Results tagged #Commodore 64 in Circuits
computer c64
A block diagram of the Commodore 64 internal power supply (how the +12V, +9V and TOD clock signals are generated from the 9V AC input). Take...
Expansion - C64 to 256kB
The inputs of the 74LS153 chip were mixed, which caused the address block decoding to fail. By now, I know of two Commodore 64 (mine and Pek...
Commodore 64 MOS6581 SID Based Synth / Sequencer
This is an old project of mine from about 3 years ago. I was 8 when my father bought me a C=64 28 years ago, and I still remember how thril...
Commodore 64 Keyboard Joystick & Paddle Interfaces
U1 is a Complex Interface Adapter (CIA). Both parallel ports are used to decode the keyswitches on the keyboard. Parallel port A signals (PA...
Commodore 64 Cassette Interface
U7 is a 6510 microprocessor. One of the features of the 6510 is a built in parallel I/O port (P0-P5). P3 - P5 control most of the cassette i...
Commodore 64 I/O ROM Expansion Port
The output F1 pin 17 of the PLA U17 goes "low" when the BASIC ROM is selected. The KERNAL ROM resides at locations $E000 - $FFFF. The output...
commodore 64c
All the mods were sourced through the Mssiah forum, so thanks to all for sharing. I`ve tried to credit all those responsible, and to help an...