Quote:
Originally Posted by burma-shave
I'm working my way through the Amiga Hardware Reference Manual). I'm new to programming at this level and am a bit perplexed by the style used to access hardware registers. The examples in the manual load the base address of the hardware registers into an address register and then use offsets to access each of the registers.
From Page 10 (3rd edition):
Code:
XREF _custom
lea _custom,a0
move.w #$7FFF,intena(a0)
https://archive.org/details/commodor...age/8/mode/1up
So I'm guessing it was expected that _custom could vary between machines, but even then, it's not being resolved at runtime so I'm not sure what the above style is giving you. |
you can replace by:
move.w #$7fff,$dff09a
to disable all interrupts
ps:
custom= $dff000 (not vary between machines)
intena=$9a