vLA81

A ZX81 ULA replacement

from vRetro (Charlie Ingley)

price: 30 USD platforms: ZX81

Preserve your original ZX81 ULA or replace a broken one.

the vLA81 provides the functionality of both the earlier 2C158E/184 ULA (without back porch) and the 2C210E (with back porch) as well as a few extras.

It fits within the same 40 pin DIL socket outline as the original ULA, will fit straight into the existing socket if you have one.

Offers low power consumption, video level selectable between standard video and high sync level and back porch on/off. Optional external switch.

Find out more / buy at: https://www.vretrodesign.com/products/vla81-zx81-ula-replacement