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From: aep@abic.UUCP (Alex Pensky)
Newsgroups: net.micro.cpm
Subject: Re:  8251 Usart
Message-ID: <716@abic.UUCP>
Date: Fri, 3-Jan-86 18:11:07 EST
Article-I.D.: abic.716
Posted: Fri Jan  3 18:11:07 1986
Date-Received: Sun, 5-Jan-86 01:11:14 EST
References: <1110@brl-tgr.ARPA>
Organization: Allen-Bradley Co., Highland Heights, OH 44143
Lines: 11

> INITIALISE:	MVI	A,RESET 	;Puts 8251 in instruction mode
> 		OUT	MCNTR		;
> 		MVI	A,MINIT1	;sets up baud, etc.
> 		OUT	MCNTR		;
> 		MVI	A,MINIT2	;Puts 8251 back in normal mode
> 		OUT	MCNTR
> 		JMP	0
Hmm, how about that JMP 0? Does your BIOS reset the 8251 and write
"reasonable" MINIT1 and MINIT2 bytes to it on a warm boot? Mine sure
does (SANYO MBC-1000).  I use a routine just like yours but I just
return after calling it.