Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: utzoo!utgpu!water!watmath!clyde!rutgers!ucla-cs!zen!ucbvax!WALKER-EMH.ARPA!InfoMail-Mailer From: InfoMail-Mailer@WALKER-EMH.ARPA.UUCP Newsgroups: comp.sys.atari.8bit Subject: Undeliverable Mail Message-ID: <8709132206.AA12439@ucbvax.Berkeley.EDU> Date: Sun, 13-Sep-87 17:15:00 EDT Article-I.D.: ucbvax.8709132206.AA12439 Posted: Sun Sep 13 17:15:00 1987 Date-Received: Tue, 15-Sep-87 01:32:03 EDT Sender: daemon@ucbvax.BERKELEY.EDU Distribution: world Organization: The ARPA Internet Lines: 152 Mail was not delivered to the following users because there were bad address(es) in TO and/or CC field(s): info-atari UNDELIVERED-MESSAGE: ---------------------------------------------------------------- Received: from BBN.COM by WALKER-EMH.ARPA ; 12 Sep 87 07:06:41 GMT Received-2: from score.stanford.edu by BBN.COM id aa02738; 12 Sep 87 3:03 EDT Date: Fri 11 Sep 87 22:44:03 PDT Subject: Info-Atari8 Digest V87 #80 From: Info-Atari8 @ SCORE.STANFORD.EDU Errors-to: Info-Atari8-request@Score.Stanford.EDU Maint-Path: Info-Atari8-request@Score.Stanford.EDU To: Info-Atari8 Distribution List: Reply-to: Info-Atari8@SCORE.STANFORD.EDU Text: Info-Atari8 Digest Friday, September 11, 1987 Volume 87 : Issue 80 This weeks Editor: Bill Westfield Today's Topics: Custom 6502 File Format of Re: File Format of Re: 600XL Upgrade to 256k ? Where and How? custom 6502 ---------------------------------------------------------------------- Date: Thu, 10 Sep 87 11:17 EDT From: Cothrell@DOCKMASTER.ARPA Subject: Custom 6502 To: info-atari8@SCORE.STANFORD.EDU jwt at Atari has written me a note stating that the CPU in the later Atari computers (everything but the 800/400 I guess) is indeed custom. The difference seems to be that the custom chip has the ability to tri-state its 'bus'. I have asked for clarification of its 'bus', but I think that he means the address bus (at least) and possibly more. Apparently the old 800's had the tri-state logic external to the 6502. Ed Satterthwaite raised the point of the "worthwhileness" of attempting to replace the cpu in the atari computers. I agree that most of his points are logical and reasonable. That doesn't change my mind, I just happen to agree with him. (I am a hacker at heart and sanity has never been a prerequisite) I happen to have the 800 schematics which show the tri-state logic (if you want to call it that...weirdest contraption I ever saw...anyone know the reasoning behind that design??? I though one used the 650X because the phased clocks were generated for you!) and am going to try to make a "processor module" that will drop into the custom 6502 socket and properly tri-state things. wish me luck (I'll probably need it) Scott Cothrell Cothrell -at Dockmaster.arpa ------------------------------ Date: Thu, 10 Sep 87 11:32 EDT From: Cothrell@DOCKMASTER.ARPA Subject: File Format of To: info-atari8@SCORE.STANFORD.EDU this is for BW I guess... what do the different extenders on the files under stand for and which ones differentiate between 16 and 8 bitter programs? ------------------------------ Mail-From: BILLW created at 10-Sep-87 09:31:22 Date: Thu 10 Sep 87 09:31:22-PDT From: William "Chops" Westfield Subject: Re: File Format of To: Cothrell@DOCKMASTER.ARPA In-Reply-To: <870910153256.454558@DOCKMASTER.ARPA> Unfortunately, there is nothing to differentiate between 8 bit and 16 bit programs in . Almost all files are in there original mail-message format, and must be cut, pasted, uudecoded, and de-arced by hand. *.N* are files that have been received but never sent out to the net. Other files are older and may have been sent in some number of pieces soon after there original postings. Some files contain multiple versions of the same program, some files have peices missing. I may actually get araound to distributing atari8 programs to the net via mail, but the volume of normal mail (and the size of programs) for the atari16 list makes this completely impossible. BillW ------------------------------ Date: 9 Sep 87 18:22:04 GMT From: fluke!ssc-vax!bcsaic!ray@beaver.cs.washington.edu (Ray Allis) Subject: Re: 600XL Upgrade to 256k ? Where and How? To: info-atari8@score.stanford.edu In article <14540@watmath.waterloo.edu> hpchang@watmath.UUCP (KILROY) writes: > > > I would like to ask for your help in finding a way to upgrade the Atari > 600xl to 256k. I would appreciate any help on this... > Thanks in advance..... Best Electronics advertises in the Puget Sound Atari Newsletter a kit with instructions for a do-it-yourself upgrade to your 600xl. They are: Best Electronics 2021 The Alameda Suite 290 San Jose, CA. 95126 (408)243-6950 They have a 64k upgrade for $15, and for $28 you can get a 256k mod which was designed by Jeff Popp in Redmond Wash. American Techna-vision, at 1-800-551-9995, has a 64k plug-in module for 29.95, but they didn't sound very encouraging about 256k. -- CSNET: ray@boeing.com UUCP: uw-june!bcsaic!ray ------------------------------ Date: Fri, 11 Sep 87 19:42 EDT From: Cothrell@DOCKMASTER.ARPA Subject: custom 6502 To: atari!jwt@AMES.ARPA I assume that the custom 6502 tri-states its address bus when the Antic puts pin 9 (HALT) low. I think I have further deduced that pin 35 of the 6502 is the trigger for the tri-stating. two questions. am I right so far, and is the data bus also tri-stated? thanx, Scott Cothrell Cothrell at Dockmaster.arpa ------------------------------ End of Info-Atari8 Digest ************************** ------- -------------------END OF UNDELIVERED MESSAGE-------------------