Upside-down jetpac graphics encoding?

[phillipeaton]

Hi Pob, I was having a look at the binary numbers defining this graphic and they don't seem to match the graphic. Looking a bit closer, I then spotted that the data is upside down and mapped in 16-bit words, not bytes! Is that something you'd previously noticed? I spotted the some thing on one of the rocket bitmaps I looked at. I have found the same graphic in the VIC-20 version and the numbers are the right way up and mapped in bytes only.

My numbers are:

fcb     %00011000 ; 3D83: 18 
fcb     %11111111 ; 3D84: FF 
fcb     %11111111 ; 3D85: FF 
fcb     %10001011 ; 3D86: 8B 
fcb     %10111011 ; 3D87: BB 
fcb     %10011011 ; 3D88: 9B 
fcb     %10111011 ; 3D89: BB 
fcb     %10001001 ; 3D8A: 89 
fcb     %11111111 ; 3D8B: FF 
fcb     %11111111 ; 3D8C: FF 
fcb     %00011000 ; 3D8D: 18 
fcb     %00011000 ; 3D8E: 18 
fcb     %11111111 ; 3D8F: FF 
fcb     %11111111 ; 3D90: FF 
fcb     %10001010 ; 3D91: 8A 
fcb     %10111010 ; 3D92: BA 
fcb     %10001010 ; 3D93: 8A 
fcb     %10111010 ; 3D94: BA 
fcb     %10111000 ; 3D95: B8 
fcb     %11111111 ; 3D96: FF 
fcb     %11111111 ; 3D97: FF 
fcb     %00011000 ; 3D98: 18 

or with the 1's removed:

 fcb     %000  000 ; 3D83: 18
 fcb     %         ; 3D84: FF
 fcb     %         ; 3D85: FF
 fcb     % 000 0   ; 3D86: 8B
 fcb     % 0   0   ; 3D87: BB
 fcb     % 00  0   ; 3D88: 9B
 fcb     % 0   0   ; 3D89: BB
 fcb     % 000 00  ; 3D8A: 89
 fcb     %         ; 3D8B: FF
 fcb     %         ; 3D8C: FF
 fcb     %000  000 ; 3D8D: 18
 fcb     %000  000 ; 3D8E: 18
 fcb     %         ; 3D8F: FF
 fcb     %         ; 3D90: FF
 fcb     % 000 0 0 ; 3D91: 8A
 fcb     % 0   0 0 ; 3D92: BA
 fcb     % 000 0 0 ; 3D93: 8A
 fcb     % 0   0 0 ; 3D94: BA
 fcb     % 0   000 ; 3D95: B8
 fcb     %         ; 3D96: FF
 fcb     %         ; 3D97: FF
 fcb     %000  000 ; 3D98: 18