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Date: 1989-09 atari800xl.org comp.sys.atari.8bit
64K  
 
1.  Kent Covert  
 More options Sep 1 1989, 9:42 pm
Newsgroups: comp.sys.atari.8bit
From: KC95O@MIAMIU.BITNET (Kent Covert) -
Date: 1 Sep 89 12:42:41 GMT
Local: Fri, Sep 1 1989 9:42 pm
Subject: Re: 64K
| | | | | | |

     I'm not exactly sure how to do it, but there is a book out (I't may be
hard to find) called Mapping the Atari by Ian Chadwick (I think) that tells
a great deal about the Atari OS as well as listing most of the memory addresses
in the computer.  There is also a section telling some of the differences
between the old 800's and the XL's.  You might try giving this book a try.
     To tell you the truth though, it would probably be easier to just buy
an 800XL and not worry about it.  You can buy one for around $60 or less if
you look.  Or why not just upgrade to an ST?

                                           Good Luck,
                                           Kent Covert
                                           Miami University of Ohio


 
Syncing up to Network 8bits  
 
1.  Max W. Derhak  
 More options Sep 2 1989, 3:10 am
Newsgroups: comp.sys.atari.8bit
From: der@wasatch.utah.edu (Max W. Derhak) -
Date: 1 Sep 89 18:10:36 GMT
Local: Sat, Sep 2 1989 3:10 am
Subject: Syncing up to Network 8bits
| | | | | | |

In article <4@bbn.COM> slac@BBN.COM (Stan Lackey) writes:
>Does anyone know if the VBI is synchronized to the power line?  If so,
>one-bit-per-VBI is possible, even if the two ataris happen to be
>plugged into opposite phases.  It seems with some care, one BYTE per
>VBI might be possible (if the synchronization is there).

On the XL, XE's at least, the power suply generates DC voltage for the
computer, and therefore is in no way synced in with the power line.

Your best bet would be to use Pokey timer interupts.

Max


 
Cassettes  
 
1.  roger  
 More options Sep 2 1989, 9:12 am
Newsgroups: comp.sys.atari.8bit
From: r@tippy.uucp -
Date: 2 Sep 89 00:12:00 GMT
Subject: Re: Cassettes
| | | | | | |

I didn't give my complete address. It should have been:
tippy!ro@newton.physics.purdue.edu
Sorry about the mixup!


 
Anyone have a DEFENDER cartridge they wish to sell?  
 
1.  Gregory Bruno  
 More options Sep 2 1989, 11:46 pm
Newsgroups: comp.sys.atari.8bit
From: b@cupid.dec.com (Gregory Bruno) -
Date: 2 Sep 89 14:46:29 GMT
Local: Sat, Sep 2 1989 11:46 pm
Subject: Anyone have a DEFENDER cartridge they wish to sell?
| | | | | | |

     I brought my old 800 out of mothballs recently and have been playing some
of the game ROM cartridges I had put away with it.  The one that is missing
is DEFENDER.  Do any of you have this cartridge and are willing to sell it for
a reasonable price?

                                      Greg

********************************************************************************
Gregory Bruno |      Master of the           |    b@cupid.dec.com
              |      projectile              | or ...!decwrl!cupid.dec.com!bruno
              |      sweat-gland             | or bruno%cupid.@decwrl.dec.com
********************************************************************************


 
Atari 8-bit forth debugger  
 
1.  Bruce Peltzer  
 More options Sep 3 1989, 2:38 am
Newsgroups: comp.sys.atari.8bit
From: a@mindlink.UUCP (Bruce Peltzer) -
Date: 2 Sep 89 17:38:18 GMT
Local: Sun, Sep 3 1989 2:38 am
Subject: Re: Atari 8-bit forth debugger
| | | | | | |

> ttensfeldt writes:

> Msg-ID: <9@eagle.wesleyan.edu>
> Posted: 3 Sep 89 09:42:16 GMT

> In any case, he'd like to encourage FORTH activity among the ATARI
> 8-bitters so he's wants to give it away to anyone who wants a copy.

Is there a way that your friend could post it on the net? I know that there are
a few of us up here that would like to check it out. I'd also like to submit it
to the local Atari user group library (I am a director and 8 bit co-ordinator
for the Vantari User Group).

                 -bp-.

