[Stargate SG-1] Why doesn't the SGC upgrade the dialling computers?

When we’re introduced to the Stargate, it’s in the early-mid 90s, so them needing a big, bulky computer system would make sense, but as the show progresses, we see Tau’ri computer technology develop, either conventionally in the form of laptops like what the Atlantis team use, or computer crystals like what they fitted...