Smokeless Joe Posted June 17, 2022 Share Posted June 17, 2022 I just got a sweet TRS-80 Model 1, but it has Level I BASIC, so it's not compatible with the MIRE and MISE I already have. What's the recommended way to upgrade the Model 1 from Level I to Level II? Does anyone still sell an upgrade? Thanks! Quote Link to comment Share on other sites More sharing options...
Bruce Tomlin Posted June 20, 2022 Share Posted June 20, 2022 IIRC the socket originally only supported an 8K chip, so for a Model I that old, the 12K of ROM was put on a daughterboard. tl;dr: it requires a hardware mod no matter which way you do it Quote Link to comment Share on other sites More sharing options...
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