Enhancement to ' SET /SPEED ' command

	The SET /SPEED commands of VMR and MCR have an
unfortunate feature. The speed codes for external speeds
on a DH-11 do not match syntacticaly. VMR must have
exactly { EXTA | EXTB }; MCR is { A | B }. For example:

	SET /SPEED=TT42:EXTB:EXTA		( VMR )
	SET /SPEED=TT42:B:A			( MCR )

	To add to this, VMR exits if it processes a MCR
format command, so we can't use both in one file and ignore
the error messages. The only way out is to hack MCR to
accept VMR format commands. This has turned out to be
ridiculasly easy.

	Get into [12,10]SFDOV.MAC with your favorite editor, and find
the 3 tables at the begining of the code. They have the labels CODES:,
SPEEDS:, and SPDADR:. Add to each two entries for the external speeds,
after the originals. In the table of ASCII speed codes add /EXTA/ and
likewise for B. Below is an extract of the new file.

CODES:
	.WORD	S.19.2		; 19200 BAUD
	.WORD	S.EXTB		;
	.WORD	S.EXTB		;<< NEW
	.WORD	S.EXTA		;
	.WORD	S.EXTA		;<< NEW
	.WORD	S.9600		;

		.
		.
		.

SPEEDS:
SU:	.ASCIZ	/19200/
ST:	.ASCIZ	/B/		;
ST1:	.ASCIZ	/EXTB/		;<< NEW
SS:	.ASCIZ	/A/		;
SS1:	.ASCIZ	/EXTA/		;<< NEW
SR:	.ASCIZ	/9600/		;

		.
		.
		.

SPDADR:
	.WORD	SU   
	.WORD	ST		;
	.WORD	ST1		;<< NEW
	.WORD	SS		;
	.WORD	SS1		;<< NEW
	.WORD	SR		;

	The lines marked <<NEW are the additions.
	Reassemble, insert into MCR.OLB, ( don't forget /-EP )
and rebuild MCR. Re-VMR your system to update MCR and you'r done.