modes and hardware of the CPU.

The circuit is simple and easy build. A simplified block diagram of the Microprocessor kit is shown in Figure 2. The oscillator is 1MHz. The display for address and data is 6-digit 7-segment LED. Input device is hex keypad. The extra circuit, Hz tick generator is for experimenting with time trigger programming. U2 is 32kB static RAM, Zero page is located at 0xx00FF and the stack memory at 0xx01FF.

User program can be tested from address 0x U6 is shift register used for single instruction execution. SYNC pulse that indicates instruction fetch cycle will shift the logic high from input pin at the 8th instructions. User instruction will be executed once and NMI will be serviced. U3, the pin 89C microcontroller chip produces 10ms tick. SW1 selects between 10ms tick or manual IRQ button. Six bits, PA0-PA5 are input signals of the row keypad. PA6 is user key for repeat function.

The 8-bit output drives the 7-segment LED directly. No current limit resistor.

diy 6502 computer kit

U12 PORT1 drives 6-digit common cathode pin. The brightness is controlled by PWM. PC6 controls single step operation. U14, 74HC is 8-bit output port for 8-bit binary number display. D13 lifts the forward biasing for proper brightness. J11 is pin socket for text LCD interface. The source file of PLD equations is shown in Figure 4.We all have to start somewhere. When building a computer, there are many pieces that have to come together and work before anything happens.

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Anything at all. This could be frustrating. If one of these basic elements is faulty then how do you go about finding which one? I need something much simpler than that. Even the name is somehow redolent of the early s.

Be warned, though, that its availability seems somewhat sporadic. I went for the version with the optional LCD screen and keyboard connector.

The kit comes with everything you need to build a functioning computer on a breadboard, including the breadboard itself. I could almost certainly have bought the components for a lot less than I paid for the kit, but what attracted me most were the manuals.

The main manual walks you through all of the theory and concepts behind the computer design.

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It was the book that demystified the concept of hardware addressing for me. And you have to admit that the graphics and ring-binding do beautifully evoke the era of 8-bit microcomputers. This is also highly instructional — for example, your first step is creating a reset circuit that puts the processor into the right power-on state.

The manuals provide a valuable course in basic computer design. And that will be right before I break it. I plan to put a lot more memory into ROM. And I also want to move beyond that small LCD screen. Your email address will not be published. Notify me of new posts by email. This site uses Akismet to reduce spam. Learn how your comment data is processed. This is how I plan to proceed with the Zolatron 64 — take a working micro and then hack it.

The full kit as it arrives. Computing with arthritis — keyboards, mice and more. Leave a Reply Cancel reply Your email address will not be published.

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Sorry, your blog cannot share posts by email.The Gigatron TTL microcomputer is a minimalistic retro computer. These chips combined form a powerful 8-bit processor. By eliminating these the hardware remains small and understandable. Still the single-board system works as a full-blown microcomputer that you can play video games with.

Now you can easily build one yourself. As you build, learn what happens inside a CPU by looking inside one. See the functional units, look inside the Arithmetic and Logic Unit, see its truth tables and learn what makes up a ROM. You can also hack it in any way you like if you have a taste for that. We have given in-depth talks at several hacker spaces.

Here is one Walter did at Hackerhotel explaining both concept choices and design details. For a PDF version of the slides and for more materials, check out the Tutorials section. For general questions, feel free to drop us an e-mail. Recently we passed a milestone that far surpasses our stretch goals. Now, a little over one year later, more than Gigatron kits …. The Apple-1 next to the Gigatron is a beautifully done ….

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Skip to content. Welcome to the Gigatron! Gigatron is a TTL microcomputer that you build yourself. What you need is the following: The kit, containing the printed circuit board, all the electronic parts, a retro game controller, a full-color assembly manual also containing schematics and a soldering course and the shiny, mahogany colored, wooden case with plexiglass viewing window; A soldering iron, solder and a multimeter; Side cutters and optionally but handy some needle-nose pliers; Something that provides USB power laptop, USB charger.

How it works We have given in-depth talks at several hacker spaces. Duration: 52m22s For a PDF version of the slides and for more materials, check out the Tutorials section. Duration: 40m For general questions, feel free to drop us an e-mail.Home design based breadboard computer BBC! Not a member? You should Sign Up.

6502 computer build, part 1

Already have an account? Log In. To make the experience fit your profile, pick a username and tell us what interests you. We found and based on your interests. Choose more interests. The clock circuit of my project used a I also have a 5. This led me to believe that my RAM was not fast enough to keep up with the demand at 5. I also made some software adjustments, mainly putting in extra NOP instructions to delay the speed at which the TMS was being driven and the BBC keyboard was being strobed.

To cut a long story short, it turns out that the 15ns chip is glitchy, but the 70ns chip works fine once the software reflects the faster CPU cycles. I also got a huge amount of insight from the expert folks over at the forum - turns out my assumptions on the activities of the across one clock cycle are incorrect, but still my current design does work without any issues - but it's not optimal and I will sort this out in due course. So I'm mega pleased. I would never have dreamt of a 5.

My machine is more than 2. Adobe Portable Document Format - View all 10 components. I have decided to start a new log dedicated to dflat, the programming language I have built. I'll tidy up the other logs for duplication, but here will be detailed information and demos to show the capabilities. I had an initial video of a demo space invaders type game on youtube but decided to replace it with something more extensive and some commentary which I hope helps.

This is basically a complete game, takes up around bytes of source code which is tokenised to around bytes in memory. It's extremely rudimentary, but about the quality of type in games found in magazines of the early 80s, so I'm not too embarrassed by the effort. During the programming of this game, I had some strange things occur which I traced back to a couple of serious bugs in dflat around the saving of state when calling a procedure - luckily not too difficult to fix.Have you ever wondered what it would be like to build a computer from scratch, and make it work the way you want?

Before personal computers such as the Commodore PET or the Apple 2 became available in the late s, the only way for an individual to own a computer was to build one yourself.

And every self-built computer could be unique, customized to the wishes and interests of the person who built it. The ability to build a computer from scratch, and having a deep understanding of how it works, is arguably a lost art nowadays. The Propeddle tries to change this.

diy 6502 computer kit

It is an open-source electronic kit, available soon from tindie. It only uses through-hole components no SMD so it should be easy to solder together even for those who have limited soldering experience. You can also purchase it pre-assembled for a small extra charge.

A Parallax Propeller generates the clock and other signals needed by theand it also controls the memory chip. Bill Mensch will be honored in a future product. In addition to the Propeddle kit, you will also need the following more details will be provided later :.

More information will appear on this website and on the Propeddle Google Plus account. Before the Propeddle website existed, I wrote a lot of information in the SavageCircuits forums; those posts are available on the Zappbots website now. Skip to content. Propeddle — Software Defined Computer Kit Have you ever wondered what it would be like to build a computer from scratch, and make it work the way you want?

All the parts that are needed for a Propeddle Rev. Except there is no Rev. Thanks for sharing, Dennis! Comments are closed. As I mentioned before, I've been working on a version of the Propeddle kit that has everything inclu Propeddle is single-board computer, based on the microprocessor.

It's not an emulator and it's


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