8965 Results for "8-bit cpu"

Reconsidering possible CPU options, and changing RAM setup.
Log from The Dingo Console
I have done some thinking, and realize that I don't have the required docs to interface an FPGA with a PIII correctly. So I had an idea: if I really can't use the PIII, I'll just save it for later and implement my own CPU on a separate FPGA, or I could...

Use in FPGA Microprocessor applications
Log from 8 Bit Computer Front Panel
The goal of this project is to use this design in a 8-bit Retro-Computer application. To meet this goal the 32 pushbutton and 32 LEDs need to be mapped to the CPU design. As an example of this mapping: Bottom row 8 LEDs are CPU D0-D7 (toggle pins)Next...

8-Channel Clock Generator Board Designed
Log from Anacon-xC
Got the clock generator board designed and ordered. This board is based on Silicon Labs Si5351A-B-GM, which can generate up to 8 independent channels of non-integer-related clock signals between 8 kHz and 160 MHz. They share a common clock domain too,...

BLWP, RTWP, Shifts and single bit I/O
Log from TMS9900 compatible CPU core in VHDL
Ok so more progress for today. I implemented many key (unique but a little obscure) features of the TMS9900. Still testing under simulation. I decided to postpone actual hardware synthesis until I have all the instructions somehow implemented. After...

More Schematic Work
Log from 8 Bit Breadboard CPU
Cleaned up the 16 bit register schematic quite a bit. Getting better with the upverter software.https://upverter.com/2-Zons/2bdc142f8f99588f/16-bit--Dual-8-Bit-register-with-Up--Down-/Implemented the fast carry in the ALU for the flag and at bit...

Instruction ST A, [addr] and research to 2nd gen CPU
Log from JACA 1 & 2 Homebrew Computer
Still lacks the ST A, [addr] instruction, to save the contents of tha A register to the RAM (actually, the register has only 4 bits and each RAM cell is 8-bit, so it uses just the 4 less significant bits, and the other bits are set to 0, kind of odd,...

w16 in .79s
Log from PEAC Pisano with End-Around Carry algorithm
The pthread-enabled parallel scanner is operational ! [yg@localhost pscan]$ gcc -Wall -Os -DWIDTH=16 -lpthread -D_REENTRANT -DTHREADS=4 pscan_04.c -o pscan [yg@localhost pscan]$ /usr/bin/time ./pscan Scanning w16 from X=1 (included) to 65536 (excluded)...

Meet the New Boss: Same as the Old Boss
Log from Kestrel Computer Project
I've decided to switch to a hardware sequenced microarchitecture for the Kestrel-3 CPU. It will be built just like the 6502 was: it will have a two-stage pipeline (fetch and execute), both operated under a single micro-sequencer, and the microarchitecture...

Picture on the screen!
Log from Poly94
This marks a major milestone of a working (-ish) framebuffer with software 3D rendering. It is slow to the extreme (the screenshot indicates 36 ms per frame, but this is actually 36 seconds as the poor 32-bit nanosecond-resolution timer had to be slowed...

ROM Bootloader: Bootstrapping protocol
Log from Reverse Engineering The Weather STAR 4000
Now that we were able to get some basic ROM routines working, setting up the 68K in an initial state and testing RAM, verifying that all of the hardware is operational, we can move onto writing yet another protocol for handshaking between the data...

On DIY
Log from Weird CPU
On DIYHaving successfully designed and built a reasonable complex project (a TTL computer) I would like to make some suggestions to those who are considering doing the same.If your a genius then you make your own rules and don't need to consider my learnings.The...

Adding RAM
Log from Big Daddy 68k
The last log entry showed a CPU connected to an Arduino, where the Arduino would act as both RAM and I/O, all running via a memory-mapped I/O interface. The address bus was completely connected to the Arduino's inputs. The software running on the microcontroller...

Miscellaneous instructions
Log from Instruction Set for ECM-16/TTL homebrew cpu
These are instructions that are more of service nature rather than close related to computation, and couldn't be classified together with them. All of these instructions take one word in memory. Instruction bits Mnemonic: F E D C B A 9 8 7 6 5...

Entry 29: A Little Bit of This, and a Little Bit of That...
Log from Aiie! - an embedded Apple //e emulator
As I've been writing in the last few updates: I've been working on support for the RA8875 display - so the next generation of the Aiie will have a display that can accommodate the 560 pixels wide that the Apple //e has in "double hi-res" modes (80-column...

testing the power
Log from GameBoy Zero, but smaller!!
i have had a little bit more of a play with the power meter. using the 'dank tombs' http://www.lexaloffle.com/bbs/?tid=28785 tech demo in pico-8 let me easily adjust the CPU load so i could get a better feel for the range of power usage, and it seems...

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