10544 Results for "8-bit cpu"

8 bit CPU desing progress
Log from JACA 1 & 2 Homebrew Computer
Great progress today, some instructions already working on Logisim (check it out the files on github).But...I figured out that for this design to work, there will be necessary two 3-state output drivers (sixteen gates) in the out of each register (and...

Entry 8: a Teensy bit of support
Log from Aiie! - an embedded Apple //e emulator
(This post refers to git commit 3af0b916d7481305979181e1c307ef40e1b46f19.)Finally! Here's the important part: all of the hardware model for the Teensy. Well, most of it. There's something I haven't put in quite yet that I'll get to in the next log. :)This...

4-bit TTL ALU
Log from One Transistor FlipFlop
If you are interested in flipflops, building CPU's might also be of interest to you.... I started a new project, a 4 bit TTL ALU with only 7 TTL IC's. It fits on a 1 x 1 inch PCB.....And the next project is a TTL CPU on one square inch...

8-bit Microcontroller Hack Chat Transcript
Log from 8-bit Microcontroller Hack Chat
Garrett Scott I'm Garrett Scott, technical marketing engineer at Microchip Technolog, specifically in the 8-bit divisionYann Guidon / YGDES technical marketing engineer : is that technical, marketing, or engineering ?....Kevin @Yann Guidon / YGDES They...

Cambridge-1 4-bit CPU: microSD and I/O upgrades
Log from Cambridge-1: a 4-bit 7400 series based CPU
The Cambridge-1 has got some upgrades! Check out the latest video below:

4-bit cpu schematics 1.2
Log from The simplest 4-bit RISC CPU
I realized that the flip-flop chip 74LS173 is obsolete and no longer available.Replaced the obsolete 74LS173 with other TTL flip-flop 74LS175.Added jumper and switch for manual step clock operation,Added 5v voltage regulator and bypass capacitors.The...

General bit layout for instruction types
Log from Instruction Set for ECM-16/TTL homebrew cpu
All instructions are 16-bit wide (1 word), with optional extension of 16 more bits for immediate value needed for some of these instructions. Bit patterns for the instruction types: bits in instruction word: FEDC BA98 7654 3210 [extension]...

Almost done (on circuit simulator)
Log from JACA 1 & 2 Homebrew Computer
8 bit CPU with almost all instructions working fine, ALU implemented (2x 74181).Just 2 or 3 instructions more and it will be completed.Meanwhile the parts for the real CPU on breadboards are ordered, just waiting for delivery (rarely under 45 days in...

The Laughton Electronics One Bit Machine
Log from One Bit CPUs
The Laughton Electronics One Bit Machine The Laughton Electronics one bit machine is very likely the smallest discrete CPU that can be built (http://laughtonelectronics.com/Arcana/One-bit%20computer/One-bit%20computer.html): I have designed a simplified...

Adding 16 bit ISA support
Log from Beckman DU 600 Reverse Engineering
Today I will be adding 4 project logs, 3 of which are a bit overdue.For the first, sometime back in June of last year, I began to look into the simple ISA implementation used to interface the Cirrus Logic CL-GD5429 SVGA chip to the 68332. My intention...

TD4B CPU Schematic and Simulating a TTA CPU
Log from TD4 CPU
TD4 CPU Version B Here id the full schematic And the PCB: Simulating A TTA A TTA is a Transport Triggered Architecture (i.e. a single instruction move only CPU). An example is my Weird CPU. Why simulate TTA? It is a good test for a CPU, can it...

Reverse Engineering Motor Signal Board Day 8 - Finally figured out the clock!
Log from Reviving and Reverse Engineering an Old Robot Arm
I finally figured out the clock that is running to all of the flip flops! There is a 2MHz clock signal coming from the main CPU board that goes into a 4 bit counter, and the flip flop clock is using the uppermost bit so it is effectively divided...

OPC-5 - the (16 bit) journey begins
Log from OPC-5 - a CPU for FPGA, in one page
We were last seen with the OPC-3 - a one-page computer with 16 bit data, 16 bit addresses, and 16 valid opcodes, as a hastily-inflated version of OPC-1, our CPU for CPLD. It felt good to have 16 bit words - lots of room in the instructions, and fitting...

Robby compiler for Voja's 4-bit processor?
Log from nedoPC SDK
Since new Supercon badge was introduced I started thinking about possible porting of my Robby compiler (aka nedoPC SDK) to this 4-bit processor - it should be doable. Robby is a programming language that operates only 16-bit signed integers. I can write...

PCB's ordered
Log from Kobold K2 - RISC TTL Computer
Two PCB's are designed now:The CPUA mainboard for the CPUThe video part is not designed yet. The mainboard has a 96 pin connector (same as CPU) where the video PCB can be placed once it is ready.Here comes the CPU impression from the PCB makers website:And...

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