Clint Thompson Posted April 7, 2005 Share Posted April 7, 2005 Will this expand the ram to 128k? or is it for use with the 600XL only? Quote Link to comment Share on other sites More sharing options...
doncleth Posted April 7, 2005 Share Posted April 7, 2005 Will this expand the ram to 128k? or is it for use with the 600XL only? Wow, it'll be interesting to see if this works. The 1064 adds 48k to the 600XL's 16K to make it 64K. So if this does work then that would make the 800XL have 112K. Quote Link to comment Share on other sites More sharing options...
Clint Thompson Posted April 7, 2005 Author Share Posted April 7, 2005 Will this expand the ram to 128k? or is it for use with the 600XL only? Wow, it'll be interesting to see if this works. The 1064 adds 48k to the 600XL's 16K to make it 64K. So if this does work then that would make the 800XL have 112K. Haha, didn't think of that... still... 112k Quote Link to comment Share on other sites More sharing options...
Bryan Posted April 7, 2005 Share Posted April 7, 2005 Will this expand the ram to 128k? or is it for use with the 600XL only? It only works on the 600XL. -Bry Quote Link to comment Share on other sites More sharing options...
Shawn Jefferson Posted April 7, 2005 Share Posted April 7, 2005 Doesn't the 1064 also turn off all the 600XLs built-in RAM and use its own 64k of RAM instead? If that is the case, and I think it is, then even if it did work in the 800XL, you are only going to get 64k anyhow. 1 Quote Link to comment Share on other sites More sharing options...
Clint Thompson Posted April 7, 2005 Author Share Posted April 7, 2005 If that was the case then it'd be great for a 800XL with bad memory (although what are the chances of ever seeing that?) Quote Link to comment Share on other sites More sharing options...
Gunstar Posted April 8, 2005 Share Posted April 8, 2005 Actually, I'm pretty sure that the 1064 will work with the 800xl, but it is useless becuase it would work on the 800xl just like on the 600xl and ignore the internal memory locations in favor of the 1064 memory, so you would still have a 64k XL either way. The 1064's memory locations are the same as the 800xl's internal memory for 100% compatiblity of the 600xl&1064 64k vs. 800xl 64k. But the 800xl would detect the 1064 installed just like the 600xl, basically making the 1064 think it's plugged into a 600xl (the 1064 wouldn't know the difference). Quote Link to comment Share on other sites More sharing options...
Bryan Posted April 8, 2005 Share Posted April 8, 2005 I read somewhere that the 600XL has power to the PBI to support the 1064, but that the 800XL does not (since PBI devices are supposed to be self-powered). -Bry 1 Quote Link to comment Share on other sites More sharing options...
+Mitch Posted April 8, 2005 Share Posted April 8, 2005 I read somewhere that the 600XL has power to the PBI to support the 1064, but that the 800XL does not (since PBI devices are supposed to be self-powered). -Bry I think you're right, pins 47 and 48 wasn't it? I suppose it would be pretty easy to add power on those pins to the 800XL though. Mitch Quote Link to comment Share on other sites More sharing options...
Curt Vendel Posted April 8, 2005 Share Posted April 8, 2005 Will this expand the ram to 128k? or is it for use with the 600XL only? Physically the 1064 can only work with the 600XL as it will block ports on the 800XL. While its called a 64K module, its actually only 48K of useable space and gives the 600XL 64K like the 800XL. There was a memory card designed for the unreleased Atari 1090 XL Expansion System that had 2 modes, one was 64K mode, the other was 1064 mode so one way worked for the 800/1400/1450 XL computers, and the 1064 mode for the 600XL, interesting thing about the 64XLMEM cards were that they had a header on them and you could daisy connect three together and add a total of 192K more onto a 800/1400/1450XL computer system... Curt 1 Quote Link to comment Share on other sites More sharing options...
+kheller2 Posted August 8, 2011 Share Posted August 8, 2011 Anyone have a picture of the inside of a 1064, and what chips were in it? Quote Link to comment Share on other sites More sharing options...
Alphasys Posted August 9, 2011 Share Posted August 9, 2011 (edited) Anyone have a picture of the inside of a 1064, and what chips were in it? 1064 uses the following chips: 8x 4164 (that makes 64k RAM, internal XL ram is disabled) 2x 74ALS157 (Line decoder/demultiplexer) 1x 74ALS245 (Line driver/latch) 1x 74ALS32 (OR gates x4) 1x 74LS04 (inverters, only 4 used out of 6) 1x 74ALS20 (AND gates, 3 of 4 used) Extra components: 13 resistors, 15 capacitors. Have the schematic, not a picture. Getting 64k into a 600XL only takes 2 new ram chips of the 4464 type and 3 wire bridges, so it's a waste of money, space and reliability. A connector is never as good as a soldered lead. More observations from the thread here: Curt is wrong. 1064 has 64k, and disables the 600XL's internal 16k. Brian and Mitch are right. Pin 47/48 are +5V on 600XL, reserved on 800XL. To answer Clint's original question: No. It'll just become a mess of which half is not used. There is no separate way to address the memory in the 1064 in a manner that's useful for a 800XL without a lot of modifications. It will not become a 130XE. Edited August 9, 2011 by Alphasys Quote Link to comment Share on other sites More sharing options...
firestorm Posted October 17, 2012 Share Posted October 17, 2012 ATARI 1064 with ATARI 800XL 1 Quote Link to comment Share on other sites More sharing options...
