Stepper data from the comments at https://vimeo.com/111417458

stepper.txt

Sub78820
Writes a value (param1 | param0) to field 10
Writes a constant (0x910200) to field 0
Spins until (field_4 & 3) == 2

Sub78848
Writes parameter 0 to field 10
Writes parameter 1 to feild 14
Writes a constant (0xA10200) to field 0
Spins until (field_4 & 3) == 2

Sub7886E
Writes parameter 0 to field 10
Writes a constant (0x910200) to field 0
Spins until (field_4 & 3) == 2
Loads stepper base address and adds 0x80 to it
Writes parameter 0 to offset C from the calculated address

Sub78898 params R0-1
Writes parameter 1 to field 10
Writes (0x900000 + parameter 0) to field 0
Spins until (field_4 & 1) == 0

Sub788BC params R0-2
Writes parameter 1 to field 10
Writes parameter 2 to field 14
Writes (0xA00000 + parameter 0) to field 0
Spins until (field_4 & 1) == 0

Sub788E4 params R0-3
Writes parameter 1 to field 10
Writes parameter 2 to field 14
Writes parameter 3 to field 18
Writes (0xB00000 + parameter 0) to field 0
Spins until (field_4 & 1) == 0

Sub78910 params R0-3, stack[1]
Writes parameter 1 to field 10
Writes parameter 2 to field 14
Writes parameter 3 to field 18
Writes parameter 4 to field 1C
Writes (0xC00000 + parameter 0) to field 0
Spins until (field_4 & 1) == 0

Sub78944 params R0-3, stack[2]
Writes parameter 1 to field 10
Writes parameter 2 to field 14
Writes parameter 3 to field 18
Writes parameter 4 to field 1C
Writes parameter 5 to field 20
Writes (0xD00000 + parameter 0) to field 0
Spins until (field_4 & 1) == 0

Sub7897A params R0-3, stack[3]
Writes parameter 1 to field 10
Writes parameter 2 to field 14
Writes parameter 3 to field 18
Writes parameter 4 to field 1C
Writes parameter 5 to field 20
Writes parameter 6 to field 24
Writes (0xE00000 + parameter 0) to field 0
Spins until (field_4 & 1) == 0

Sub789B2 params R0 return value R0
Writes (0x14 + parameter 0) to field 0
Spins until (field_4 & 1) == 0
Returns field 10