Icsmoke

I have a few, never used 2637N and they are signetics dated 7931 or maybe 30. Given to me straight from someone at philips. Never knew back then - mid-80s - how to use them without datasheet and only now I see these were used in this console

Just did the upgrade and now it works fine. So even the sdrive menu requires the extra ram. Anyway great result, thanks!

Yes that looks easy enough

Tried booting with option held, sdrive menu also does not work. So I guess I need to find some other software or some RAM Thanks for the help!

I have an atari 600xl without any mods or expansions. I build the sdrive-max, but cannot run anything successfully. All self tests pass; keys work, ram/rom ok and audio also works. Simple 10 print goto 10 also fine. I opened it up and the board looks in pretty good shape, caps look fine, no leaks. Pressed down on the chips to make sure they are seated well. Loading seems to work fine, but nothing runs. The sdrive.atr loads, shows black screen with a white row at the top, then blue screen with cursor after that it reboots by itself and repeats. Some other atr files from tosec (boulder dash, dos 2.5) give a garbled screen looking like random colored characters or just vertical lines with different colors. DOS first shows something that looks correct (blue screen and text in white) but then also some garbled output. So I could use some tips as I never used an atari before. I would at least expect the sdrive.atr (from v1.2 release) to work out of the box on the stock 16kb 600XL? Is that correct? Does this point to some hw issue, and if so what might be wrong? Or am I not using supported software, if so what would be a good demo to try for this machine?