Tempest Posted October 17, 2012 Share Posted October 17, 2012 So what happens? Quote Link to comment Share on other sites More sharing options...
firestorm Posted October 17, 2012 Share Posted October 17, 2012 My ATARI 800XL is modded for RAM 320XL (5V on parallel bus) so this ATARI 1064 worked like external 64KB. Quote Link to comment Share on other sites More sharing options...
Bryan Posted October 17, 2012 Share Posted October 17, 2012 The most it could do is replace internal RAM with redundant external RAM. 1 Quote Link to comment Share on other sites More sharing options...
MEtalGuy66 Posted October 26, 2012 Share Posted October 26, 2012 As you can see in the pic, the 1064 does indeed have 8 64kx1 DRAM chips on it.. That's a full 64k. What it does is pull the EXRAM line low, which deactivates the internal ram in the machine and uses the ram on the 1064 instead. If you add the extra +5v circuit to the 800XL PBI bus, the 1064 will work on the 800XL, but you gain nothing. It's still 64k.. What you could do is wire up an external 5v PSU to the 1064, and use it to test XLs for bad ram.. If you plug that thing in, and it "fixes" the machine, then you know you most likely have a bad DRAM chip in the machine.. 3 Quote Link to comment Share on other sites More sharing options...
JohnBuell Posted October 26, 2012 Share Posted October 26, 2012 Now that's a damn good idea. Anybody still sitting on a pallet or two? Quote Link to comment Share on other sites More sharing options...
carmel_andrews Posted October 26, 2012 Share Posted October 26, 2012 I had one of those, never got around to using it, shame Atari never got around to going an 800xl version (i.e taking the xl's memory to 128k), if only i'd bought a yorkie (which was basically an 800xl version of the 1064 but with 256k memory and the later version included full XE compatibility) Quote Link to comment Share on other sites More sharing options...
Rybags Posted October 26, 2012 Share Posted October 26, 2012 You can't get full 130XE compatability (ie Antic banking) via PBI on an unmodified 800XL. Quote Link to comment Share on other sites More sharing options...
sup8pdct Posted October 27, 2012 Share Posted October 27, 2012 Curt is wrong. 1064 has 64k, and disables the 600XL's internal 16k. Brian and Mitch are right. Pin 47/48 are +5V on 600XL, reserved on 800XL. Curt is right. The first 16K is 600xl internal ram then the rest is on the 1064. The 600xl has an extra chip 74ls32 that does that. When 64K is added internally, the 32 can be removed and a jumper must be placed between pins 8 and 10 . Also the 1064 has the same chip that selects itself after the first 16K. Don't take my word for it, check out the schematics for the 1064 and 600XL @ jsobola.republika.pl/schematy.htm Also the 1064 doesn't appear to pull any control line low, not according to the schematic, so a 1064 on an 800xl will only suck power if the power lines are restored and mirror the internal ram after the first 16K. James 2 Quote Link to comment Share on other sites More sharing options...
MEtalGuy66 Posted October 27, 2012 Share Posted October 27, 2012 Yeah your right. I misspoke earlier.. extsel is active-high.. and it's asserted (in the 1064) by the state of a14 & a15.. so only accesses to the higher 48k will enable it. Quote Link to comment Share on other sites More sharing options...
+kheller2 Posted August 10, 2016 Share Posted August 10, 2016 (edited) Not to dig up an old and dead subject.. but why would atari put the extra 16K on the 1064 if it isn't going to be used? I'm not looking at the schematics at the moment, just trying to figure out why they would have a 74ls32 in the 600xl and one on the 1064 AND 8 RAM chips. Its probably some mapping thing I'm just not grasping. Edited August 10, 2016 by kheller2 Quote Link to comment Share on other sites More sharing options...
+David_P Posted August 10, 2016 Share Posted August 10, 2016 Probably easier to go with 64x1 x8 - that's 8 chips, instead of needing 16x1 x8x3, which would have been 24 chips and a more complex board. The official Atari 48K upgrade for the 400 also has 64x1 x8 chips - easier to build that way. Quote Link to comment Share on other sites More sharing options...
SS Posted June 17, 2018 Share Posted June 17, 2018 (edited) Bouncing up an old thread here ... Does anyone know what the original retail price of the 1064 module was? I am wondering what the price difference would have been in 1982/83 between an 800XL versus a 600XL with a separately purchased 1064? Edited June 17, 2018 by SS Quote Link to comment Share on other sites More sharing options...
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