Re: A86: gbdk

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Re: A86: gbdk


From: Jimmy Mårdell <yarin@acc.umu.se>

>[The gameboy cpu] uses the Z80 mnemonic though.
>For instance, on the 8080 the "ld" instruction was "mov",
>the register were called by numbers instead of letters etc.

That sounds like an assembler issue rather than a processer issue.  'Course
I don't know much about the acutal implimentation details of an assembler,
but it seems like the mnemonics and  register names could be anything at
all, as long as the assembler knew what opcodes to generate from them.

>The Z80 contains all 8080 instructions (same opcodes) + lots of new ones.
>Thus, there are LOTS of Z80 instructions missing on the GB CPU.
>Also, it runs at 4.2MHz/8.4MHz.

So what is the attraction of the GB from a programming standpoint?  More
memory?  Better IO?

later
DK
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