[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Old Index]
Re: VAX RPB (Restart Parameter Block)
>>> What does this blbc instruction?
>> branch if low bit clear. branches if bit 0 is clear.
> Hmm, yes, googled that already, wanted more to know if there is a
> offset involved or so or if r11 must really set to 0xffea01, the
> address of that "SLU Available" thing, or to 0xffea00, the address of
> the cpmbx.
Well, 1001(r11) means the address of the operand (meaning its low byte,
since it's a longword) is the value in r11 plus 1001. That line came
from my disassembler, so the offset (1001) is in hex.
So if the SLU-available bit is at ffea01, r11 would need to hold ffda00
for that to be what it's accessing.
/~\ The ASCII Mouse
\ / Ribbon Campaign
X Against HTML mouse%rodents-montreal.org@localhost
/ \ Email! 7D C8 61 52 5D E7 2D 39 4E F1 31 3E E8 B3 27 4B
Main Index |
Thread Index |