issue with DEBUG, please help

[richard]

OPTION_REG = OPTION_REG & $80 | 1 ; Set TMR0 Prescaler to 256, leave RBPU alone

por value for OPTION_REG is 255 (0b11111111)

OPTION_REG & $80 | 1 results in OPTION_REG =129 (0b10000001)
that is not the result you are describing in your comment ; Set TMR0 Prescaler to 256, leave RBPU alone
it also sets the int Interrupt to falling edge of INT pin
for 256 prescaler OPTION_REG bits 0:2 = 0b111

next issue your code is not posted in code tags which makes life difficult .

what do you think will happen to the bit timing accuracy of a software timed serial output routine like debug when you interrupt it 100's of times per second

[Lazuli]

Thank you for the explanation, it is clear now. I just need to modify my board now to use the USART instead

And for next time in order to post code properly, what do you call code tags? Is it the "wrap QUOTE tags" option in the editor?

thanks,
Olivier

[andywpg]

And for next time in order to post code properly, what do you call code tags? Is it the "wrap QUOTE tags" option in the editor?

Nope.  You have to go the advanced editor (at least I do) and select 'Wrap CODE tags'.  Looks like this:  #
Creates a window like this that you can scroll up and down in