+orpheuswaking Posted January 29, 2016 Share Posted January 29, 2016 (edited) I recently pulled apart a dead 800 in the hopes of resurrecting it. When I pulled the ROM card it has a piggy back board with three EPROMS. Sadly I was unable to fix the 800 itself (Swapped all chips with a donor and still nothing). I then slotted the ROM card in a working 800 and this came up There is a switch on the board but I get the same screen regardless of what side it is switched to. Does anyone have any idea of what it is/does? I can't locate anything online Edited January 29, 2016 by orpheuswaking Quote Link to comment Share on other sites More sharing options...
TXG/MNX Posted January 29, 2016 Share Posted January 29, 2016 Hmm does it boot DOS or only this output? Can post pictures of the board including the piggybank board front and back of the pcb. It also would nice if the eproms can be dumped. Sent from UMI hammer with Tapatalk Quote Link to comment Share on other sites More sharing options...
+orpheuswaking Posted January 29, 2016 Author Share Posted January 29, 2016 I'll grab some pictures this evening. It boots just to this screen. I don't have a way to dump the EPROMs unfortunately. Quote Link to comment Share on other sites More sharing options...
Kyle22 Posted January 29, 2016 Share Posted January 29, 2016 If it will boot DOS, try to save memory from $C000-$CFFF and from $D800 to $FFFF in two separate files. There are some OS dumping tools out there as well. Quote Link to comment Share on other sites More sharing options...
+orpheuswaking Posted February 1, 2016 Author Share Posted February 1, 2016 It will boot to DOS. Not sure how to dump it though, if someone can assist. here is the board When I removed the piggyback board I noticed that it sits in the left row of the socket for A401 and the right row of A403, the other rows are left empty. 1 Quote Link to comment Share on other sites More sharing options...
+orpheuswaking Posted February 1, 2016 Author Share Posted February 1, 2016 OS1.txt OS2.txt I managed to find a tool to dump the Eproms I took a dump with the switch on either side 1 Quote Link to comment Share on other sites More sharing options...
+Stephen Posted February 1, 2016 Share Posted February 1, 2016 Cool work. Now cover those windows! 2 Quote Link to comment Share on other sites More sharing options...
+orpheuswaking Posted February 1, 2016 Author Share Posted February 1, 2016 First thing I did before putting it away 1 Quote Link to comment Share on other sites More sharing options...
Kyle22 Posted February 1, 2016 Share Posted February 1, 2016 Those were text files with hex numbers in them. I wrote a small TurboBASIC program to convert them to binary. The files are attached. From a quick look at the dump, it looks like there's a ML monitor in there. Binary.zip Quote Link to comment Share on other sites More sharing options...
+orpheuswaking Posted February 1, 2016 Author Share Posted February 1, 2016 Sorry wasn't sure exactly what I was doing when I pulled the files. Not sure what I'm going to do with this board. Quote Link to comment Share on other sites More sharing options...
Kyle22 Posted February 1, 2016 Share Posted February 1, 2016 If it turns out to be something good, keep the board I wonder if it could be related to the XL Boss. http://www.cyberroach.com/analog/an25/xlboss.htm If we can get this into a good OS binary, then it may be useful for Incognito owners (like me). It may also be "just another custom OS" and not so useful. More research is required. Quote Link to comment Share on other sites More sharing options...
TXG/MNX Posted February 1, 2016 Share Posted February 1, 2016 Looks like a XLBOSS version for Atari 800, well the name also points to something like that. Would be interested indeed. It looks like the board replaces the ROMS in the Atari 800 so the Eproms do contain the original code and new code I guess then the switch would allow you to choose each mode atleast that what's I suspect seeing this picture cannot think of other use for the switch. Quote Link to comment Share on other sites More sharing options...
+orpheuswaking Posted February 1, 2016 Author Share Posted February 1, 2016 The only thing odd is that regardless of the switch orientation it still has the BOS+800 header. I'd be interested in knowing how it works. but ultimately I'd likely sell it on to someone who can get some use from it. Quote Link to comment Share on other sites More sharing options...
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