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From: fred@cbmvax.UUCP (Fred Bowen)
Newsgroups: comp.sys.cbm
Subject: Re: memory map conflict....
Message-ID: <2371@cbmvax.UUCP>
Date: Mon, 21-Sep-87 16:38:02 EDT
Article-I.D.: cbmvax.2371
Posted: Mon Sep 21 16:38:02 1987
Date-Received: Wed, 23-Sep-87 01:13:47 EDT
References: <1556@killer.UUCP>
Organization: Commodore Technology, West Chester, PA
Lines: 37

This is a re-posting of something that I originally posted last Friday
after a system crash- the system date was fubar, and you may not have seen it.

In article <1556@killer.UUCP>, elg@killer.UUCP (Eric Green) writes:
> 
> On page 265 of my Programm's Ref (C-64), for the map at the bottom, it says
> that for loram=1,hiram=1,game=0,exrom=0, an 8K ROM cartridge is switched into
> $8000-$A000. 
> 
> On page 266, for the map at the bottom, it says that for
> loram=1,hiram=1,game=0,exrom=0, a 16K ROM cartridge is switched into
> $8000-c000. 
> 
> Same signals, two different memory maps??? Something's not right here!
> 
> Also, another question -- is the *SRQIN line ever used, at all, in a Commodore
> 64? Is its connection to the *FLAG line on CIA#1 ever used in the disk
> routines of either the C64 or C128?  Seems that the fast disk mode clickin'
> away would give that *FLAG line a lot of excercise!
> 

You found an old typo in the manual- the memory map with 8K of cartridge
ROM should specifiy /game=1, not /game=0  (not, these are inverted signals).
The map with 16K of cartridge ROM is correct as it is.

The SRQ line is simply passed to the user port in the 64 *and* 64 mode of
the 128- this allows little Johnny's weather station to work.  In 128 mode,
this line is used by the fast/burst serial routines- little Johnny's station
won't work so good here.

--
-- 
Fred Bowen			uucp:	{ihnp4|rutgers|caip}!cbmvax!fred
				arpa:	beats me
				tele:	215 431-9100

Commodore Electronics, Ltd.,  1200 Wilson Drive,  West Chester,  PA,  19380