sloopy Posted March 4, 2012 Share Posted March 4, 2012 Nice video, but the 4464's are 150, not 15ns... And show the resistor, the resistor has to be pulled out from the hole... sloopy. Quote Link to comment Share on other sites More sharing options...
linuxfanman Posted March 4, 2012 Share Posted March 4, 2012 (edited) Nice video, but the 4464's are 150, not 15ns... And show the resistor, the resistor has to be pulled out from the hole... sloopy. Hey sloopy, The 15ns thing was a slip of the tongue, but I covered for it in the videos description specifying what chip is needed. I realized that I didn't show the resistor very well while I was editing the video two days later. I told myself the same thing, "I should of shown that resistor better". Also I think I figured out what pin 8 of U16 is used for in the circuit after filming. I believe it controls the Column Address Strobe (CAS) of the 4464's. Pulling R36 up and attaching pin 8 of U16 allows the memory to access more columns without requiring the presence of A14 and A15 through U15c's Gate, thus being able to read all 64k. But I could be wrong. Does that seem correct? I'm far from being an engineer. Linuxfanman Edited March 4, 2012 by linuxfanman 1 Quote Link to comment Share on other sites More sharing options...
flashjazzcat Posted November 26, 2012 Share Posted November 26, 2012 I've done this mod to a Rev A 600XL without issue, but I have two Rev B boards which simply refuse to boot after this mod is done. I thought the first Rev B failure was a one-off, but now I've encountered a second which won't work. The latest one jumps straight into the memory test if option is held down, otherwise it just hangs. The same RAMs work in a Rev A board, and the RAMs from the Rev A board still result in a hanging Rev B machine. I'm pretty much at a loss... Quote Link to comment Share on other sites More sharing options...
sloopy Posted November 26, 2012 Share Posted November 26, 2012 FJC, I dont rem how the video shows the mod, I know the how-to i posted has worked in every machine I have put it in, and that is 20+ of them... sloopy. Quote Link to comment Share on other sites More sharing options...
flashjazzcat Posted November 26, 2012 Share Posted November 26, 2012 (edited) FJC, I dont rem how the video shows the mod, I know the how-to i posted has worked in every machine I have put it in, and that is 20+ of them... Well, my first port of call is always human error (heh), so I've qaudruple-checked to make sure I've done the same mods to all the machines. I have no doubts about the accuracy of your how-to instructions, and if the same mod works on 20 plus machines, we can assume a good proportion of them had Rev B boards, so that means I've ballsed up somewhere or I have two duff Rev B boards. Edited November 26, 2012 by flashjazzcat Quote Link to comment Share on other sites More sharing options...
flashjazzcat Posted November 27, 2012 Share Posted November 27, 2012 Resolved. Human error... 1 Quote Link to comment Share on other sites More sharing options...
Jinks Posted January 12, 2013 Share Posted January 12, 2013 (edited) Anyone have a clue or can sell me these chips... I spent 39.00 on d4464c-15l and they are too big. I followed the vid and had everything ready and got to the motherboard and said Crap..oh well maybe in feb have this thing up and running 64k... Edited January 12, 2013 by Jinks Quote Link to comment Share on other sites More sharing options...
Jinks Posted January 12, 2013 Share Posted January 12, 2013 Can you cut the resistor end out of the board and what type of wire is best... Quote Link to comment Share on other sites More sharing options...
BillC Posted January 12, 2013 Share Posted January 12, 2013 Anyone have a clue or can sell me these chips... I spent 39.00 on d4464c-15l and they are too big. I followed the vid and had everything ready and got to the motherboard and said Crap..oh well maybe in feb have this thing up and running 64k... What you purchased are 8k-byte static RAM chips, what you need are 64k x 4 bit (18 pin) Dynamic RAM chips like the ones in the link below: eBay Auction -- Item Number: 261078481809 Quote Link to comment Share on other sites More sharing options...
