Tag: timing

Replaces the 74LS08 clock logic in Atari XL and XE computers with four separately buffered O2 outputs.

The product exposed a login-or-register-to-buy path on 2026-07-27. Installation replaces a 74LS08; a non-socketed chip must be desoldered and the required 14-pin socket is not supplied. The installer must identify the motherboard's actual CPU O2 connection by continuity rather than relying blindly on a model example. Three outputs carry 680 pF capacitors, while the uncapped top output is intended for Ultimate 1MB; remove a corresponding capacitor if a capped output causes instability.

Generates three independently selected clock outputs for RCBus processor and peripheral timing.

The project provides a schematic, Gerbers, PCB design files, and kit or bare-PCB suppliers; an assembled version is not offered. Check every destination jumper to avoid driving a bus clock signal from more than one source.