If I remember correctly, the offsets were measured in words (16 bits on the M68k), and then you had scroll registers where you could offset with 0-15 pixels. T

If I remember correctly, the offsets were measured in words (16 bits on the M68k), and then you had scroll registers where you could offset with 0-15 pixels. This was complicated a bit since you only had two scroll registers, one for even and one for odd bitplanes. No idea how this was implemented in hardware.