sloopy Posted March 8, 2011 Share Posted March 8, 2011 The MMU would be a 20 pin chip labeled 'CO61618' probly on the left side (i am not as familiar with 65XE geography as i am with 800XL/130XE ;') sloopy. Quote Link to comment Share on other sites More sharing options...
BillC Posted March 8, 2011 Share Posted March 8, 2011 This upgrade board is designed to connect to a 16K OS socket, so a 1200XL would require the conversion to a single 16K OS chip instead of dual 8K. Many 1200XLs already have 28-pin OS sockets installed making this a fairly simple procedure. The 65XE would probably involve as much or more soldering than the 1200XL since the OS and MMU are probably not socketed. Other than cable connections to these sockets this upgrade only requires 3 additional connections to the main board. It is also easier to damage a 65XE board if inexperienced at soldering. Hi BillC, I opened up my 1200XL and 65XE tonight. The 1200XL is socketed, but has 24-pin sockets rather than 28-pin. On my 65XE, the U5 OS ROM is socketed. Oops, didn't check the MMU chip but I think it was socketed, too. So, most likely will go into the 65XE for me. Thanks for the assistance! [Edit] On the 65XE, where is the MMU relative to the OS ROM? I couldn't find any images that identify the MMU chip. Thanks again. I don't have a 65XE, but on my 130XE the MMU is about 1" left of the OS and is part #CO61618-20. Unfortunately this board is completely unsocketed. Quote Link to comment Share on other sites More sharing options...
candle Posted March 8, 2011 Author Share Posted March 8, 2011 it's C061618, not CO 65 and 130XE have MMU chips in the same place (starting from XEN board, and later XE board for 65/130), ealier models - without ECI port have it a bit lower, but thats all XEGS MMU is C101686 1200XL uses older version of MMU chip, than can be replaced by stock XL/XE MMU - do not worry, everything will be provided Quote Link to comment Share on other sites More sharing options...
BillC Posted March 8, 2011 Share Posted March 8, 2011 (edited) it's C061618, not CO 65 and 130XE have MMU chips in the same place (starting from XEN board, and later XE board for 65/130), ealier models - without ECI port have it a bit lower, but thats all XEGS MMU is C101686 1200XL uses older version of MMU chip, than can be replaced by stock XL/XE MMU - do not worry, everything will be provided I stand corrected, I used CO instead of C0 because that's what I've seen at Best Electronics and a lot of other sites. It's not always possible to tell the difference from the text on the IC. I notice that a lot of the Atari custom ICs listed at Best Electronics start with "CO". Edited March 8, 2011 by BillC Quote Link to comment Share on other sites More sharing options...
Rybags Posted March 8, 2011 Share Posted March 8, 2011 I always thought it was "CO"... in reference to "Colleen" the internal name for the 800. Quote Link to comment Share on other sites More sharing options...
candle Posted March 8, 2011 Author Share Posted March 8, 2011 if this would be so, we wouldn't have C1 then, wouldn't we? Quote Link to comment Share on other sites More sharing options...
Rybags Posted March 8, 2011 Share Posted March 8, 2011 Didn't the "1" usage come much later though? Quote Link to comment Share on other sites More sharing options...
+rdemming Posted March 8, 2011 Share Posted March 8, 2011 Did anyone try a graphic OS like Diamond GOS on this? Instead of SDX, you could in theory store Diamond OS on it. But it would need a rewrite to adapt it for the ROM banking-scheme of the Ultimate1MB board. Robert Quote Link to comment Share on other sites More sharing options...
Pilsner73 Posted April 14, 2011 Share Posted April 14, 2011 I have been speaking to Candle and he referred me back to you guys. I have an 800xl (all chips socketed) with a ICD RAmbo 256k upgrade installed (looks like a clean install btw). My questions pertain to the ultimate 1mb upgrade co existing with the Rambo 256k upgrade. Will there be issues with it? I don't mind if the Ultimate 1mb just overrides the 256k rambo and there are no issues at all but could there be issues with Shadowing of the memory and loops or other types? Quote Link to comment Share on other sites More sharing options...
