+slx Posted April 9, 2018 Share Posted April 9, 2018 Taking apart my new Indus GT for repairs I found two empty spaces for IC sockets U7 on the top board an U7 on the main board. Any idea what they might have been designed for? Quote Link to comment Share on other sites More sharing options...
1050 Posted April 11, 2018 Share Posted April 11, 2018 According to these. Indus schem.zip There are no twin U7s but one of them was for a 7416 hex inverter buffer/driver with open-collector high-voltage outputs One schematic does show a stepper motor buffer that appears to have been optional, perhaps this is the second open spot? Don't have one so don't know a top board from a main board. Can you sift thru these and inform us of which schematic is for which board so I can write that info into the file name for the next guy? TIA. 1 Quote Link to comment Share on other sites More sharing options...
BillC Posted April 11, 2018 Share Posted April 11, 2018 (edited) According to these. Indus schem.zip There are no twin U7s but one of them was for a 7416 hex inverter buffer/driver with open-collector high-voltage outputs One schematic does show a stepper motor buffer that appears to have been optional, perhaps this is the second open spot? Don't have one so don't know a top board from a main board. Can you sift thru these and inform us of which schematic is for which board so I can write that info into the file name for the next guy? TIA. 04-0030-00 and 04-0030-004 appear to be sheets 1 and 2 of the WART(bottom PCB) schematic respectively. Sheet 2 shows U2 as a WD1770 and U7 as a WD2797, only 1 of which would be populated. The 04-0110-X10 schematic is of the Analog(top) PCB. Edited April 11, 2018 by BillC Quote Link to comment Share on other sites More sharing options...
1050 Posted April 11, 2018 Share Posted April 11, 2018 Thanks BillC, I never even noticed that there could be either FDC chip installed here. So that might be one missing U7 if he has a 2797 instead. The other then is on 04-0110-X10 top board shown as distributed logic gates of the 7416 hex inverter also called U7. Now wondering what WART is short for as this slowly makes more sense. Always wanted one of these and never ran across one. 1 Quote Link to comment Share on other sites More sharing options...
sup8pdct Posted April 11, 2018 Share Posted April 11, 2018 WART = Weird Atari Rotating Thing. No GT was shipped with a wd1770 tho the firmware may support it. I dissembled it but thought a command was wrong for the wd1770. James 1 Quote Link to comment Share on other sites More sharing options...
BillC Posted April 11, 2018 Share Posted April 11, 2018 WART = Weird Atari Rotating Thing. No GT was shipped with a wd1770 tho the firmware may support it. I dissembled it but thought a command was wrong for the wd1770. James It could be that they designed the PCB to be able to use either FDC in case WD2797 became unavailable or too expensive, but never needed to use the feature. I would think different firmware would be needed with the WD1770. Quote Link to comment Share on other sites More sharing options...
Kyle22 Posted April 12, 2018 Share Posted April 12, 2018 WART = Weird Atari Rotating Thing. No GT was shipped with a wd1770 tho the firmware may support it. I dissembled it but thought a command was wrong for the wd1770. James Wonderful Atari Rotating Thing. Quote Link to comment Share on other sites More sharing options...
+slx Posted April 12, 2018 Author Share Posted April 12, 2018 Will have a look though reading schematics and mapping them to the real world is not something I do with ease. Quote Link to comment Share on other sites More sharing options...
sup8pdct Posted April 13, 2018 Share Posted April 13, 2018 Checkout http://atariage.com/forums/topic/129969-indus-gt-rom-disassembly/ @ location 33 are the commands for FDC1770 @ c37 are commands for FDC2797. The firmware supports both but i am not sure the commands for 1770 are fully correct. James Quote Link to comment Share on other sites More sharing options...
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