Tag: timer

Adds a battery-backed DS3231 clock, external LED time display, date display, and timer to a Commodore 64.

The Tindie page listed Clockwork64 at USD 38 but had ordering paused while the seller takes a break through July 31, 2026. It calls this the final batch before retirement, so confirm that an order can still be placed after the seller returns. A CR2032 is included. The maker reports compatibility problems with modern J-CIA replacement chips and directs buyers to version 0.2 of Timo Voutilainen's RTC software.

Adds four programmable counter and timer channels with frequency and interrupt generation.

The project supplies a schematic, Gerbers, PCB design files, and kit or bare-PCB paths. The optional onboard oscillator is not included in the kit. Mode 2 interrupt chaining needs suitable backplane support or flying leads.

Combines two Z80 SIO/2 serial ports with four programmable Z80 CTC channels.

The project supplies a schematic, Gerbers, PCB design files, and kit or bare-PCB paths. The optional oscillator is not included in the kit. Standard RomWBW does not enable CTC support, so its documented jumper setup bypasses the CTC and assumes a 7.3728 MHz CPU clock.

Adds a software-enabled 50 Hz system tick interrupt.

The project supplies a schematic, Gerbers, PCB design files, and kit or bare-PCB paths. Interrupt generation is disabled at reset. A jumper routes the signal to /INT, /INT1, or /INT2 where the chosen bus exposes it.