I also studied a few other interpreters, especially paying close attention to their floating point code. If you find and understand their add/mul/div routines, you're in. I used this knowledge to write a x86 float FP emulator in the 90's which I used on some commercial projects.
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These BASIC interpreters were pretty amazing. The way the MS engineers handled upgrading the interpreters (from Color Basic, to Extended Color Basis, to Disk Basic) just by inserting more ROM's was pretty impressive.
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The 6809 Color Computer's interpreter was ported from Microsoft's earlier non-6809 versions.
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I learnt so much from the Complete Spectrum ROM disassembly Z80. IIRC they used every single byte of the 8K. The circle drawing was particularly efficient.
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Always have a special place in my heart for BASIC. My introduction to computer programming was GWBasic, and later Quickbasic. Now I’m doing PHP. Apparently sold my soul to the devil or something.

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