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Some new (not really) hardware made by tfhh

1050 Memory Expansion

105 replies to this topic

#101 AMenard OFFLINE  

AMenard

    Dragonstomper

  • 503 posts
  • Location:Beauharnois, Qc, Canada

Posted Thu Jun 7, 2018 7:04 PM

Hey,

Received my 512k ram upgrade today. Well, it's been sitting in the post office since 30/05 because the original delivery card never made it to me... I liked the packaging though I'm not sure what the aluminium foil wrapped block of foam is for :-)

In any case I should try to take the time this weekend to install it.

Thanks again!

#102 Nezgar OFFLINE  

Nezgar

    Dragonstomper

  • 757 posts
  • Location:Regina SK Canada

Posted Fri Jun 8, 2018 3:05 AM

Hmm, when there´s a trace damaged or broken the issues should happen immediately. When there´s bad RAM after 10-30 seconds, but the DRAM chips theirself work fine, any part of the DRAM timing circuit must be defect. Both address decoder 74LS158, the 74LS375 and 74LS51 would be the first parts I would keep an eye to it.

 

Happy to report after fighting with this problem for the last month, and being a little depressed about it (i see from the last post date ), i finally figured out the problem... leftover flux residue! Seems the Atari is sensitive enough to the tiny conductivity to make a difference. Cleaned that up thoroughly with IPA and MG Safety wash with qtip/toothbrush, and I've had the machine running demos reliably for a couple hours now. Phew!

 

I actually socketed the POKEY and installed the Stereo Upgrade from scratch on a 2nd stock 800XL too, and it worked for an hour or so before it started crapping out too. Then I thought that it might be the power supply, was outputting  5.2V under load maybe causing excess stress/heat on chips.. good that wasn't the issue...

 

Anyhow, both machines back to stock, all good now. Got as far as installing stereo upgrade again with just A4 and SR connected, Yoomp! and Bad Apple correctly detecting STEREO and listening to a few demos in 8 channel mono for now. this weekend I'll hopefully have more time to finish wiring the full stereo out!



#103 NISMOPC OFFLINE  

NISMOPC

    Moonsweeper

  • 322 posts
  • Location:OHIO

Posted Wed Jun 13, 2018 8:03 PM

UPDATE:

 

Removed RF Modulator, installed the 512K expansion board and the Best Electronics DIN composite kit on my 600XL.

 

Still testing it out, need to drill DIN out hole on case and re-assemble, but it all came together...

 

Thread on small issue with the video mod kit:

http://atariage.com/...tall/?p=4048469

 

0613182150.jpg



#104 Nezgar OFFLINE  

Nezgar

    Dragonstomper

  • 757 posts
  • Location:Regina SK Canada

Posted Fri Jun 15, 2018 9:48 AM

After power on, the 512 KB "RAMBO" mode is active. This mode should fit all your needs in 99% of all use cases. For some rare programs you can switch to 256 KB Compy-Shop mode (with seperated ANTIC and CPU access) or switch the whole expansion off. These setting remains active until you power off the computer, a coldstart without power cycling won´t change the setting anyway.


I just noticed this. How does one change the mode from the default 512KB "RAMBO" mode? Is there a utility program?



#105 tf_hh OFFLINE  

tf_hh

    Dragonstomper

  • Topic Starter
  • 618 posts
  • Location:Germany

Posted Fri Jun 15, 2018 11:24 AM

I just noticed this. How does one change the mode from the default 512KB "RAMBO" mode? Is there a utility program?

 

Yes. Must update the manual...

 

In the attached ATR file are three little binary files: MOFF.COM to disable memory expansion, M512 to enable 512 KB RAMBO mode (default) and M256 to enable 256 KB Compy-Shop mode (with seperated ANTIC amd CPU access like 130 XE).

Attached Files



#106 Nezgar OFFLINE  

Nezgar

    Dragonstomper

  • 757 posts
  • Location:Regina SK Canada

Posted Fri Jun 15, 2018 12:28 PM

Very nice, will try - thanks!

Love discovering new features I didn't know about before haha. Now maybe I don't need to pull out a stock 130XE machine to try the omniview 80 column AtariWriter that uses antic bank switching.

Edited by Nezgar, Fri Jun 15, 2018 12:36 PM.






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