HP HP-11C - Page 133

Section 9: The Index Register 131
2. If nnnnn is <0, (1] branches execution directly to the
occupied line number specified by the absolute value of
nnnnn.
For example:
R, [5.010| 000- R,[-5.010
nnnnn =5 001 - Instruction nnnnn = -5
002- Instruction
003- [GT0][1] -
004 - Instruction
—
L——
005- Instruction
006- Instruction
‘l 007- [LBL]5
008- Instruction
r_—‘——__!
|
|
Indirect Subroutine Label or Line Number. In a running
program, (1] indirectly transfers execution to a subroutine in
the same way that (1] indirectly transfers execution to a
branch.
Indirect Addressing Table
(GTO]or [GSB][1] (sTo]{(]er [ReL](()]
If nnnnn is: transfers addresses
execution to: storage register:
0 [){LBL]O Ro
9 [M(IeL)9 Ro
10 v Ro
" o R
12 " R,
13 " (D] R
14 . R4
15 — Rg
16 — R
17 - R
18 — Rg
19 — Rg
20 — R,