Marius Posted April 14, 2011 Share Posted April 14, 2011 @Pilsner73 I have seen that question before, and I still don't understand why in the world someone would want to keep another memupgrade? First of all, most (if not all) older memory upgrades in Atari XL computers s*ck bigtime. They are very unreliable, especially when PBI devices, or multi-roms are installed. Next to that most modern (and bigger) memory upgrades do have several settings, so they also could act like a RAMBO 256KB memory expansion. I'm really interested in the reason why you want to keep it. It is really easy to downgrade your upgraded xl back to normal. You could keep using the RAM (41256) installed in your XL, they'll act like 64KB when you remove the ICD PCB and install the original parts (LS158, resistor) back on the orginal place in your atari. You won't need the 4164 DRAMS. Greetz M> Quote Link to comment Share on other sites More sharing options...
Pilsner73 Posted April 14, 2011 Share Posted April 14, 2011 @Pilsner73 I have seen that question before, and I still don't understand why in the world someone would want to keep another memupgrade? First of all, most (if not all) older memory upgrades in Atari XL computers s*ck bigtime. They are very unreliable, especially when PBI devices, or multi-roms are installed. Next to that most modern (and bigger) memory upgrades do have several settings, so they also could act like a RAMBO 256KB memory expansion. I'm really interested in the reason why you want to keep it. It is really easy to downgrade your upgraded xl back to normal. You could keep using the RAM (41256) installed in your XL, they'll act like 64KB when you remove the ICD PCB and install the original parts (LS158, resistor) back on the orginal place in your atari. You won't need the 4164 DRAMS. Greetz M> I bought the 800xl with the Rambo 256k already installed. I am only asking because it's in there already and I didn't do the upgrade and have no idea what was done to install it and if any parts have been changed or removed by the installer that may be needed to put back in the 800xl. You say install the ls158 and resistor back, where does one find these? Quote Link to comment Share on other sites More sharing options...
Marius Posted April 14, 2011 Share Posted April 14, 2011 I bought the 800xl with the Rambo 256k already installed. I am only asking because it's in there already and I didn't do the upgrade and have no idea what was done to install it and if any parts have been changed or removed by the installer that may be needed to put back in the 800xl. You say install the ls158 and resistor back, where does one find these? Ah. Yes. Probably are these parts also used on the Rambo Board itself. Are the IC's on socket on that RAMBO Board? Do you have an original XL (64KB)? If yes: you could look where the original parts belong, and how they are installed. It is probably rather easy to obtain a 33Ohm resistor, and a 74LS158 in a electronics store, or on ebay, or perhaps if you have a spare 600XL or something... Greetz M> Quote Link to comment Share on other sites More sharing options...
Pilsner73 Posted April 14, 2011 Share Posted April 14, 2011 (edited) I bought the 800xl with the Rambo 256k already installed. I am only asking because it's in there already and I didn't do the upgrade and have no idea what was done to install it and if any parts have been changed or removed by the installer that may be needed to put back in the 800xl. You say install the ls158 and resistor back, where does one find these? Ah. Yes. Probably are these parts also used on the Rambo Board itself. Are the IC's on socket on that RAMBO Board? Do you have an original XL (64KB)? If yes: you could look where the original parts belong, and how they are installed. It is probably rather easy to obtain a 33Ohm resistor, and a 74LS158 in a electronics store, or on ebay, or perhaps if you have a spare 600XL or something... Greetz M> Hmm I have a non functional 800xl that seems to be a different revision than my working 800xl. I have no idea what is wrong with the 800xl that isn't working and worried about swapping parts from it in case it's the issue. Now I could try swapping the PIA and 74ls158 from the bad machine as a test but like I said not sure if they are working. The next question of course what is the 330ohm for? Because I don't see it mentioned in the rambo manual for the 800xl install. Edited April 14, 2011 by Pilsner73 Quote Link to comment Share on other sites More sharing options...
