Routines
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FCD1: check read/write pointer
Used by the routines at F5ED, FA60 and FBCD.
return Cb = 1 if pointer >= end
FCD1 38 SEC set carry for subtract
FCD2 A5 AC LDA $AC get buffer address low byte
FCD4 E5 AE SBC $AE subtract buffer end low byte
FCD6 A5 AD LDA $AD get buffer address high byte
FCD8 E5 AF SBC $AF subtract buffer end high byte
FCDA 60 RTS
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