#"Unused" 8085 opcodes
Gary, I'm a CIS newcomer, so if you sell an M100 Forth, it's news to me –
interested in knowing more!
Comment: before I lost interest, I was implementing a TIL for the M100. HL
was the "natural" choice for the data stack pointer, UNTIL I doped out the
mystery opcodes: DE is a much better choice if you use 'em (leaves HL free for
arithmetic, and the D9 & ED opcodes allow DE to be used as an indirect adr for
full-word load/stores of HL). It is, I admit, frightening to have such a BASIC
design decision dependent on presumably unsupported features!… tim
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