----------------------------------------------------------------
                   THIS SPACE FOR LEASE
----------------------------------------------------------------
uucp:  a@mindlink.UUCP             GEnie: b.peltzer2
----------------------------------------------------------------


 
 
2.  ttensfeldt  
 More options Sep 3 1989, 6:42 pm
Newsgroups: comp.sys.atari.8bit
From: ttensfe@eagle.wesleyan.edu -
Date: 3 Sep 89 09:42:16 GMT
Local: Sun, Sep 3 1989 6:42 pm
Subject: Atari 8-bit forth debugger
| | | | | | |
A friend of mine has written a screen oriented FORTH debugger for the
ATARI 8-bit computers. He tried to have it published by ANALOG
Computing, but the editors felt that it was too long, and would have
limited appeal. I guess they don't get enough FORTH articles submitted.

In any case, he'd like to encourage FORTH activity among the ATARI
8-bitters so he's wants to give it away to anyone who wants a copy. The
program features dynamic screen displays of the parameter stack, the
return stack and the last 10 execution steps.  It allows automatic or
manual single stepping of a program, decompiling a program step by
step, patching a program while it is executing, an escape feature that
lets you type regular FORTH commands while you are debugging, and a
bunch of other miscellaneous features. It does not interfere with the
user's screen so graphics oriented programs can be debugged.

The debugger is about 47 screens long, and takes up about 8K of RAM. It
has been tested using Patrick Mullarky's fig-FORTH, and val-FORTH, and
probably just about every other version of fig-FORTH. He believes that
most of it would run on any other computer that runs fig-FORTH, once
the screen display code was ported over.

My friend is willing to give away a copy as share-ware to anyone who
sends a stamped, self-addressed floppy mailer, and a blank 5 1/4 floppy
to:

        Nick Tamburri
        10 Oakhill Avenue
        Clinton, Massachusetts 01510

The returned floppy will contain the debugger, installation
instructions, and documentation in the form of the unpublished ANALOG
article. He doesn't have a modem so he can't post it on a bulletin
board somewhere but once it's distributed, anyone is free to post it.
===============================================================================
  Tom Tensfeldt           Bitnet: TENSFELDT%Eagle.WES@Wesleyan.Bitnet
                        Internet: TTENSFE@Eagle.Wesleyan.Edu or

                  4 Laurel Avenue, Ledyard,    CT 06339 (203)-464-9009
  Pfizer, Inc.,   Box 100,         Groton,     CT 06340 (203)-441-4835
  Chemistry Dept, Wesleyan Univ,   Middletown, CT       (203)-347-9411 X2635
===============================================================================


 
Mydos 4.51 wanted!  
 
1.  C.L. Freemesser  
 More options Sep 4 1989, 12:08 pm
Newsgroups: comp.sys.atari.8bit
From: clf3@ultb.UUCP (C.L. Freemesser) -
Date: 4 Sep 89 03:08:45 GMT
Local: Mon, Sep 4 1989 12:08 pm
Subject: Mydos 4.51 wanted!
| | | | | | |
Howdy all,

A little while ago, somebody posted both Mydos 4.51 and some sort of
source code for it (A-65 assembler?).  A friend of mine (actually
Bob Puff) has been looking for both, but hasn't found em.  Both
Bob and I would greatly appreciate it if somebody could post it here in
this newsgroup.

Chris Freemesser, Rochester Institute of Technology | What I like :
BITNET: %clf3678@RITVAX   GEnie: C.FREEMESSER       | 1) My Atari ST
USENET: Just reply and hope it gets through         | 2) My '77 Mercury
Call the ACORN BBS (716)436-3078, 300/1200 baud     | 3) Coke Classic


 
850 interfaces/modems for sale  
 
1.  C.L. Freemesser  
 More options Sep 4 1989, 12:22 pm
Newsgroups: comp.sys.atari.8bit, comp.sys.atari.st, misc.forsale
Followup-To: comp.sys.atari.8bit
From: clf3@ultb.UUCP (C.L. Freemesser) -
Date: 4 Sep 89 03:22:15 GMT
Local: Mon, Sep 4 1989 12:22 pm
Subject: 850 interfaces/modems for sale
| | | | | | |
I've come into a good sized quantity of both Atari 850 interfaces
and Avatex 1200 modems.

