Posted By
siz
on 2014-09-05
15:28:48
|  Re: New to Plus4 scene - Introduction and SD2IEC and 1541 loading issues
I think it's not a problem with the memory. BASIC stores the variables downwards from the end of available memory ($fd00 in case of a 64k machine) and your cycle reached and overwritten one of the variables (most probably TI$) and generates some garbage which breaks the BASIC program execution. 
Edit: to answer your original question: try to switch off JiffyDOS (if it's switchable or swap back the original KERNAL if not) and try out software with that. I found some compatibility issues with JiffyDOS in case of a few programs.
Edit2: I've checked Threeve in YaPE with JiffyDOS ROM image for both the plus/4 and 1541 from a D64 image and it loads and works fine with JiffyDOS. Try stock KERNAL.
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