Routines
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B98C: Step an object through four frames
Used by the routines at upd_160_to_163 and chaser_chase.
Increments the low two bits of the type and leaves the rest alone, so 160 goes to 161, 162, 163 and back to 160.
next_graphic_no_mod_4 B98C LD A,(IX+$00) type with its low two bits plus 1, modulo 4
B98F LD C,A
B990 AND $FC
B992 LD B,A
B993 LD A,C
B994 INC A
B995 AND $03
B997 OR B
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