cbelcher Posted January 22, 2018 Share Posted January 22, 2018 I dusted off my old 1040 STF - TOS 1.0 and was hoping to upgrade to 6 chip TOS 1.4 to do so some work with ASCI projects. TOS images have been easy to find ( http://www.avtandil.narod.ru/tose.html), and I have split them using various programs in the emulators - but I can't get an upgraded rom to boot - it always bombs out with 8 or more. Funny thing is I can boot to TOS 1.0 on a 27c512 with the dual boot modification ( http://atari4ever.free.fr/hardware/zip/dual_tos.zip), but when I switch to 1.04 (before booting) it bombs out. Also burning a split set of 1.4 roms to 27c256 and being careful about their sockets - I still bomb out on boot. The ROMs verify on the burner and apparently I can do well with TOS1.0... Any ideas? Anyone have a good 6 chip set of ROMs or some advice? Thanks! Quote Link to comment Share on other sites More sharing options...
ParanoidLittleMan Posted January 22, 2018 Share Posted January 22, 2018 Bad image and/or bad splitting SW. Can you post here 6 images which you burnt into EPROMs ? (ZIPped) . Just to check them. 1 Quote Link to comment Share on other sites More sharing options...
cbelcher Posted January 23, 2018 Author Share Posted January 23, 2018 This is the original "hack" mentioned above - with the combined 1.0/1.4 (to be burned into a 27c512)- I can only get the 1.0 to boot when selected, the 1.4 bombs And the 1.4 that I split from a web image on the emulators (to be burned into a 27c256) - it bombs thanks! dual_tos (1).zip TOS 104 split.zip Quote Link to comment Share on other sites More sharing options...
ParanoidLittleMan Posted January 23, 2018 Share Posted January 23, 2018 I checked - it is US 1.04, and splitting is OK. All I can now think is that problem is because age of computer, and it works not 100% reliable. Some SW passes, some not. Recommending for start to go into replacing of electrolyte capacitors in PSU - that's very typical problem. Especially if machine was not powered on for many years. Quote Link to comment Share on other sites More sharing options...
cbelcher Posted January 23, 2018 Author Share Posted January 23, 2018 Thank you for checking. It's an old US 1040STF - rev C motherboard. Will replace the caps and see - very strange. I even verified the ROM chips I burnt vs the files and they checked out... Quote Link to comment Share on other sites More sharing options...
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