Re: A85: Memory Mapped Devices
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Re: A85: Memory Mapped Devices
A.K.A. TheWiz wrote:
>
> > Does anyone know how Memory Mapping is done? Like, for example, the
> > screen on the TI-85 or 92? I'm not looking for anything real
> > specific,
> > just a somewhat general explination as to how it is done/how it
> > works.
> > And actually, something more from a hardware standpoint. ;)
>
> Various chips are used to determine the address being read/written,
> and if
> it's in a certain range (usually having high bits set down to a
> certain one,
> which is why VRAM on the calculator is at the end), it's sent to the
> mapped-in device.
Where can I get these "chips"? ;) Or is it just logic? If it's logic,
anyone got any schematics I might look at? ;)
> HTH.
ISD.
Cheers,
--
~Keith
TSK3000@Prodigy.Net
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