dely Posted July 9 Share Posted July 9 What does the RS232 connector pinout look like? Is it compatible with the 850, or perhaps current standards known from PCs? Quote Link to comment Share on other sites More sharing options...
reifsnyderb Posted July 9 Share Posted July 9 (edited) 1 hour ago, dely said: What does the RS232 connector pinout look like? Is it compatible with the 850, or perhaps current standards known from PCs? I am reviewing that right now. It appears that something is wrong with the pinouts as the schematic shows pin 1 as DTR when I believe pin 1 should be DCD. So, I am trying to figure this out before getting the boards made. Pins 2 and 4 don't match the standards, either. Update: I think I found the problem and it should now be fixed. 2nd Update: I've now determined that mystery 26 pin header, on the left side of the card, is the 2nd RS232 port. A picture shows what looks like wire wrap on that header. It turns out it's configured to loop back. 🙂 So, the most likely configuration was as follows: P: DB25 connector R1: DB9 connector R2: 26 pin header Edited July 9 by reifsnyderb Quote Link to comment Share on other sites More sharing options...
reifsnyderb Posted July 9 Share Posted July 9 1090XL Parallel/Serial boards are ordered for testing. 🙂 6 Quote Link to comment Share on other sites More sharing options...
reifsnyderb Posted July 9 Share Posted July 9 (edited) After a question about the serial port wiring, on FaceBook, I did some more searching. The DB-9 connector was originally wired as per the Atari 850's pinout. I changed it to an RS-232 pinout as I mistakenly thought the schematic was mistaken. I wasn't aware that Atari used a slightly different pinout on the serial ports. I hope I didn't make a mistake by changing the wiring to the RS-232 standard. On the other hand, maybe it will be more compatible with available devices? Edited July 9 by reifsnyderb 4 Quote Link to comment Share on other sites More sharing options...
dely Posted July 9 Share Posted July 9 Very good choice. You have saved a lot of people from soldering special cables just for this card 1 1 Quote Link to comment Share on other sites More sharing options...
+kheller2 Posted July 9 Share Posted July 9 6 hours ago, reifsnyderb said: 1090XL Parallel/Serial boards are ordered for testing. 🙂 Is there a driver for this? I can't remember if a prototype one leaked out. 1 Quote Link to comment Share on other sites More sharing options...
reifsnyderb Posted July 9 Share Posted July 9 (edited) 7 minutes ago, kheller2 said: Is there a driver for this? I can't remember if a prototype one leaked out. Yes. There was some ROM uploaded to the Atari Museum at one time. I have the code. It is partially disassembled and, thus far, appears to be correct. The PLD code is missing. However, with the information available I think I've mostly re-created it. Once I have the boards, I'll finish the re-creation of the PLD code. Edited July 9 by reifsnyderb 1 Quote Link to comment Share on other sites More sharing options...
Mathy Posted July 9 Share Posted July 9 Hello Bryan 5 hours ago, reifsnyderb said: I hope I didn't make a mistake by changing the wiring to the RS-232 standard. On the other hand, maybe it will be more compatible with available devices? Would it be an option to make this selectable, via some sort of switch? Or via a couple of wires and some jumper pins? Sincerely Mathy PS apparently, Atari brought out the 850 before the RS232 standard was finalized. That's why the pin out they used was different, I was told. Quote Link to comment Share on other sites More sharing options...
reifsnyderb Posted July 9 Share Posted July 9 20 minutes ago, Mathy said: Hello Bryan Would it be an option to make this selectable, via some sort of switch? Or via a couple of wires and some jumper pins? Sincerely Mathy PS apparently, Atari brought out the 850 before the RS232 standard was finalized. That's why the pin out they used was different, I was told. Hello, Well, I figured out that long J3 header, on the left side of the board, is the 2nd RS232 port. So, you could connect it however you want and connect it to either a DB25 or DB9 connector. I suppose, if this all works out, the long term solution would be to have a more advanced parallel/serial card. But there would have to be a decent amount of interest. Best Regards, Brian 5 Quote Link to comment Share on other sites More sharing options...
reifsnyderb Posted July 10 Share Posted July 10 Current, partial disassembly of the serial/parallel card ROM: 1090-ParaSerial-2716_crc-1bdb5_d2.asm 1 Quote Link to comment Share on other sites More sharing options...
reifsnyderb Posted July 10 Share Posted July 10 New, partial disassembly of serial/parallel card ROM: 1090-ParaSerial-2716_crc-1bdb5_d3.asm 1 Quote Link to comment Share on other sites More sharing options...
Forrest Posted July 10 Share Posted July 10 There’s an interesting story behind the 2nd-4th serial ports on the Atari 850 - they were designed to communicate with model railroad switches! 3 Quote Link to comment Share on other sites More sharing options...
reifsnyderb Posted July 10 Share Posted July 10 11 minutes ago, Forrest said: There’s an interesting story behind the 2nd-4th serial ports on the Atari 850 - they were designed to communicate with model railroad switches! I read the story somewhere. This card has 2 serial ports and one parallel port. Each serial port has it's own 6551. I think this card has full RS232 support. 3 Quote Link to comment Share on other sites More sharing options...
reifsnyderb Posted July 10 Share Posted July 10 Firmware specifications for the parallel/serial card: SPC_firmware_specifications-30MAY84.pdf 5 Quote Link to comment Share on other sites More sharing options...
reifsnyderb Posted July 16 Share Posted July 16 Serial/Parallel card re-make: Waiting on parts.... 9 Quote Link to comment Share on other sites More sharing options...