Jinks Posted January 12, 2013 Share Posted January 12, 2013 (edited) Hell those are cheap!!! They are the right ones?? For sure?? Does ne one need these pricey chips I bought they will go in garbage.. Too bad I didnt know this before and thanks for the link!! I will order a couple and try AGAIN!! Edited January 12, 2013 by Jinks Quote Link to comment Share on other sites More sharing options...
Jinks Posted January 12, 2013 Share Posted January 12, 2013 There ordered at 10 bucks shipped!! Great deal thanks for the link!! Quote Link to comment Share on other sites More sharing options...
BillC Posted January 12, 2013 Share Posted January 12, 2013 Hell those are cheap!!! They are the right ones?? For sure?? Does ne one need these pricey chips I bought they will go in garbage.. Too bad I didnt know this before and thanks for the link!! I will order a couple and try AGAIN!! They are slightly faster than the stock chips, 100ns vs 150ns, but I believe they should work just fine. Quote Link to comment Share on other sites More sharing options...
Defender II Posted January 23, 2013 Share Posted January 23, 2013 (edited) I did this drawing for my kit... http://morethangames.../adv-ek0042.htm Your link is dead. I was thinking of buying an XL model for the top cart slot and was leaning towards the 800XL because it has 64K. But if the upgrade is that easy and the 600XL is smaller I might go for it. I went for the 600XL and got a RAM 320XL PBI memory upgrade from ctirad Edited January 23, 2013 by Defender II Quote Link to comment Share on other sites More sharing options...
Jinks Posted January 27, 2013 Share Posted January 27, 2013 Ok anyone got logic chips?? For u5 u 6?? Note do not bend the pins at all at the chip end.. will break off.. oh well maybe by april will have it done.. also no one has answered my question as do you cut the resistor out?? Like disconnect one end??? Quote Link to comment Share on other sites More sharing options...
Jinks Posted January 27, 2013 Share Posted January 27, 2013 Would these chips work on the 600xl for logic? eBay Auction -- Item Number: 230407022595 Quote Link to comment Share on other sites More sharing options...
Jinks Posted January 27, 2013 Share Posted January 27, 2013 Ok I think I get it you cut the resistor out of the board on one end and solder. If those are the chips I need I will order the lot of 50 to prevent another two weeks of delay Quote Link to comment Share on other sites More sharing options...
santosp Posted February 7, 2013 Share Posted February 7, 2013 (edited) I hope this photo above to help you somehow. If you bend the pins carefully not broken. You need 2 x 74LS158? I have plenty on store here, and I can send you. With simple post will take about 8-10 days to arrive to you. Edited February 7, 2013 by santosp Quote Link to comment Share on other sites More sharing options...
Jinks Posted February 9, 2013 Share Posted February 9, 2013 So I got my logic chips. Soldered the connections used a mini phaser to lower the temp just right. Would have been nice to know about the wire has to be solid wire to fit in the board. Its easy as hell tho and works great.. Quote Link to comment Share on other sites More sharing options...
atari8warez Posted February 10, 2013 Share Posted February 10, 2013 (edited) I just finished upgrading mine a few days ago. No need to bend the legs much, just a bit is enough. S-video was added since, next is U1MB and then a built-in SIO2PC and this machine becomes my daily use Atari 8 bit. Edited February 10, 2013 by atari8warez Quote Link to comment Share on other sites More sharing options...
Jinks Posted February 10, 2013 Share Posted February 10, 2013 I think i want vbxe2. u1mb and side2 .. They are cool machines. I got 3 logic chips left if i ever have issues..all 600xl's should have this mod done.. Quote Link to comment Share on other sites More sharing options...
