Don't bother setting up R12 to point at IOC

This is now a HAL only kernel, and 0x3200000 is most likely somewhere in RAM.

s/PMF/key

@@ -651,12 +651,10 @@ OfferPostKeyStatusUpCall
 ;
 ;       Centisecond tick routine
 ;
-; out:  R12 corrupted
 
 CentiSecondTick ROUT
         Push    "R11, R14"
         LDR     R11, =ZeroPage+KeyWorkSpace
-        MOV     R12, #IOC
 
         LDR     R0, InkeyCounter
         SUBS    R0, R0, #1              ; decrement
@@ -763,7 +761,6 @@ PowerDownMagic
 ;
 ; in:   R1 = 2 if first press; 3 if repetition
 ;       R2 = key number
-;       R12 -> IOC
 ;
 
 GenerateChar ROUT

s/PMF/mouse

@@ -78,7 +78,6 @@ MouseButtonChange ROUT
 
         MOV     R0, #Event_Mouse
         BL      OSEVEN
-        MOV     WsPtr, #IOC
 
 ; Use buffer manager's 'block insert' function
 

s/PMF/osbyte

@@ -806,7 +806,6 @@ Osbyte75
 ; Reflect Keyboard Status In LEDs
 Osbyte76
         LDR     R11, =ZeroPage+KeyWorkSpace
-        MOV     R12, #IOC
         BL      UpdateLEDs
         MyOsbyte