Fox-1 / mnx Posted May 5, 2012 Share Posted May 5, 2012 After many years I finally modded my main 1050 to let it run on an "AT" power supply. I mounted 2 PC-style 4-pin molex connectors in the back of the case so I can daisy-chain the power to other 1050's (not modded yet). When at it I also redid all the ugly wiring (Speedy switches, write protect, etc) and removed the external speed potmeter since I don't use it anymore these days. Seems to work as it should on both AC and DC but when DC powered the on/off switch doesn't work anymore (which is as expected). The only time I need to power it off is when programming the Speedy to disable itself. After that, the only way to re-enable it (reset) is to power off/on. Once I had a doc to add a RESET button to the Atari 1050 but can't find it anymore. The button was meant for stock 1050's and I don't know if it also works on Speedy upgraded 1050's. Anyone have this doc? Or maybe other ways to do a RESET with a button? Quote Link to comment Share on other sites More sharing options...
31336haxx0r Posted May 5, 2012 Share Posted May 5, 2012 I may be as simple as a button connected to the 6502 reset line. Quote Link to comment Share on other sites More sharing options...
Fox-1 / mnx Posted May 5, 2012 Author Share Posted May 5, 2012 I may be as simple as a button connected to the 6502 reset line. Changes are it may be as simple as that. I'm not sure if I can just tie it to ground without nasty side effects. Quote Link to comment Share on other sites More sharing options...
31336haxx0r Posted May 5, 2012 Share Posted May 5, 2012 Is there a 1050 schematic around we could get a quick look at? Quote Link to comment Share on other sites More sharing options...
31336haxx0r Posted May 5, 2012 Share Posted May 5, 2012 Look at this: http://nuxx.net/gallery/d/52293-1/atari1050_schematic.png Seems like a 555 IC is used to provide the reset signal. I can't remember the 555 circuit stuff anymore, but I think a button that shorts out C32 when pressed could do the trick here. Quote Link to comment Share on other sites More sharing options...
Fox-1 / mnx Posted May 6, 2012 Author Share Posted May 6, 2012 After asking around on irc it seemed to be safe to tie /RST of a running 6502 to ground. At the meanwhile it's tested and up and running. Works like a charm. 1 Quote Link to comment Share on other sites More sharing options...
31336haxx0r Posted May 6, 2012 Share Posted May 6, 2012 So you made the switch tie the /RST line directly to ground? Sounds like a bad idea. Not because the 6502 couldn't handle it (it was buildt to do so), but all that other circuitry involved. Quote Link to comment Share on other sites More sharing options...
+Larry Posted May 6, 2012 Share Posted May 6, 2012 I think that I have an article that includes the Reset. I'll take a look. It was published (IIRC) in M.A.M. (Michigan Atari Magazine). It included drive number select and reset. -Larry Quote Link to comment Share on other sites More sharing options...
+Larry Posted May 6, 2012 Share Posted May 6, 2012 Here is the one that I remembered. It was from a user group newsletter, not MAM. I've done the drive select portion, but never tried the Reset. (.TXT and .DOC formats included.) -Larry Atari Drive Select and Reset.zip Quote Link to comment Share on other sites More sharing options...
Fox-1 / mnx Posted May 6, 2012 Author Share Posted May 6, 2012 (edited) So you made the switch tie the /RST line directly to ground? Only when the button is pushed of course. Wanted to add a resistor but even going as low as 180 Ohm didn't activate it so now it's directly tied to ground. Here is the one that I remembered. It was from a user group newsletter, not MAM. I've done the drive select portion, but never tried the Reset. (.TXT and .DOC formats included.) Thanx for the doc. I think this is the one I actually mentioned in the 1st post. Now that I reread it I think using the 555 isn't necessary (or won't do) for a Speedy drive. A stock 1050 has a 6507 which is replaced by a 6502 when installing a Speedy upgrade. Both CPU's are software compatible but maybe there are slight differences in things like /RST. Don't know, just a guess. Drive select... I put a switch on the front to replace one of the PCB switches to be able to switch between D1: and D2: , or (D3: D4:, depending on the position of the other switch). This will be replaced by a BCD-like rotary switch to be able to select all numbers. This may introduce some issues with the power-LED as I exchanged it for a bi-color one that lights up Green or Red when selecting D1: or D2: :-) Edited May 6, 2012 by Fox-1 / mnx Quote Link to comment Share on other sites More sharing options...
+Larry Posted May 6, 2012 Share Posted May 6, 2012 When you get your mods done, please do post some pics and what you ended up doing. Sounds interesting. -Larry Quote Link to comment Share on other sites More sharing options...
+Nezgar Posted November 15, 2017 Share Posted November 15, 2017 Sorry for the 5 year Necropost, but I just did the 555 reset mod to my Happy 1050 and it works great! Very nice for getting the drive out of a stooper after reading bad disks, or undoing custom uploaded code..,. or in this drive's particular case, switchable between Happy and Stock 1050 OS ROM's which i can now do without powering off by holding the reset down while switching. Same mod shown on Steve Carden's site: http://www.realdos.net/Drive%20Reset.html Button on side of drive, as I reused a hole that was already there from a prior mod that I tucked away inside... 4 Quote Link to comment Share on other sites More sharing options...
+Larry Posted November 15, 2017 Share Posted November 15, 2017 Nice, useful update. Good photos -- may have to add one to mine! -Larry Quote Link to comment Share on other sites More sharing options...
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