TODO:
- DONE fix setting of pointer @45
- DONE properly save & restore device number (now set to 8)
- finish the INSTALL utility program: save all blocks, run B-A
- kmon: slow output in conversion on c128
- bootctl, prefs
end 64 = 41349 = $a185 @45 end 128 = 46469 = $b585 @174
clc
lda EAL
sbc SAL
sta EAL
lda EAL+1
sbc SAL+1
sta EAL+1
tax