Variable list for DONKEY.BAS (1981)
Part of the line-by-line code walkthrough by MaiZure

Original source code:
http://www.maizure.org/projects/decoded-donkey-bas/DONKEY.BAS

Walkthrough:
http://www.maizure.org/projects/decoded-donkey-bas/donkey_decoded.txt

B% - Center line pixel pattern array for animation offset
C1% - Pixel array for the left half of the car
C2% - Pixel array for the right half of the car
C1X - Temporary left car part pixel array X position
C2X - Temporary right car part pixel array X position
C1Y - Temporary car part pixel position (for both parts despite the name)
CAR% - Entire car graphic pixel array
CMD$ - Keyboard input
CX - Current player car X position  
CY - Current player car Y position
D1% - Pixel array for the left half of the donkey
D2% - Pixel array for the right half of the donkey
D1X - Temporary left car part position
D2X - Temporary right car part position
DNK% - Entire donkey pixel array
DX - Current donkey X position
I - Generic iterator
P - Iterator for the crash sequence
SAMPLES$ - Hardcoded trigger for a separate program loader
SD - Donkey score
SM - Player score
Y - Current donkey Y position
Z - Vertical offset for car/donkey parts