+Guitarman Posted April 14, 2011 Share Posted April 14, 2011 Here is a link to my original post with the RamboXL Installation Guide in a PDF format. Just reverse the install in the manual. RamboXL Guide Quote Link to comment Share on other sites More sharing options...
Marius Posted April 14, 2011 Share Posted April 14, 2011 @Pilsner73 You can always try. As far as I know it is not 330 Ohm ... it is 33 Ohm. That is the resistor that is mounted just above the first ram. If that one is installed (on both connection points) just leave it there, but it is probably not there, or connected at one side. You can always swap components as long they are in socket. The chance that a defect IC will harm your working Atari is not that big. Ofcourse a bad component will make the working atari non-working as well ofcourse, but when you swap the component back, then you're done again. Greetz M Quote Link to comment Share on other sites More sharing options...
Pilsner73 Posted April 15, 2011 Share Posted April 15, 2011 (edited) @Pilsner73 You can always try. As far as I know it is not 330 Ohm ... it is 33 Ohm. That is the resistor that is mounted just above the first ram. If that one is installed (on both connection points) just leave it there, but it is probably not there, or connected at one side. You can always swap components as long they are in socket. The chance that a defect IC will harm your working Atari is not that big. Ofcourse a bad component will make the working atari non-working as well ofcourse, but when you swap the component back, then you're done again. Greetz M My mistake I looked at it real quick and typed 330 instead of 33ohm. As to why I asked about it, I don't see any mention of it in the icd rambo manual mentioned (at least the 800xl section). I might have time this weekend to take things apart and all. You are correct there is no need for the Rambo XL if I have Candles ultimate 1mb upgrade. My worry is I don't know how the Rambo was installed though it looks like the person followed the manual but it could turn into more work getting things back to stock than I'm capable of doing currently. Edited April 15, 2011 by Pilsner73 Quote Link to comment Share on other sites More sharing options...
Marius Posted April 15, 2011 Share Posted April 15, 2011 Probably when you remove the wires to the pia and put the pins back in the socket I think your atari is already close to original. But I am not sure... Quote Link to comment Share on other sites More sharing options...
candle Posted April 27, 2011 Author Share Posted April 27, 2011 ultimate1mb user manual Quote Link to comment Share on other sites More sharing options...
Van Posted April 27, 2011 Share Posted April 27, 2011 Yea, Thank you! Quote Link to comment Share on other sites More sharing options...
+orpheuswaking Posted April 28, 2011 Share Posted April 28, 2011 What the Heck, Candle wrote a user guide??? Quote Link to comment Share on other sites More sharing options...
Pilsner73 Posted May 13, 2011 Share Posted May 13, 2011 (edited) Look forward to seeing some installs of this device when it comes out. I finally solved the 800xl rambo issue I was having, I just bought a stock 800xl that cleaned up very well and all the chips are socketed and it's ready to be modified. Edited May 13, 2011 by Pilsner73 Quote Link to comment Share on other sites More sharing options...
candle Posted May 13, 2011 Author Share Posted May 13, 2011 i should have boards shipped from pcb house next week, and already have most of the components on shelf you can expect some pictures next week hopefully some panels partially assembled (still waiting for RAM chips and some connectors) Quote Link to comment Share on other sites More sharing options...
flashjazzcat Posted May 13, 2011 Share Posted May 13, 2011 Great. I have an 800XL prepped specially for one... Quote Link to comment Share on other sites More sharing options...
+Philsan Posted May 13, 2011 Share Posted May 13, 2011 So in the next weeks we'll have Ultimate1MB, IDE Plus 2.0 and SIC! cart. Too much things to learn... Quote Link to comment Share on other sites More sharing options...
flashjazzcat Posted May 13, 2011 Share Posted May 13, 2011 I'm having a reshuffle of upgrades: one 800XL is gonna have Ultimate 1MB, VBXE, IDE Plus 2.0 and stereo board. It's gonna rock! Quote Link to comment Share on other sites More sharing options...
Like us on Facebook
Follow us on Twitter
AtariAge on Instagram
Watch us on YouTube
Chat on Discord
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.