Stormbringer (48k): Routine at 44225

44225: Flash border and screen and decrease Magic Knight's magic level if level is at least C

Used by the routines at 43950, 44001, 44063, 44100 and 44198.

Input
C	Cost of spell

Output
A	Magic Knight's magic level if less than C, otherwise zero
F	Carry flag set if Magic Knight's magic level is less than C, reset otherwise

44225

LD A,(24771)

Load Magic Knight's current magic level into A...

44228

AND 127

...

44230

CP C

If this is less than C...

44231

RET C

...then return

44232

LD A,(24771)

Load B with unused bit...

44235

AND 128

...

44237

LD B,A

...

44238

LD A,(24771)

Load Magic Knight's current magic level into A...

44241

AND 127

...

44243

SUB C

...subtract C...

44244

OR B

...combine with unused bit...

44245

LD (24771),A

...and store

44248

CALL 64548

Flash border and screen (as in cast a spell)

44251

XOR A

Set A to zero

44252

RET

Return