+mizapf Posted November 9, 2020 Share Posted November 9, 2020 Is the optional 32k RAM also battery-backed? It is not really clear from the schematics. Quote Link to comment https://forums.atariage.com/topic/294844-hrd-4000b/page/9/#findComment-4672840 Share on other sites More sharing options...
RickyDean Posted November 9, 2020 Share Posted November 9, 2020 (edited) 8 minutes ago, mizapf said: Is the optional 32k RAM also battery-backed? It is not really clear from the schematics. If you mean the 32k ram for creating a stand alone card with the ti 32k memory card out of the peb box, then no it's not battery backed, as the contents would fluctuate with what ever cartridge was using it at the time. The 32k ram let's it become the expansion ram card for the ti. You would not use the 32k ram in the Geneve configuration. Edited November 9, 2020 by RickyDean additional content and correction. 3 Quote Link to comment https://forums.atariage.com/topic/294844-hrd-4000b/page/9/#findComment-4672845 Share on other sites More sharing options...
+jedimatt42 Posted November 9, 2020 Share Posted November 9, 2020 15 hours ago, mizapf said: Is the optional 32k RAM also battery-backed? It is not really clear from the schematics. I don't think you can choose to power part of a chip with SRAM, without powering all of the chip. 1 Quote Link to comment https://forums.atariage.com/topic/294844-hrd-4000b/page/9/#findComment-4673211 Share on other sites More sharing options...
+FALCOR4 Posted November 9, 2020 Share Posted November 9, 2020 15 hours ago, mizapf said: Is the optional 32k RAM also battery-backed? It is not really clear from the schematics. The optional 32K RAM, as RickyDean pointed out, is not battery-backed. All of the disk SRAMs and the 8K/32K DSR memory are battery-backed. 1 1 Quote Link to comment https://forums.atariage.com/topic/294844-hrd-4000b/page/9/#findComment-4673232 Share on other sites More sharing options...
NewcomerTI Posted July 22, 2021 Share Posted July 22, 2021 I would still like to purchase a bare board and a 8 M assembled card. Can you provide instructions on obtaining these? Quote Link to comment https://forums.atariage.com/topic/294844-hrd-4000b/page/9/#findComment-4868525 Share on other sites More sharing options...
RickyDean Posted July 22, 2021 Share Posted July 22, 2021 56 minutes ago, NewcomerTI said: I would still like to purchase a bare board and a 8 M assembled card. Can you provide instructions on obtaining these? You can private message @Ksarul, and he can probably help you. Quote Link to comment https://forums.atariage.com/topic/294844-hrd-4000b/page/9/#findComment-4868542 Share on other sites More sharing options...
+Ksarul Posted July 22, 2021 Author Share Posted July 22, 2021 I'll be testing the boards from my most recently assembled group this weekend, so yes, the boards are definitely still available. Quote Link to comment https://forums.atariage.com/topic/294844-hrd-4000b/page/9/#findComment-4868758 Share on other sites More sharing options...
Desaster Area Posted July 24, 2021 Share Posted July 24, 2021 On 7/22/2021 at 4:36 PM, Ksarul said: I'll be testing the boards from my most recently assembled group this weekend, so yes, the boards are definitely still available. Is this Board available in Germany? Quote Link to comment https://forums.atariage.com/topic/294844-hrd-4000b/page/9/#findComment-4869945 Share on other sites More sharing options...
+retroclouds Posted July 24, 2021 Share Posted July 24, 2021 2 hours ago, Desaster Area said: Is this Board available in Germany? It’s not available in Germany (at least not that I’m aware of). I’ve ordered all my boards directly with @Ksarul in the US. European Import taxes really is an annoyance though. The thing that bothers me the most is that you have to go pickup your parcel at the german Zoll, they open up the parcel and then they have no clue with what they are dealing with, and charge you import taxes on shipping costs as well. Go figure. We need an european seller for the many interesting boards available in the US ? Quote Link to comment https://forums.atariage.com/topic/294844-hrd-4000b/page/9/#findComment-4869980 Share on other sites More sharing options...