tjlazer Posted September 3, 2013 Share Posted September 3, 2013 (edited) Just performed the KEN SUMRALL 64k RAM mod on a PAL 600XL. But I used the lower connection points on mine like the other mod. HOW TO UPGRADE YOUR ATARI 600XL TO 64K RAM THIS MOD IS COPYRIGHTED BY KEN SUMRALL. HOWEVER, YOU MAY FREELY DISTRIBUTE IT, AND MODIFY IT, AS LONG AS THIS NOTICE IS INCLUDED IN ITS ENTIRERTY. THE AUTHOR MAY BE REACHED AT THE FOLLOWING EMAIL ADDRESSES: ken%hpda@hplabs.hp.com ...!hplabs!hpda!ken You will need the follow parts to perform this mod: (2) 4464 RAM chip, 64Kx4, 150ns or faster. Additionally, you will need chip pullers, a soldering iron, and 3 small pieces of wire. I used wire wrap wire when I did this mod. If the chips on your 600XL are socketed, you're in luck, otherwise, you need to first unsolder the following chips: (1) 74S32 location U18 (2) 74LS158 locations U5 and U6 (2) 4416 locations U11 and U12 and put sockets on the mother board in their place to make the job easier. Now bend up pin 9 on the 74S32, and put it back in its socket on the mother board. Bend up pin 3 on the 74LS158 in location U5, and put it back in its socket. Also, bend up pin 10 on the 74LS158 in location U6, and put that chip back into its socket. The last two chips you need to change are the two RAM chips. Put the 4464 chips into the sockets at locations U11 and U12 on the motherboard. Now you need to install 3 wires to complete the mod. The first wire should be connected between pin 3 of the 74LS158 at location U5, and pin 20 of the parallel bus on the 600XL. The second wire should be connected between pin 10 of the 74LS158 at location U6, and pin 18 of the parallel bus. The third wire connects between pin 9 of the 74S32 at location U18, and pin 45 on the parallel bus. That's all there is to it. Edited September 3, 2013 by tjlazer Quote Link to comment Share on other sites More sharing options...
atari8warez Posted September 5, 2013 Share Posted September 5, 2013 (edited) I've upgraded my 600XL about 6 months ago (according to my own post a few msgs back) and never had a chance to ask this question. What I noticed after the upgrade that my 600XL needs quite a few seconds between ON-OFF cycles. If I turn it OFF and turn it back ON immediately most of the times it simply drops immediately back to the BASIC screen instead of cold starting. My suspicion is that the RAM is not properly cleared if the OFF time is too short. Is this something you guys also noticed after the upgrade or is it just my machine? Is there a way to fix that? Edited September 5, 2013 by atari8warez Quote Link to comment Share on other sites More sharing options...
+Guitarman Posted September 5, 2013 Share Posted September 5, 2013 It is probably the case since this is how the 800XL with a 256K Rambo reacts if it isn't allowed to set a few moments after powering off. I would assume that since it is a set of 64x4 chips, they will take longer to clear than the 64x1 chips in a stock 800XL. I've upgraded my 600XL about 6 months ago (according to my own post a few msgs back) and never had a chance to ask this question. What I noticed after the upgrade that my 600XL needs quite a few seconds between ON-OFF cycles. If I turn it OFF and turn it back ON immediately most of the times it simply drops immediately back to the BASIC screen instead of cold starting. My suspicion is that the RAM is not properly cleared if the OFF time is too short. Is this something you guys also noticed after the upgrade or is it just my machine? Is there a way to fix that? Quote Link to comment Share on other sites More sharing options...
rockdoc2010 Posted April 21, 2014 Share Posted April 21, 2014 Well it didn't work the first attempt. I completed the MOD and got a BLACK SCREEN it turns out and I was sure that it might be the problem I destroyed the memory chips that I removed from a XEGS board. Thank god that I buy spare chips.. I always buy extra chips and I had a different project with extra chips.. SO the memory chips that I bought from JAMECO and the extra controller chips and VOILLA!! Works good last a long time!! Douglas Quote Link to comment Share on other sites More sharing options...
rockdoc2010 Posted January 24, 2015 Share Posted January 24, 2015 not so long time... turns out i had one unit that developed really bad video, so i moved the upgrade over to another unit.. worked good for about three boots black screen i am running out of 600xl machines! this mod cant be that devestating as everyone seems to be able to do it. i cant tell if its the delay line or the memory chips?! i have two good 16k units and i am not wanting to kill another unit to determine why one of the upgraded units failed. whats causing theses black screens after mods? Quote Link to comment Share on other sites More sharing options...
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