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1.
Kent Covert
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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
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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
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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
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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
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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
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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
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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?
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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
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projectile | or
...!decwrl!cupid.dec.com!bruno
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> 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
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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
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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
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
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
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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)
Subject: Basic cart mod (switching it on/off w/o removal)
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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