Re: LZ: Info about processor in Ti-85 required


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Re: LZ: Info about processor in Ti-85 required



Richard Gallagher wrote:
> 
> What kind of processor is used in the TI-85.  It is not a Zilog Z80,
> since it is made by Toshiba.  But it is at least compatible to a
> certain degree to the Z80.  Does the TI-85 processor support the full
> instruction set of the Z80?  Does it support any instructions that aren't
> in the Z80 instruction set?True, the cpu is not a ZILOG z80, but it is a z80, it's just a copy 
made by Toshiba.  It's exactly the same instructions and all.  There 
are some undocumented commands, but I wouldn't use those(I think sls 
was the one I remember)
> 
> Also what is the word size of this processor? 8-bit?Memory addresses are 16-bit
> 
> >From what I can recall the Z80 had memory refresh
> circuitry built into it, now it would be silly for TI to put dynamic
> ram in a calculator.  So is it implemented on this processor?  Is
> there an R register?  Is it safe to use it for other uses?
> Yup, memory refresh that's right.  I don't know about different types 
of ram, but it sounds like dynamic is the stuff that stays longer 
than static.  Not sure...
There is an R register, but I wouldn't use it unless you disable the 
interupts, but why would you want to?  You got enough registers and 
stack space and memory
> -----
> Richard Gallagher
> rbg@cvm.co.nz


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