[A83] Re: Turning calc off
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[A83] Re: Turning calc off
On Mon, 20 Jan 2003 16:11:11 -0600, Jeff wrote:
> > > Hey, wait a minute - outputting 1 to port 3 will cut power to the
> > > LCD also, that's what I've heard.
> >
> > true, but lcd != lcd driver
>
> Well, on that note, outputting a 2 to port 16 will not turn off the
> lcd driver either. It just tells the lcd driver to turn the display
> off, not affecting the data in display RAM.
Hmm, I believe by display they mean if the driver is outputting
something to the lcd or not.
"This 1-bit register holds the display ON/OFF state. In the OFF state,
the output data from the display RAM is cleared. In the ON state, the
display RAM data is displayed. The display ON/OFF state does not affect
the data in the display RAM."
Also, bit 3 of port 3 controls the lcd power on every z80 calc (83+
too?), even the 85/86 which do not have a display driver like the 82/83
series.
References: