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Back to forum See the full topic Go to last reply Posted By weidi on 2021-12-17 11:14:35  Re: Cartridge port Not working correctly Ups i forgot: to test U20, U21, U22 - ROM banking circuit, you can try to use 3-in-1 software build in Plus/4. Back to top Copyright © Plus/4 World Team, 2001-2024. Support Plus/4 World on Patreon