Indirect: dr0 and rr0

In the control cabinet four sensors hang on d0 to d3. Writing four almost identical blocks is tedious, and with six pins it does not get better. Better: the pin number sits in a register, and a loop goes through them.

dr0: a pin from a register#

dr2 means: the pin whose number is currently in r2. If r2 holds a 3, dr2 is the same as d3.

move i 0
pin:
l temp dr0 Temperature    # dr0: pin with the number from r0
add i i 1
blt i 4 pin

This works wherever a pin may appear: l, s, ls, sdse, bdns and so on.

rr1: register via register#

The same exists for registers. rr1 means: the register whose number sits in r1.

move r1 10
move rr1 42        # writes 42 to r10
add r1 r1 1
move rr1 43        # writes 43 to r11

That way you build a small table in the registers, for instance the temperatures of four pins in r10 to r13. Several r work too: rrr1 first reads r1, takes the value as a register number, reads there and takes that value as the number.

If a register number lies outside 0 to 17, the chip reports OutOfRegisterBounds. A pin number outside 0 to 5 also leads to an error.

Loop over pins#

Put together, this gives a loop that checks every pin, reads it and puts the value into its own register:

move i 0
pin:
add target i 10        # target registers r10 to r13
move rr1 0             # start value in case the pin is empty
bdns dr0 next
l rr1 dr0 Temperature
next:
add i i 1
blt i 4 pin

Here i is an alias for r0 and target an alias for r1.