A83: Two graphical problems to solve.

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A83: Two graphical problems to solve.


Hi folks!

The TI-83 Plus Developer Guide at page 77 states that a delay is
necessary between two accesses of the video driver (ports 10h,11h). Then
it presents the lcd_busy routine.

lcd_busy:
          PUSH AF
          INC HL
          DEC HL
          POP AF
          RET

That's 11+6+6+10+10 for the routine itself plus an additional 17 clock
cycles for the needed call to that routine. Slow as the display driver
may be, I don't think that it needs 60 clock cycles to catch up. Does
anybody have experience with the minimum amount of delay cycles it
*really* needs?


Is there a 83+ equivalent to the TI-86 Eble/Hopp FindPixel-Routine, one
that addresses a bit image buffer (like plotSScreen) that can later be
copied via "GrBufCpy" (or a similar routine) to the Display?

Thanks in advance for any (good?) comments.


Martin
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