Path: utzoo!utgpu!jarvis.csri.toronto.edu!rutgers!mcnc!rti!xyzzy!dg-rtp.dg.com!berdia
From: berdia@dg-rtp.dg.com (Sanjay Berdia)
Newsgroups: comp.sys.ibm.pc
Subject: character codes
Message-ID: <2870@xyzzy.UUCP>
Date: 2 Feb 90 23:02:55 GMT
Sender: usenet@xyzzy.UUCP
Reply-To: berdia@dg-rtp.dg.com
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I have a few questions regarding the IBM defined ASCII and extended 
character set ( and code pages ).

    1.  Could someone shed some light on the (IBM defined) ASCII
	character 124.  Is it a broken bar or a vertical bar ? I have
	found some documentation that says it's a broken bar and some that
	says it's a vertical bar.  PCs that I have used display a
	broken bar.  Is the manufacture of the display adapter the issue ?
	What about code pages ?  If you have the time, could you try to 
	print ASCII char 124 and email me the results, what version of
	DOS you are running, the code page if applicable, and the
	manufacturer of your display adapter.

    2.  Do international versions of DOS prior to 3.3 down load a different
	standard and/or extended character set other than the default
	IBM character set ? If so, do they match one of the standard code
	pages defined today.

    3.  Could someone please tell me what the following character codes
	represent.

	Code Page       Key 	Comments   
	---------       ----	--------------------------------	
	437		0x9E	
	 "		0xA9
	 "		0xAA
	 "		0xEE	is this a small letter epsilon as it appears
				in the definition of code 437 or is it a 
				symbol representing "member of a set"
	 "		0xF9
	850		0xEE
	 "		0xF0	is this a hypen (0x20) ? If so, why is it
				there ?
	 "		0xF2

    4.  Why do I get two make/break codes when I press the Print Screen key ?
	Note, when I type Shift-Print Screen or Ctrl-Print Screen, I only
	get one make/break code for the Print Screen key.  I am using a
	101 keyboard.

    5.  When I press Num-lock or Scroll-lock on a 101 keyboard, two 0xFA 
	codes are send by the keyboard controller before the make/break
	key combinations.  Why does this happen ? Is the ACK command being
	sent ? I have tried to check to see if it is a command with no
	luck.  Any pointers would be greatly appreciated.

If anyone can help, please send me email.  If there is enough interest, I
will post a summary.

Sanjay Berdia
berdia@dg-rtp.dg.com