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284 B
ArmAsm

;
; __do_oserror updates __oserror and errno. Do a JMP here right after
; calling CIOV. It will return with AX set to -1 ($FFFF). It expects the CIO
; status in Y.
;
.include "errno.inc"
.export __do_oserror
__do_oserror:
tya
jmp __mappederrno