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6800 Details
Hello!
I've implemented an Altair 680 on a Spartan-3E FPGA, unfortunately getting BASIC to load is giving me difficulties. I've found two versions of BASIC online and tried both with little success. I think my problem is the setting of the flag registers. Anyway, I guess my question is, do the TBA and TAB instructions affect the flag registers? Also, what is the proper behavior for CPX, ROR, ASR, and LSR? For a little background, I'm using a Spartan-3E starter kit attached to a VT-320. I'm using 16k of RAM (which is loaded on reset with BASIC) all implemented in the FPGA. If anyone's interested in the source (all Verilog), I'd be more than happy to provide it. Thanks! |
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