Restore Registers

The RESREG routine restores assigned registers that have been saved between executions of the assembly language portions of the simulator. (See also SAVREG, FETCH and STORE.) The register save area is available to the FORTRAN code which freely reads and modifies it.

RESREG   PS
          SA1    MA
          SB1    1
          BX3    X1
          SA1    A1+B1
          BX4    X1
          SA1    A1+B1
          BX5    X1
          SA1    A1+B1
          SA2    A1+B1
          LX2    12
          BX2    X2+X1
          SA1    STEP
          SB2    X1
          SX0    7777B
          EQ     RESREG

The registers are stored into sequential locations within a common block of memory.

          USE    /REGS/
SR       BSS    1
MA       BSS    1
MD       BSS    1
PC       BSS    1
AC       BSS    1
LK       BSS    1
MQ       BSS    1
STEP     BSS    1
          USE    *

PDP-8 Simulator