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 > _______________________________________________ > QL-Users Mailing List > -- Dave Park d...@sinclairql.com _______________________________________________ QL-Users Mailing List