Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.1 6/24/83; site inuxa.UUCP Path: utzoo!linus!philabs!cmcl2!seismo!hao!hplabs!tektronix!uw-beaver!cornell!vax135!houxm!ihnp4!inuxc!inuxa!tob From: tob@inuxa.UUCP (T Burger) Newsgroups: net.micro.atari Subject: XL parallel bus Message-ID: <299@inuxa.UUCP> Date: Thu, 11-Oct-84 16:21:02 EDT Article-I.D.: inuxa.299 Posted: Thu Oct 11 16:21:02 1984 Date-Received: Sat, 13-Oct-84 04:46:53 EDT Organization: AT&T Consumer Products Div., Indianapolis Lines: 57 The ATARI parallel bus pin-out. This information is from the 600XL Field Service Manual. ----------- GND | 1 2 | EXTERNAL SELECT A0 | 3 4 | A1 A2 | 5 6 | A3 A4 | 7 8 | A5 A6 | 9 10 | GND A7 | 11 12 | A8 A9 | 13 14 | A10 A11 | 15 16 | A12 A13 | 17 18 | A14 GND | 19 20 | A15 D0 | 21 22 | D1 D2 | 23 24 | D3 D4 | 25 26 | D5 D6 | 27 28 | D7 GND | 29 30 | GND PHASE 2 CLOCK OUTPUT | 31 32 | GND N/C | 33 34 | RESET OUTPUT IRQ | 35 36 | READY INPUT N/C | 37 38 | EXTERNAL DECODER OUTPUT N/C | 39 40 | REFRESH OUTPUT COLUMN ADDRESS OUTPUT | 41 42 | GND MATH PACK DISABLE INPUT | 43 44 | ROW ADDRESS STROBE OUTPUT GND | 45 46 | LATCHER READ/WRITE OUTPUT N/C | 47 48 | N/C AUDIO IN | 49 50 | GND ----------- To locate pin 1, while looking at the back of the unit, pin 1 is on the top right side. This is the only information I have. NO!! I don't know anymore about the use of the pins. NO! I don't know if the pinout is the EXACT same on the 800XL. This is the only page of the Field Service Manual I have. I recieved it from Atari on special request. Does anybody know any more about the bus?? I will post a summary of any replies I get. Ted O. Burger