Path: utzoo!attcan!uunet!lll-winken!ncis.llnl.gov!helios.ee.lbl.gov!pasteur!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: <502@csd4.milw.wisc.edu>
Date: 21 Jan 89 01:03:51 GMT
References: <2035@iitmax.IIT.EDU> <448@csd4.milw.wisc.edu> <2748@mibte.UUCP> <3549@utastro.UUCP> <5745@cbmvax.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Organization: UW-Milwaukee Home for Out-of-date 8 bit Hackers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: 40

In article <5745@cbmvax.UUCP> fred@cbmvax.UUCP (Fred Bowen) writes:
>The SuperPET bank switching is done through a register located at $EFFC,
>into which you place the bank number (0-15).  There are 16 4K RAM banks which
>which appear in memory at $9000-$9FFF.  There are other RAM and ROM expansion
>cartridges which appear at $A000.

The original question was re: 8096, not re: SuperPET....!

>The SuperPET has two built-in ACIA's, a 6551 at location $EFF0 and a 6850 at
								      ^^^^

>location $EFF4.  The 6551 is used for RS-232 I/O, the 6850 was simply a high
>speed serial line.  A standard RS232 connector is included.  I don't know of
>any IEEE-RS232 interfaces, but I do know IEEE-Centronics interfaces are still
>available.

Um, Fred, where?

Open wide, Betty.... opens SuperPET.  I don't see any 6850.  I do see
a 6551 and support circuitry.  I also don't see any 6850 in the
service / technical manuals (at least on the Super board itself).
Unless it's disguised on the 8032 motherboard, I still don't see any
6850.

Which brings up another question.  Is there ANY 6502 mode support for
the 6551?  I know it's not in ROM.... I've managed to get some
marginally useful SuperPET terminals (6809 and 6502) but they croak
when scrolling screen at 2400 or 9600 baud.

What I'd like to see is device drivers, Kernal style, to support it.
With a good input buffer, a good output buffer.... (is this starting
to sound like the Plus/4?)  Eventually I'd like to add an ACIA to one
of my 64's and be able to talk with my Courier 2400e at 9600 baud.

And stealing already written Kernal routines would be nice!  :-)
--
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