Geister Posted July 17 Share Posted July 17 Where's the prototyping card and the serial card on ebay or tindie? What does it cost to populate that Apple II motherboard on your ebay store? Quote Link to comment Share on other sites More sharing options...
reifsnyderb Posted July 17 Share Posted July 17 (edited) 18 minutes ago, Geister said: Where's the prototyping card and the serial card on ebay or tindie? What does it cost to populate that Apple II motherboard on your ebay store? I have the prototyping board here: https://www.tindie.com/products/5cfab/prototyping-board-for-the-atari-1090xl/ I have no idea what it costs to populate the Apple II board. I was thinking about building one but didn't get around to it. Many of the chips either need to be donated from an Apple II Plus and/or rounded up used as they are no longer available. I do have a project to build an Apple II Plus type board, that takes modern chips, but haven't gotten back to it. Edited July 17 by reifsnyderb Quote Link to comment Share on other sites More sharing options...
Geister Posted July 17 Share Posted July 17 I've been thinking about getting an Apple II but never find one for sale locally. I might want to build one up from scratch. Quote Link to comment Share on other sites More sharing options...
+DavidMil2 Posted July 17 Share Posted July 17 On 7/8/2024 at 5:18 AM, TwiliteZoner said: stay safe David. Thank you TwiliteZoner. After eight and half days without any electricity, phones, or internet; things are back to normal. Our whole house Genrac generator quit on the first day. My wife says (on her IPad) that there are dozens of other Generac owners that are complaining about the same thing. When I finally got through to Generac (all the local towers were out for three days), they said to call our local Generac authorized dealer for warranty work. Of course, all the phones are dead so that took another two days. When I finally got through to the company, they said that they had over 400 calls before me and that it would take a week or more before they could get to mine. As far as damage went; none to the house, but we had a large branch (about 6" in dia.) from a tree in the back yard break off. It is really a sight to see tall trees being whipped around buy 90 mph (145 kpm) winds. Well, now starts the cleanup. DavidMil2 1 Quote Link to comment Share on other sites More sharing options...
+Stephen Posted July 17 Share Posted July 17 Wow - sorry to hear that. I'm surprised to hear about the generator issues - I thought that brand was nearly indestructible. My neighbours has one. If you don't mind me asking, what was the issue? Quote Link to comment Share on other sites More sharing options...
+DavidMil2 Posted July 20 Share Posted July 20 On 7/17/2024 at 3:54 PM, Stephen said: Wow - sorry to hear that. I'm surprised to hear about the generator issues - I thought that brand was nearly indestructible. My neighbours has one. If you don't mind me asking, what was the issue? Not sure yet. (Sorry for the slow response: we were a victim of the software glitch, so the internet and phones went down 15 minutes after I posted the previous message. Both just came up about an hour ago). It seems to be something in inside the Generac. It will start, but it sounds and feels/looks (engine is shacking on the motor mounts) like it's missing on one cylinder and after a few seconds you can smell natural gas. So I shut off the gas and I'm waiting... Here is a picture of the front metal where I had to stop. DavidMil2 3 Quote Link to comment Share on other sites More sharing options...
+DavidMil2 Posted July 20 Share Posted July 20 I see the ground on J7 but what is the purpose of the other three connectors? DavidMil2 Quote Link to comment Share on other sites More sharing options...
kenames99 Posted July 20 Author Share Posted July 20 hi David, I am looking at the picture you posted just above and see it has too many ICs installed! only 1 of those on the right side of that photo should be installed. the other is an optional IC if you prefer a different driver IC. please remove one or the other. the same is true of the other ICs on the other side of the board, there is optional , well, options. use either the 74LS244 drivers or the 74LS541 drivers but not both! I have attached a photo of my working 1090XL for reference. Ken PS: hope everything returns to normal there in a reasonable timeframe. Quote Link to comment Share on other sites More sharing options...
reifsnyderb Posted July 20 Share Posted July 20 It was for a remote power switch and remote LED. A switch could go between pins 1 and 2. A power LED, and resistor would go between pins 3 and 4. I added it as an idea and removed it in newer versions. Quote Link to comment Share on other sites More sharing options...
reifsnyderb Posted July 20 Share Posted July 20 (edited) 55 minutes ago, DavidMil2 said: Not sure yet. (Sorry for the slow response: we were a victim of the software glitch, so the internet and phones went down 15 minutes after I posted the previous message. Both just came up about an hour ago). It seems to be something in inside the Generac. It will start, but it sounds and feels/looks (engine is shacking on the motor mounts) like it's missing on one cylinder and after a few seconds you can smell natural gas. So I shut off the gas and I'm waiting... Here is a picture of the front metal where I had to stop. DavidMil2 Good catch, @kenames99! I didn't look that carefully and was just looking at the case. Yes, there are too many IC's in there. If you have just the IC's closest to the slots, it should work.....assuming the PLD is properly programmed. Edited July 20 by reifsnyderb Quote Link to comment Share on other sites More sharing options...
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