Partial tested midi interface.
Schematics based on https://groups.google.com/forum/#!topic/comp.sys.cbm/bPifzgUwfro
with 8k rom socket ($8000-9FFF).
To use rom, close JP1 and JP2
design partial tested
Rom found and running, midi detected by cynthcart v2.0
(note, running cynthcard V2.0 from 8k rom needs some crunching and relocation routine in rom as well)
Midi part not tested (I don't have midi...
Four Dot Matrix displays with Red/Green dots connected together. Data is sent for example from Commodore 64 (C64) and stored in shift registers which drive LEDs, meanwhile next line is loaded.
This design should be able to connect three boards together and fill at once with six data lines, and two clock lines. Therefore 8bit Commodore 64 is enough to handle it.
This is first version, REV 1.0, my f...
**WIP!** The circuit has been successfully tested on a breadboard, firmware exists. Will update here with all source codes when it's fully working.
This is my version of an USB SID adapter.
- plug in a original MOS8580 SID chip
- access it from the microcontroller
- interface with USB
The SID is directly connected to port B of the microcontroller, so one register write is sufficient. The DC boo...
This project contains the non-simulation schematic, BoM and PCB design for the EasyEDA Uberclamp Overvoltage Protection Circuit.
The attached photo shows the circuit clamping at the designed clamp voltage of 6V, a 3V/ms 5V to 9.5V transient. The trace starts on the left with both input (yellow) and output (magenta) traces at 5V. The input and output then ramp up together at about 3V/ms until t...
cinc is a recursive acronym for "cinc Is Not Commodore".
cinc is a Free Software project for creating a cheaper, completely usable, and modern 8-bit computer. It will be fully compatible with the Commodore 64 home computer, and it will be able to load the .d64 and .tap images using HTTP/S from the network. For this, it will include WIFI connectivity.
Please, find more information about this proj...
How to connect up two built and tested EasyEDA projects to build a complete replacement 5VDC and 9VAC power supply for the Commodore 64.
The design uses the EasyEDA Automotive 12V to USB 5V 2A output power adapter and Precision Commodore 64 Computer Saver PSU
overvoltage protection PCBs connected together with a 115V + 115V to 9V + 9V mains transformer, a pair of bridge
rectifiers, two 470...
This project contains several simulation schematics for the EasyEDA Uberclamp Overvoltage Protection Circuit.
It was originally conceived as a reverse input polarity protected, fast, self-resetting, current limited, overvoltage protector or Computer Saver for the Commodore C64 computer.
The original schematics were imported into EasyEDA from LTspice .asc files and have been edited to remov...