dmsc
commented
4 years ago Hi!
Would it be possible to add an optional 4th parameter to MSET in order to to set every other byte or every 3rd byte etc.?
No, sorry. Implementing an arbitrary step wold be very difficult without changing the whole code. Only way would be to add a new routine to do the "set with step".
Currently, MSET uses the same code used to clear variables and strings at startup, and to clear arrays on DIM, so it has to be fast.
Why do I want this? In order to scroll I need to change every 3rd value in the DL with something like this:
I understand, but a truly generic version would also need a step for the value to write - your example works because you are probably using 256 bytes for each line.
[about doing a FOR loop]
This is pretty slow and I actualy unroll the loop to get a bit of extra speed. If I could do this with the speed of MSET it would be way better, especially for 10 liners.
Perhaps one day FastBasic would be fast enough that this is not a problem :)
ukcroupier
Would it be possible to add an optional 4th parameter to MSET in order to to set every other byte or every 3rd byte etc.?
eg. MSET address, length, value[,step]
Why do I want this? In order to scroll I need to change every 3rd value in the DL with something like this:
pause 0 for i=DLscroll to DLscroll+51 step 3 poke i,y next
This is pretty slow and I actualy unroll the loop to get a bit of extra speed. If I could do this with the speed of MSET it would be way better, especially for 10 liners.