barry.peterson Posted July 14, 2017 Share Posted July 14, 2017 I have a couple of bare HDX boards but no idea of the components needed and this doofus can't find a parts list. Can some kind soul point me in the right direction or just give me a parts list? Two transistors, one battery holder, 3 diodes, 5 resistors, a chip (6264 or 62256 or?) Quote Link to comment Share on other sites More sharing options...
+Ksarul Posted July 15, 2017 Share Posted July 15, 2017 Here's the link. Go down towards the bottom of the page for the BOM and assembly instructions. 1 Quote Link to comment Share on other sites More sharing options...
Shift838 Posted July 15, 2017 Share Posted July 15, 2017 I have a couple of bare HDX boards but no idea of the components needed and this doofus can't find a parts list. Can some kind soul point me in the right direction or just give me a parts list? Two transistors, one battery holder, 3 diodes, 5 resistors, a chip (6264 or 62256 or?) Fred has it in his projects page for the HDX and all it's parts. This is the updated link below: HERE Quote Link to comment Share on other sites More sharing options...
barry.peterson Posted July 15, 2017 Author Share Posted July 15, 2017 Here's the link. Go down towards the bottom of the page for the BOM and assembly instructions. That link is broken but the next one works. Quote Link to comment Share on other sites More sharing options...
barry.peterson Posted July 15, 2017 Author Share Posted July 15, 2017 Fred has it in his projects page for the HDX and all it's parts. This is the updated link below: HERE Thanks, I've been there several times but assumed it was a software download link. It looks doable. Quote Link to comment Share on other sites More sharing options...
barry.peterson Posted July 15, 2017 Author Share Posted July 15, 2017 Next silly question; there are two 10K resistors, R5 & R6 but my board has no R6. Is there something I'm missing? Quote Link to comment Share on other sites More sharing options...
RickyDean Posted July 15, 2017 Share Posted July 15, 2017 Next silly question; there are two 10K resistors, R5 & R6 but my board has no R6. Is there something I'm missing? No, your not missing something, I have been meaning to ask about this resistor too as I have almost completed my HDX, but I had to place it on the back-burner, as I have had other things going on. Thanks for reminding me, and I too need an answer to this same question. Quote Link to comment Share on other sites More sharing options...
+arcadeshopper Posted July 16, 2017 Share Posted July 16, 2017 he just never updated the docs after removing the resistor from the design.. it doesn't exist don't buy two 10k resistors just one.. Greg Quote Link to comment Share on other sites More sharing options...
F.G. Kaal Posted July 16, 2017 Share Posted July 16, 2017 See comments in schematic: http://www.ti99-geek.nl/Projects/ti99hdx/Files/ti99_rs232_dsr_ram.gif R6 is a pullup resistor for gate U6 for disabeling interrupts. Fred Quote Link to comment Share on other sites More sharing options...
+arcadeshopper Posted July 16, 2017 Share Posted July 16, 2017 See comments in schematic: http://www.ti99-geek.nl/Projects/ti99hdx/Files/ti99_rs232_dsr_ram.gif R6 is a pullup resistor for gate U6 for disabeling interrupts. Fred It isn't in the board designs we have been using all this time though.. It just has r5 and no location for r6.. none of the bazillions i've built has a R6 Greg Quote Link to comment Share on other sites More sharing options...
F.G. Kaal Posted July 17, 2017 Share Posted July 17, 2017 (edited) It isn't in the board designs we have been using all this time though.. It just has r5 and no location for r6.. none of the bazillions i've built has a R6 Greg You're right Greg, It is only mentioned in the schematic and bill of materials and step 30 only mentions the switch. SW1 and R6 are optional and R6 must be added on the RS232 card itself. You only need these if for some reason you need the interrupts of RS232/1 and using some program that enables the interrupts like Telco. I can live without the interrupts for years now ... I have never used Telco again after HDX worked flawless . I only added SW1 and R6 on my second RS232 card for my Geneve system and I see now that is not the one in the photo on my website ... oh well ... better add a second photo some day. Fred Edited July 17, 2017 by F.G. Kaal Quote Link to comment Share on other sites More sharing options...
+arcadeshopper Posted July 17, 2017 Share Posted July 17, 2017 I've added the switch to reconnect the cut trace which works fine so far without any resistor Sent from my LG-H830 using Tapatalk Quote Link to comment Share on other sites More sharing options...
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