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From: ranger@ecsvax.UUCP (Rick N. Fincher)
Newsgroups: net.micro.apple
Subject: Re: Enhancement Questions
Message-ID: <1920@ecsvax.UUCP>
Date: Wed, 13-Aug-86 09:33:17 EDT
Article-I.D.: ecsvax.1920
Posted: Wed Aug 13 09:33:17 1986
Date-Received: Thu, 14-Aug-86 20:24:40 EDT
References: <513@dg_rtp.UUCP>
Organization: UNC Educational Computing Service
Lines: 48

> 
> Okay, gang, a couple of questions about the IIe enhancement kit:
> 
> My understanding is that I get
> 
> 	1) A new character generator ROM
> 	2) A new CD ROM
> 	3) A new EF ROM
> 	4) A 65C02 CPU
> 
> What are the differences between the old and new chargen ROMs?  As far as
> I can tell (by working on both a IIe and a //c), the inverse uppercase
> letters have been replaced with mouse icons.  Is this the only difference?
  The new chargen ROMs can generate upper and lower case characters in both
normal and inverse and can display mousetext, all can be mixed on the 
screen at the same time.

> 
> Is the 65C02 pin compatible with my current 6502?  What new instructions
> do I get?  Do I lose any?  Where can I get a data sheet for the 65C02?
> 
  You don't lose any instructions.  You get several new, more efficient,
instructions and addressing modes.  BRA (Branch Always) is an example of 
a new instruction.  You no longer have to set a status flag to branch.
Data sheets are available in the IIc reference manual, from GTE, the Western
Design Center and from Rockwell.  The Rockwell chip has several nonstandard

instructions that are not on the other chips.
> Did the published entry points for monitor routines stay the same in
> the new ROMs?  Are the new ROMs the cause of the longer interrupt
  Yes, the entry points are the same.  The new ROMs bring back the mini
assembler, add a search command , improve screen updating, do not shut off
interrupts for long periods and allow interrupts with multiple banks of 
memory.  The addition of the ability to interrupt with expanded memory
causes the interrupt routine to be longer, but , if you can live with that
the new ROMs are by far superior.

Rick Fincher
> handling times that was discussed here a couple of weeks ago?
> 
> 						Thanks,
> 						Karl
> 
> -- 
> 
> 				Karl M. Owen
> 				Data General, RTP, NC
> 				...!seismo!mcnc!rti-sel!dg_rtp!owen