eater-sap-1-improvements
Improvements and modifications made to the Ben Eater SAP-1 breadboard computer (by michaelkamprath)
8-bit-computer
Documentation of my 8-bit computer build (by blurpy)
eater-sap-1-improvements | 8-bit-computer | |
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14 | 22 | |
46 | 19 | |
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2.7 | 0.0 | |
8 months ago | almost 3 years ago | |
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Creative Commons Zero v1.0 Universal | - |
The number of mentions indicates the total number of mentions that we've tracked plus the number of user suggested alternatives.
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Activity is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.
For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.
Stars - the number of stars that a project has on GitHub. Growth - month over month growth in stars.
Activity is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.
For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.
eater-sap-1-improvements
Posts with mentions or reviews of eater-sap-1-improvements.
We have used some of these posts to build our list of alternatives
and similar projects. The last one was on 2022-06-04.
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Next project for my PUTEY-1 TTL CPU: A speech synthesizer!
When I figure out why the "voice" is unintelligible, I will be certainly posting all the details and making a video as I have done with my prior projects for this computer. Subscribe to my YouTube or follow my GitHub repository to get alerts.
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It took about a week, but my PUTEY-1 TTL CPU has calculated all the prime numbers to about 1.1 million.
The details of my design evolution from the Eater SAP-1 to what you see here are documented at my GitHub repository. You can also watch video overviews if each improvement project at my YouTube channel, the I haven’t yet made the video for the ALU that’s enabling multiplication and division through bit shifting. That’s only at my GitHub at the moment.
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My TTL CPU is now operating at 300 KHz clock and can calculate 32 bit prime numbers.
Ha ... yeah, it was overkill, but the 32K was just sitting there unused. If you check out my code for the prime number calculation, you'll see the stack is well used. However, I haven't cracked the 256 byte depth yet.
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has anyone programmed an EPLD?
I am using the ATF22V10C in my build. Works great. I’ve made some notes on programming them here: https://github.com/michaelkamprath/eater-sap-1-improvements/tree/advanced-alu/advanced-alu/pld-files
- I’ve built out my ALU upgrade for my TTL CPU. I use 74LS382 function generators, 74LS194 bit shifters, and 74LS682 comparators to significantly upgrade what can be computed from the original 74LS283 4-bit adders.
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8-bit CPU project upgrading
I’ve done a number of upgrades myself. They are documented here: https://github.com/michaelkamprath/eater-sap-1-improvements
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Stuck with strange voltage behavior in RAM module that goes away when using a multimeter
Here's the write button. https://i.imgur.com/N3WgqR9.jpg I've inverted it from a pull-up switch to GND, to a pull-down switch to VCC, using Michael Kamprath's improvement recommendations found at https://github.com/michaelkamprath/eater-sap-1-improvements/tree/main/improving-reliability-of-ram-module
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The next iteration of my extend breadboard TTL CPU is working. Time to finish project documentation and create an overview video.
This iteration on the CPU focused on implementing a 8-bit instruction register. However, doing this required me to rethink many parts of the computer, notably the memory map and the control logic. Details on what I accomplished in this project can be found in my GitHub repository: https://github.com/michaelkamprath/eater-sap-1-improvements/tree/main/instruction-register-8-bit
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My updated 16 bit memory + updated control logic + memory map controller + 8 bit instruction register is ready to be integrated into my breadboard CPU.
If you want to read up on what I am doing here before I create a video on it, I have documented everything here (though there are a few bits I still need to document).
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The start of my effort to add 16-bit memory addressing to my SAP-1. Built so far at 16-bit program counter, memory address register, and run mode selector. The design now has a proper address bus (purple wires) in addition to the 8-bit data bus.
You can check out the current state of my design on my ram-upgrade branch in my GitHub repository. It's still a work in progress, so don't yet expect the same level of documentation or completeness my other modules have.
8-bit-computer
Posts with mentions or reviews of 8-bit-computer.
We have used some of these posts to build our list of alternatives
and similar projects. The last one was on 2022-02-16.
- My RAM is having this issue where switching between program and run mode automatically changes the contents. How do I fix this?
- I finished the Ben Eater 8 bit computer project (took 8 months) What a journey. Couldn't have gotten it working without all the info from reddit. Amazing community and project <3
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Loading programs into the 8-bit-computer with just an Arduino Nano
Here's a nice collection of programs i found: https://github.com/blurpy/8-bit-computer/tree/master/programs (thanks, u/blurpy1 !)
- Any suggestions why my register isn’t registering?
- Having an issue with register
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74ls00 inverter why is it getting 5v all the time on pin 1? feels like my RI Isnt working right... i removed the cap.. fyi
https://github.com/blurpy/8-bit-computer/blob/master/issues.md kinda explained but i didnt exactly follow it the way they solved it, kinda did my own thing
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Why does the data keep changing when i go between run and prog...
Hello! This could linked to bouncing noise on the memory write line caused by the switch as it transitions from one state to the other. The 104 cap solution described in the 'RAM mode switch changes memory content' section of this post might work for you.
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Ben eater inspired 8 BIT CPU ( it took just 2 months to complete from scratch )
follow this git repo for more solutions to common problems https://github.com/blurpy/8-bit-computer/blob/master/issues.md
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Ram module issue
Hello! There is a known memory corruption issue with the run/prog switch when it transitions. Take a peek at the "RAM mode switch changes memory content" section of this post. The solution in there may work for you.
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Over 150 feet of wire. No joke.
Hello! Had the same exact same issue. Turned out to be a spike on the reset line when there were a lot of state transitions on the bus. Putting a cap on the reset pin of the A register, as explained in the 'A Register Resetting' section of this post did it for me. Might be worth trying.
What are some alternatives?
When comparing eater-sap-1-improvements and 8-bit-computer you can also consider the following projects:
kicad_footprints - A collection of all the KiCad footprints on the internet
The-8-bit-SAP-3 - Documentation and source files for a SAP-3 breadboard Computer
8bit-cpu - Schematics & code for my 74LS-based 8-bit MK1 CPU
modular-breadboard-base - Breadboard base with attachment slots for various modules
skidl - SKiDL is a module that extends Python with the ability to design electronic circuits.
8-bit-computer-emulator - Emulator of my 8-bit-computer
bespokeasm - An assembler that works with custom instruction sets.
EaterEmulator - Ben Eater's 8-bit breadboard computer emulator in python
TinyE8 - Ben Eater's 8 bit breadboard computer emulator in C++
eater-sap-1-improvements vs kicad_footprints
8-bit-computer vs The-8-bit-SAP-3
eater-sap-1-improvements vs 8bit-cpu
8-bit-computer vs modular-breadboard-base
eater-sap-1-improvements vs skidl
8-bit-computer vs 8-bit-computer-emulator
eater-sap-1-improvements vs bespokeasm
8-bit-computer vs EaterEmulator
eater-sap-1-improvements vs EaterEmulator
8-bit-computer vs TinyE8