hunter44102 Posted May 8, 2017 Share Posted May 8, 2017 I have a 130XE that boots to memory test and has bad memory. Since it is all soldered ram I was trying to avoid all the extra desoldering. If I install the 1MB ultimate will the machine work? Will it bypass the stock memory since the 1mb ultimate uses its own memory? Quote Link to comment Share on other sites More sharing options...
TheMontezuma Posted May 8, 2017 Share Posted May 8, 2017 U1MB assumes 64kB on-board working memory... Quote Link to comment Share on other sites More sharing options...
Rybags Posted May 8, 2017 Share Posted May 8, 2017 The 320XL, not sure about Simius' other Ram plugin upgrades, has the option to override internal Ram (jumper setting). Supposedly some types of Ram failure though can cause spurious output which would interfere with normal system operation. 1 Quote Link to comment Share on other sites More sharing options...
Marius Posted May 8, 2017 Share Posted May 8, 2017 Since the 130XE has two banks of 64K each you could criss-cross 2 resistors on the PCB so the 'extended' ram will be the base ram and the base ram will be the extended ram. I have to look up somewhere which resistors you have to criss-cross. Installing the U1MB ram will disable the extended RAM. If the issues with RAM only occur in the currently extended RAM you could bypass the problems this way. The chance though that more ram chips are unstable exists. Quote Link to comment Share on other sites More sharing options...
hunter44102 Posted May 8, 2017 Author Share Posted May 8, 2017 Since the 130XE has two banks of 64K each you could criss-cross 2 resistors on the PCB so the 'extended' ram will be the base ram and the base ram will be the extended ram. I have to look up somewhere which resistors you have to criss-cross. Installing the U1MB ram will disable the extended RAM. If the issues with RAM only occur in the currently extended RAM you could bypass the problems this way. The chance though that more ram chips are unstable exists. This sounds like it's worth trying either way... Would love to see which lines to jump Quote Link to comment Share on other sites More sharing options...
Marius Posted May 8, 2017 Share Posted May 8, 2017 (edited) This sounds like it's worth trying either way... Would love to see which lines to jump Ok look for a chip with the number: CO25953 on it. Above that chip you'll find two resistors. Desolder one side of each (same side, let's say the left side) Now cross them. So the left side of the 1st resistor is soldered to left connection point on the pcb where the 2nd resistor's left leg was soldered to. And solder the left leg of the 2nd resistor to connection point on the pcb where the 1st resistors' left leg was soldered to. Make sure you do not shortcircuit anything and all this is at your own risk! Edited May 8, 2017 by ProWizard 1 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.