1322 Results for "8-bit cpu"

UM245R - USB to 8 Bit Parallel Transceiver - How to use
Log from SPAM-1 - 8 Bit CPU
As one of the modules of my "TTL" CPU caled SPAM-1 I’ve been wiing up the UM245R serial to parallel UART from Future Tech Devices Inc FTDI. See datasheet :https://www.ftdichip.com/Support/Documents/DataSheets/Modules/DS_UM245R.pdf I’m using it...

G8PP+Z80, Part 4
Log from Generic 8-bit Processors Prototype (G8PP)
I like the idea of two separate boards, a common G8PP memory/IO/CF board, and a CPU board. I've designed 5 CPU boards with that concept in mind. These CPU boards have male RC2014 connector on one side and female RC2014 connector on the other...

CPU was synthesis passed!
Log from TMS9900 compatible CPU core in VHDL
I wrestled today with two of the remaining instructions, LDCR and STCR, but before explaining them, I did plug in the CPU to my EP994A project (TI-99/4A clone), basically replacing the external TMS99105 interface - and synthesis did pass!!!!!! Wow! I...

Free Run
Log from Wirewrap Pentium
It Lives! A good first step when starting a new homebrew computer is always the free run test — wire a simple repeatable instruction to the data bus (e.g. NOP), place pull resistors on all CPU inputs, and give it a good clock signal. The CPU will...

Finalized on Bus
Log from Zara80
I began laying out my modified RC2014 bus and I realized it has more problems than just missing signals. There's not termination, layout is not friendly to cross coupling concerns, etc. It's a great breakout for a z80 but it's a badly designed...

Kemitron 3000
Log from Kemitron Computer
I managed to find the specification of a Kemitron K3000E, in a PhD Thesis from Loughborough University, where a K3000 was in use in 1986. Processor: Z80A, 4MHz. RAM: 64K RAM. Storage: Dual 8” DS/DD Floppy Disk Drives. Interfaces: Expansion...

How Did Kestrel Receive its Name?
Log from Kestrel Computer Project
I get asked this a lot, so I figured I'd make a post on it.Back around 2001 to 2002 or so, long before I had even my first home-brew design working, some of my online friends and I were discussing making a computer built around the 65816 microprocessor,...

Next Steps
Log from Configurable video output for 6502 computers
I've been thinking about next steps for this project. It's been quite successful for its intended purpose, allowing me to experiment with different timings and resolutions. The 640x256 upgrade last week has been working well since then, and...

Time flies when you accomplish nothing of value.
Log from Kestrel Computer Project
Well, it's July, and the 4th RISC-V workshop is well underway. I could not attend as it conflicted with my planned vacation, but it is a constant reminder that I really, really wanted to have working hardware by at least November. I can honestly say,...

Thinking about a framebuffer...
Log from Discrete YASEP
I would LOVE to provide a decent video output to this system. However modern displays easily exceed the capacity of a 16-bits CPU.I don't want to limit the display to 320×200px like the mode13h in the ol'PC. I'd like 800×600 or even a decent...

Background Design Story Time
Log from Open Source Smart Display
So when I first started this project, the intent was to create a smart display which could be mounted to the wall, or even be propped on a kitchen counter or desk. The other thing I wanted as a feature for the project which makes this different...

Introducing COMET68k
Log from COMET68k
In The Beginning The story of COMET68k really starts back in July 2021. I had introduced a friend to the Motorola 68000 CPU and he was in the process of designing and building his first project using one of these processors. During the preceeding couple...

Decoupled Globules
Log from F-CPU
One design goal of the F-CPU is to increase efficiency with smart architecture features, and with the FC1 I would like to get closer to OOO performance with in-order cores. You can only go so far with all the techniques already deployed and explored...

Bye, Bye, I Guess I'll Use an R-Pi
Log from Radio-to-Internet Streamer
Summary: I did some quicky tests on a Raspberry Pi v1 Model B that I had lying around. With a modern kernel build with FPU support, it should work. Deets: Despondent over the recent findings with the Netduino Plus 2 board (that I would likely have...

Kestrel-3 Hardware Design Approach
Log from Kestrel Computer Project
Ideally, I'd like to synthesize the Kestrel-3 in an FPGA board with a price/performance tradeoff in the same ballpark as the venerable Digilent Nexys-2 board (no longer manufactured). However, contemporary FPGA development boards are either too simple,...

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