8965 Results for "8-bit cpu"

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...

Jelly as a HRM
Log from Jelly
Today, I discover about "Human Resource Machine", (https://tomorrowcorporation.com/humanresourcemachine) by https://github.com/adumont/hrm-cpu, https://github.com/nrkn/hrm-cpu and https://spectrum.ieee.org/three-computer-games-that-make-assembly-language-fun.The...

Contemplating 1-bit calculations, and challanges.
Log from 1 - bit ttl / cmos finite state machine
The Changes to the Instruction set: The MC14500 is primarily a 1-bit ICU. and thus, its not generally meant to do arithmetic (though it can through manual bit manipulation, it's not very fast.) Just as the UE14500 Project, our CPU will add...

Front Panel for 6800 CPU
Log from MIKBUG on Multicomp
8 Bit Computer Front Panel | Hackaday.io

CPU Board
Log from WDR-1-Bit-Computer
Last but not least, the CPU Board that holds the MC14500 ICU, together with a 8-Bit Input and 8-Bit Output IC. Instead of the MC14599 Input / Output chip, I use the MC14099BCP instead - or it's still available equivalent, the CD4099B, that is still sold...

16-bit Instructions
Log from Novasaur CP/M TTL Retrocomputer
The redesign continued to ECU section. The changes are fairly significant, so much so that the breadboard build needs to start over. It was almost back to the drawing board, but the CPU section remains fairly intact. The result is another reduction in...

State Machine and instruction types
Log from ECM-16/TTL homebrew computer
When I was coming up with new Register Transfer Scheme, and in general while rethinking the design approach for this CPU, I realised that the explicit state machine will be the way to go. At the time I thought it would consist of quite a few of...

A Demonstration Program for a One Bit CPU
Log from One Bit CPUs
A Demonstration Program for a One Bit CPU I was thinking about a suitable demonstration program for a one bit CPU. My design has 4 inputs, two memory bits and 5 outputs. Long time ago a friend had three 4PDT switches and two LEDs wired up to count the...

MISC Core Already Sports 8 Instructions
Log from Kestrel Computer Project
NOP, LIT8, LIT16, LIT32, SBM, SHM, SWM, and SDM are implemented.NOP is the no-operation opcode, of course.LITx loads an x-bit literal onto the data stack.SxM stores a byte, half-word, word, for double-word value to memory.In a mere five hours of hacking,...

First working CPU run!
Log from RC2016/99: TI-99/4A clone using TMS99105 CPU
Got the CPU working. The video is very lame (shot on my iPhone - unfortunately low res). But the point is, the TMS99105 actually runs and executes instructions! CPU external clock is still 20MHz, so machine cycle time is 200 ns (runs at 5MHz).There are...

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