The interfaces are in like-new condition and fully tested by myself.
They come with the power supply, but no SIO or serial/parallel
cable.  Selling them for the miniscule price of $45 each!

The modems are partially Hayes compatible (all the important commands),
also in like-new condition and tested by myself.  The phone cable and
power supply comes with it.  I'm selling these for $40.

If you are interested, leave mail here, on BitNet, on GEnie, or on
my BBS.  If you leave mail here, I doubt I can reply to you (the
mail system here at RIT really bites it).  On the others, I can reply
with no problems.

Please add $5 shipping to each item's price.  I will ship them either
US Mail 1st Class, or UPS.  I prefer you send a check or money order
before I ship them out.

I also have a SMALL amount of modem cables for the interfaces.  The cost
is $8 plus $1 shipping.

Chris Freemesser, Rochester Institute of Technology | What I like :
BITNET: %clf3678@RITVAX   GEnie: C.FREEMESSER       | 1) My Atari ST
USENET: Just reply and hope it gets through         | 2) My '77 Mercury
Call the ACORN BBS (716)436-3078, 300/1200 baud     | 3) Coke Classic


 
Atari 800xl & drive for sale  
 
1.  David Hurtubise  
 More options Sep 4 1989, 10:58 pm
Newsgroups: comp.sys.atari.8bit, misc.forsale
From: d@ndmath.UUCP (David Hurtubise) -
Date: 4 Sep 89 13:58:12 GMT
Local: Mon, Sep 4 1989 10:58 pm
Subject: Atari 800xl & drive for sale
| | | | | | |

Sorry to have to post this again.  Our computer went down for a few days,
and all my mail got lost.  So, this time just contact George directly.

For Sale:

Atari 800xl
Percom single/double density disk drive
parallel printer inerface
various pieces of software

Price: $100 + $10 shipping

Contact:

George Rose
2428 Briargate
Bryan TX 77802
(409) 774 - 0175 (home)


 
Basic cart mod (switching it on/off w/o removal)  
 
1.  Robert Casey;6282;3.57;$0201  
 More options Sep 5 1989, 11:48 pm
Newsgroups: comp.sys.atari.8bit
From: r@briar.philips.com (Robert Casey;6282;3.57;$0201) -
Date: 5 Sep 89 14:48:40 GMT
Local: Tues, Sep 5 1989 11:48 pm
Subject: Basic cart mod (switching it on/off w/o removal)
| | | | | | |

BASIC CART MODIFICATION
Installing a switch on the cart so Basic can be
switched on or off without removing the cart

I own an Atari 800 and about half the time use the Basic cartridge.
Other times I use programs that require that the Basic cartridge be
removed.  This can cause a lot of wear and tear on the 800's
cartridge slot.  To avoid this, the cart can be modified so it can be
switched in or out.  I took apart my Basic cart, removing the shell.
I cut the circuit board trace connecting pins 13 and 14 on the
cartridge board (pin 14 is the source of memory map control signal
RD5).  I installed a very small (approx. half inch long, and
quarter inch tall from the bottom of the switch body to top of
slider) slide switch (SPDT) on the top edge of the board, center
contact soldered to the +5V trace (the fat trace at the top IC side
of the board).  The other contact is connected to pin 14.  This
connection is made as far from the bottom edge of the board as
possible so it can be pluged into the 800's cart slot without
jamming.  The metal housing of the switch should be connected to the
+5V trace to form a static drain (be sure it doesn't short to the
access door's metal shield; the metal shield could be removed if
necessary).  The cart board is inserted with the chips facing to
the back of the 800.
When I want to use Basic, I open
the access door and set the switch to "B".  When I need to remove
Basic, I turn the switch to "M", for machine code programs.  This
causes the circuits in the Atari 800 to switch away from the cart
and to the RAM at the same addresses.  The cart is effectively
removed.  I rarely use other carts, but if I want to, I can still
unplug the modified Basic cart.

       switch    mounts on the top edge of the board
_________________
I     +5 trace  I
I  ----   ----  I
I  IicI   IicI  I
I  I  I   I  I  I
I  I__I   I__I  I
I               I
I               I
  edge card conn.
  +5V-pin 13^ ^pin 14-RD5

     plug board into computer so that the ic's face
      the back of the computer


 

- - - -
End