The flash bit acts as half a toggle for latching of the BGCOLOR in the
8301, ANDed with the other component, the 1Hz clock.
On Fri, Oct 27, 2017 at 2:42 PM, Jan Bredenbeek via Ql-Users <
ql-users@lists.q-v-d.com> wrote:
> On 27 October 2017 at 21:03, Peter Graf <pg...@q40.de> wrote:
>
> > > E.g. when a pixel has red colour with flash on, the rest of the pixels
> > > on the line will flash between the original pixel colour and red until
> > > the next set flash bit.
> >
> > The "until" is ambiguous. When that next pixel occurs, does it still use
> > the background colour of the previous pixels, or already the colour in
> > it's own colour bits?
> >
>
> The flashing is up to and including the pixel which has the flash bit on to
> turn flash off.
> This can be seen when PRINTing something with flash on. Each character is 6
> bits wide, but only the least significant ('rightmost') 5 bits are used as
> the leftmost bit is always 0. This is the bit used to turn flash on, and
> when flash is on the flash bit of the LSB (rightmost) bit is also on so
> flash is turned off after each character (even when you print multiple
> characters on the same line).
>
>
> > Also, is there any exact info about the blink frequency?
>
>
> I've tested this on a real QL and it looks like the blink frequency is
> 16/50th of a second which is a bit slower than the software-generated
> blinking of the window's cursor (12/50th second). So a complete blink cycle
> will be 32/50th second.
>
> Jan.
>
> --
> *Jan Bredenbeek* | Hilversum, NL | j...@bredenbeek.net
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> QL-Users Mailing List
>
--
Dave Park
d...@sinclairql.com
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