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From: michaelk@azure.UUCP (Mike Kersenbrock)
Newsgroups: net.micro
Subject: Re: Will the real Amiga stand up!
Message-ID: <413@azure.UUCP>
Date: Thu, 15-Aug-85 01:56:01 EDT
Article-I.D.: azure.413
Posted: Thu Aug 15 01:56:01 1985
Date-Received: Mon, 19-Aug-85 07:36:46 EDT
References: <1087@wucs.UUCP>
Organization: Tektronix, Beaverton OR
Lines: 33

> Questions
> 
> 1: How much real ROM exists and what is in it.
> 
> 2: How much RAM exists and how does the write protection work. (i.e. can the
>        size of the protected area be programmable)
> 

I have no idea, but if I were them, it sure would be handy (during OS
development) to have the OS in writeable memory (either in temporary
added RAM or "mapped-in" using an in-circuit uP emulator
(my employer makes very good ones (plug) which we use ourselves)).  It will 
be interesting to see what version is the "production version" and to see if
it stays that way. 

> MOST IMPORTANT QUESTION!!!!
> 3: Is the memory data path 8 or 16 bits wide!!!!!!!!
> 
> 
> Dale Frye @ Washington University in St. Louis

The block diagram in Byte magazine showed seperate data busses
for the (UVEP)ROM and the RAM with a bit of circuitry between them.
Because the 68000 is 16-bit WORD oriented, and because
you can use paging-mode tricks with DRAMs (you double-CAS the parts),
you COULD make 8-DRAMs do a very decent job with word-accesses.  Not having
the Amiga schematic handy :-), I wouldn't know if they actually
do this.


Mike Kersenbrock
Tektronix Software Development Products
Aloha, Oregon