Path: utzoo!attcan!uunet!lll-winken!ncis!helios.ee.lbl.gov!pasteur!ucbvax!agate!bionet!csd4.milw.wisc.edu!jgreco
From: jgreco@csd4.milw.wisc.edu (Joe Greco)
Newsgroups: comp.sys.cbm
Subject: Re: Another info request for old CBM computers
Message-ID: <480@csd4.milw.wisc.edu>
Date: 19 Jan 89 22:59:26 GMT
References: <2035@iitmax.IIT.EDU> <448@csd4.milw.wisc.edu> <2748@mibte.UUCP>
Sender: news@csd4.milw.wisc.edu
Reply-To: jgreco@csd4.milw.wisc.edu (Joe Greco)
Organization: UW-Milwaukee Home for Out-of-date 8 bit Hackers
Lines: 51

In article <2748@mibte.UUCP> jbh@mibte.UUCP (James Harvey) writes:
>In article <448@csd4.milw.wisc.edu>, jgreco@csd4.milw.wisc.edu (Joe Greco) writes:
{mass kill.. munch chomp [burp]}
>> I'm not too sure.  I've heard alternating stories that it works like
>> the SuperPET's extra 64K and that it can be banked in and out (more
>> like the 64).  In any case, it is not DIRECTLY usable and is probably
>> the most useful to machine language programmers.
>> 
>>>2) How do I drive the onboard film speaker, besides printing CTRL-G?
{urp}
>I have one also.  I also have two of the 64K memory expansion
>boards and SOMEWHERE there is a manual for them that describes
>how to do the banking.  I remember you have to poke a memory
>location with a bank number and mabye another location to
>initiate the banking.  I'll try to dig it up.  This is best done
>from Machine Language of course.

If you can tell me whether the memory is banked in 4K segments or not,
I might be able to help.  The SuperPET banks in 4K segments, and I
have info on how that works.  As I said, I've heard conflicting
stories that it banks in and out in 4K segs like the SuperPET 9000 and
that it banks in and out in such a way that a lot of ROM can be
remapped to expanded RAM.  Which of the two is true is a mystery....
I can dig up the 4K info if there's interest in it.

>The speaker responds to a toggling of the "CB2" port in one of
>the interface chips.  The old (Pre 8032) PETS frequently had a
>small amplifyer and speaker connected to this pin to do sound
>tricks.  I hve programs SOMEWHERE to play music this way and
>they work on the 8032 film speaker.

Ah, it IS CB2.  I wasn't sure, all my PET refs are at home or loaned
out.  There are MANY programs that will work in this case.  The
Toronto PET Users Group (TPUG) would be a good resource, as always.

I also have a small board that connects to the user port and is
designed to generate much better music (it appears to be a primitive
D/A resistance network), but I've never used it.

>Sounds like there is a revival of interest in the PET lately.
>There have been a number of posts concerning the SuperPET on
>Comp.Sys.Amiga.Tech since Christmas.

By the way, Steve Punter's "BBS-PET" (pre BBS64) or whatever it was
called may still be available from somebody.  Whoever posted the
original request expressed an interest.
--
jgreco@csd4.milw.wisc.edu		Joe Greco at FidoNet 1:154/200
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