Talk:Z80 Routines:Graphic:Fastcopy

The di is not that dispensible. The display may be messed up if an interrupt that displays to the screen occurs during the fastcopy routine. It's not the end of the world if this happens, but it's worth the extra byte to prevent it. --Dan Englender 07:11, 25 Apr 2005 (PDT)

Warnings?

Also, what would we say about the new issues with the bad LCD drivers? Can we provide a fast routine that will support the bad drivers? --JasonM 16:38, 25 Apr 2005 (PDT)

I added a Safe Copy routine, since there isn't really a reliable timing to suggest.--Jim e 11:00, 26 Apr 2005 (PDT)

Is is still faster than the _grbufcpy BCALL ? Guillaumeh 12:35, 26 Apr 2005 (PDT)

Of course, it should only take slightly longer than fastcopy, but will always work.--Jim e 14:51, 26 Apr 2005 (PDT)

I clarified what was going on with the messed LCDs a bit. Should we put something on the top of this page so programmers are alerted to this problem? --JasonM 15:07, 26 Apr 2005 (PDT)

We could make a template for it, saying something like "This code may not work properly on some calculators due to manufacturing differences." --AndyJ 15:34, 26 Apr 2005 (PDT)

MirageOS's fastcopy does not disable interrupts, while Ion's does. Anyone trying to emulate MirageOS should know that, or else MirageOS programs that assume interrupts are enabled and halt (Yahtzee) may crash.--Dwedit 19:56, 26 Apr 2005 (PDT)

True, but this isn't necessarily pertaining to MirageOS, or any shell for that matter. A nostub program would need to disable interrupts or disable the busy indicator. A note should be made about why DI could dispensible, if a person disables the busy indicator.--Jim e 20:16, 26 Apr 2005 (PDT)

And when the cursor flash has been disabled.--Kalimero 03:22, 27 Apr 2005 (PDT)

Well the cursor should only flash if the edit buffer is open, and shouldn't be.--Jim e 07:16, 27 Apr 2005 (PDT)

What about grapher cursors? They dont need edit buffers.--Woozle

Well now that's just pushing towards a different topic. "When do you need to use fastcopy." I guess something should be said about when you would need to fastcopy and when ti-os handles it for you.--Jim e 14:05, 27 Apr 2005 (PDT)