INT E0 - ConcCP/MConcurrent CP/M by Digital Research, now DR Multiuser DOS,DR Multiuser DOS - "Q_CREAD" - CONDITIONALLY READ MSG QUEUE
	CL = 8Ah
	DS:DX -> queue parameter block (QPB) (see #04044,#04045)
Return: AX = status (0000h success, FFFFh failure)
	CX = error code (see #04021)
Note:	also supported by REAL/32
SeeAlso: INT E0/CL=87h,INT E0/CL=89h,INT E0/CL=8Ch,INT E0/CL=B6h