Zarxx Posted March 5, 2016 Share Posted March 5, 2016 I've just bought a used working 1050 in preparation for the new BitWriter mod. On opening it up for cleaning I found what looks like a repair. The shielding was installed as normal, the bottom of the board is untouched and it works fine otherwise. I do have the spare chips removed from my Mega Speedy install. Thoughts? Quote Link to comment Share on other sites More sharing options...
1050 Posted March 5, 2016 Share Posted March 5, 2016 It's a home rolled US Doubler upgrade. I'd keep the parts around myself as that is a fine one to have around. You'll find installation instructions for it in the SpartaDOS Construction Set Manual IIRC. Quote Link to comment Share on other sites More sharing options...
Zarxx Posted March 5, 2016 Author Share Posted March 5, 2016 (edited) It's a home rolled US Doubler upgrade. I'd keep the parts around myself as that is a fine one to have around. You'll find installation instructions for it in the SpartaDOS Construction Set Manual IIRC. Great, thanks. I thought U10 looked different too, both chips replaced according to the instructions. I'd heard of but never owned a USD, just some of the other mods which are the board type. So if I wanted to return it stock, just swap out the two? **Ah, just read about the jumpers and the chip types. Edited March 5, 2016 by Zarxx Quote Link to comment Share on other sites More sharing options...
Kyle22 Posted March 5, 2016 Share Posted March 5, 2016 It looks like that stack of 6810's is missing a wire. For comparison, to see one of mine, look here: http://atariage.com/forums/topic/220482-1050-us-doubler-speed/?do=findComment&comment=2901127 Quote Link to comment Share on other sites More sharing options...
Kyle22 Posted March 5, 2016 Share Posted March 5, 2016 (edited) Edit: Sorry, double post. Why does this happen? Edited March 5, 2016 by Kyle22 Quote Link to comment Share on other sites More sharing options...
_The Doctor__ Posted March 5, 2016 Share Posted March 5, 2016 I would keep this drive and make sure it's correct... I would buy or find another drive and add bit writer to that. Quote Link to comment Share on other sites More sharing options...
Mathy Posted March 5, 2016 Share Posted March 5, 2016 Hello Doc But who knows what he'll find in the next 1050. And the one after that... Sincerely Mathy Quote Link to comment Share on other sites More sharing options...
Zarxx Posted March 6, 2016 Author Share Posted March 6, 2016 It looks like that stack of 6810's is missing a wire. For comparison, to see one of mine, look here: http://atariage.com/forums/topic/220482-1050-us-doubler-speed/?do=findComment&comment=2901127 Interesting.. seems to work ok. I tested MyCopyR! with ultraskew enabled and it whizzed along. Quote Link to comment Share on other sites More sharing options...
1050 Posted March 6, 2016 Share Posted March 6, 2016 Interesting.. seems to work ok. I tested MyCopyR! with ultraskew enabled and it whizzed along. Don't worry too much about it, mines made like yours except pin 15 on top is tweaked over to pin 14 column so mine is even missing the 1/16 inch jumper you have, top pin 15 leg itself is the jumper. And I've noticed Kyle22's rigging before too and can only assume that they are equals somehow without actually understanding how. I do know that this ram is vigorously hammered from every possible angle looking for all valid shadow locations before the OS code allows the drive to even begin working - so his absolutely has to be just as good as ours. These are very stable and simply work great, everyone needs a doubler in their stack of drives. The author of this OS went on to write the Happy chip archiver code, I disremember his name at the moment but he is old school ICD legend. I remain totally impressed with that archiver code, Happy releases a 1050 drive mod that can boot a completely different OS into the drive from the boot disk and somebody else writes the only software that does it. Talk about being SERVED. Got their panties in a bunch right quick like and not peep out of them. I may have some details quite fuzzy there, rumors of rumors being what they are. Hello Mathy, I actually bought a Happy 1050 for $5 at the ARC second hand store once upon a time, talk about doing somersaults for days on end. And not a thing wrong with it too. Quote Link to comment Share on other sites More sharing options...
Kyle22 Posted March 6, 2016 Share Posted March 6, 2016 Just different ways of (ab)using the chip selects. As far as I know, I do it the way ICD originally did it. Quote Link to comment Share on other sites More sharing options...
BillC Posted March 6, 2016 Share Posted March 6, 2016 I looked at the 1050 schematic(and the 6810 datasheet) and top pin 14 should be able to be connected to any other active low chip select(pins 11/12/15)(Pins 10/13 are active high). Pin 10(CS0)(/A12) only affects the bottom 6810. Pin 13(CS3) of both is connected to the 6507(pin 28). Pin 14(A9) must select the active chip since /CS4(bottom) and CS0(top) aren't possible at the same time. The other 3 chip selects need to be active low for either/both chips. 1 Quote Link to comment Share on other sites More sharing options...
Fox-1 / mnx Posted March 10, 2016 Share Posted March 10, 2016 I disremember his name at the moment but he is old school ICD legend. Tom Harker? 1 Quote Link to comment Share on other sites More sharing options...
1050 Posted March 11, 2016 Share Posted March 11, 2016 Tom Harker was on my mind after I posted that but still not very sure due to foggy memory. So it's quite a coincidence you can come up with the same name where I really have no clue who worked at ICD otherwise. That sort of history holds little interest for me so retaining such information is a lost cause in most cases. Quote Link to comment Share on other sites More sharing options...
1050 Posted March 14, 2016 Share Posted March 14, 2016 Looks like a retraction is in order - I stumbled upon the post that gave me the idea that the chip and the USD were by the same guy. http://atariage.com/forums/topic/218319-why-single-density-and-then-whey-enhanced-density/page-3?do=findComment&comment=2863979 It's not Tom Harker, so why was I thinking it was after posting? Quote Link to comment Share on other sites More sharing options...
_The Doctor__ Posted March 16, 2016 Share Posted March 16, 2016 Yeah Mike Gustafson was the brains behind almost everything hardware ICD delivered..... Harker is a whole other story..... 2 Quote Link to comment Share on other sites More sharing options...
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