II+ ROM

II+ ROM

Post by Joe Luzz » Sun, 04 Oct 1992 09:58:31



                                                               Time: 4:39
PM
                                                               Date:
10/2/92
Subject:  II+ ROM

There is a socket on my friend's II+ mother board labeled "ROM SPCL" and
the chip number is 2716.  Can anyone tell me what this chip does?

Thanks.

------------------------------
Joe M. Luzzi

CSU Fullerton

 
 
 

II+ ROM

Post by Todd P. Whites » Mon, 05 Oct 1992 07:31:37



>There is a socket on my friend's II+ mother board labeled "ROM SPCL" and
>the chip number is 2716.  Can anyone tell me what this chip does?

It's the character generator. All the bitmaps for the various text characters
are stored in it.

Todd Whitesel


 
 
 

II+ ROM

Post by Mauricio Tavar » Thu, 08 Oct 1992 00:06:03




|>
|> >There is a socket on my friend's II+ mother board labeled "ROM SPCL" and
|> >the chip number is 2716.  Can anyone tell me what this chip does?
|>
|> It's the character generator. All the bitmaps for the various text characters
|> are stored in it.
|>
|> Todd Whitesel

        2716, if I am not mistaken is an EPROM.

 
 
 

II+ ROM

Post by Todd P. Whites » Thu, 08 Oct 1992 14:38:29



>    2716, if I am not mistaken is an EPROM.

You are correct, it is an EPROM, but not a blank one. The data it has been
programmed with is a set of bitmaps, one for each character the text screen
can display. In the very early days of the Apple II, a 2513 character generator
ROM was used, hence the designation "ROM SPCL". I forget what point they began
using pre-programmed 2716's instead, but I know it was before revision 7 since
my original II+ was that and it used a 2716. I replaced it with custom 2716's
of my own a few times; it is neat to do everything in a totally different font
and still have the speed of the text screen. Any time you see "II+ lower case
character generators" being sold they are simply programming a 2716 with a //e
character set and selling it. I made one of those too; it's still in my II+.

Todd Whitesel

 
 
 

1. Apple II ROMS: roms.zip - roms.zip (0/1)

Just thought I'd post this. Enjoy...


--------< ZoRiN (The Furry One) >-------------------------------------------
  "Go dust off the nuclear reactor. And test all the buttons." - Batduck  
  "Au revoir, mon petite potato du couch!" -- Fifi la Fume                
=================================================EqualEqualEqual============  
Pumbaa: You gotta put your behind in your past.
Timon:  No, no, no. Amateur. Lie down before you hurt yourself... It's "you
        gotta put your past behind you."
----------------------------------------------------------------------------

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