+mizapf Posted July 24, 2021 Share Posted July 24, 2021 When I picked up my Geneve at the customs (Zoll) back in 1990, they neither had any clue what it could be, just found a description "expansion card and keyboard" and categorized it as a musical instrument. 6 Quote Link to comment https://forums.atariage.com/topic/294844-hrd-4000b/page/9/#findComment-4870004 Share on other sites More sharing options...
+Ksarul Posted July 24, 2021 Author Share Posted July 24, 2021 10 hours ago, Desaster Area said: Is this Board available in Germany? I sell them directly to folks anywhere in the world. As noted, customs can be a problem. I also sell the bare boards with several of the seriously difficult-to-source parts included in the price for those who have the skills necessary to assemble them on their own (the bare boards are much less of a customs problem, as only the board, six diodes, and a pair of IC chips have a much lower value than a completed board). Note that this is not a kit--you would still have to purchase most of the components on your own to complete the board. 4 Quote Link to comment https://forums.atariage.com/topic/294844-hrd-4000b/page/9/#findComment-4870163 Share on other sites More sharing options...
AwkwardPotato Posted June 23, 2022 Share Posted June 23, 2022 Would it still be possible to purchase a bare 4000B board? Quote Link to comment https://forums.atariage.com/topic/294844-hrd-4000b/page/9/#findComment-5077766 Share on other sites More sharing options...
+Ksarul Posted June 23, 2022 Author Share Posted June 23, 2022 18 hours ago, AwkwardPotato said: Would it still be possible to purchase a bare 4000B board? Yes, I still have plenty of bare boards and the two difficult-to-find parts for them (included in the board price). The price has gone up a bit due to changes in postal rates and tax changes though ($35). 2 Quote Link to comment https://forums.atariage.com/topic/294844-hrd-4000b/page/9/#findComment-5078152 Share on other sites More sharing options...
DomLeBel1 Posted February 21, 2023 Share Posted February 21, 2023 Ksarul, i am interested in two bare board if you still have some. Thank You Dominique Quote Link to comment https://forums.atariage.com/topic/294844-hrd-4000b/page/9/#findComment-5213306 Share on other sites More sharing options...
+dhe Posted July 15, 2023 Share Posted July 15, 2023 Thanks @Ksarul for rebuilding the manual. I took some tentative steps towards replacing battery holders on my 4000, testing and then upgrading the memory, and discovered the copy of the 4000 manual on whtech is almost unreadable. I'm sure redoing the manual was a lot of labor. 3 Quote Link to comment https://forums.atariage.com/topic/294844-hrd-4000b/page/9/#findComment-5284642 Share on other sites More sharing options...
+Ksarul Posted July 16, 2023 Author Share Posted July 16, 2023 2 hours ago, dhe said: Thanks @Ksarul for rebuilding the manual. I took some tentative steps towards replacing battery holders on my 4000, testing and then upgrading the memory, and discovered the copy of the 4000 manual on whtech is almost unreadable. I'm sure redoing the manual was a lot of labor. Do note, there are a lot of differences between the 4000 and the 4000B, as @FALCOR4 and I made a lot of operational improvements to the board to increase reliability. Some of those changes are in the battery area of the board. . . 2 Quote Link to comment https://forums.atariage.com/topic/294844-hrd-4000b/page/9/#findComment-5284682 Share on other sites More sharing options...
NewcomerTI Posted September 8, 2023 Share Posted September 8, 2023 I’m starting to populate my bare board project. First I’m soldering in the sockets and I’ll be moving on to soldering in the capacitors. Are the 512K memory chips still available? I’m having trouble sourcing these 16 chips along with the 40 pin in line header. Can anyone provide a source for them? Quote Link to comment https://forums.atariage.com/topic/294844-hrd-4000b/page/9/#findComment-5311892 Share on other sites More sharing options...
+retroclouds Posted September 8, 2023 Share Posted September 8, 2023 To anyone who does not have a HRD4000B, if you haven’t one try to get one. For me it is the most valuable of all PEB cards I have. It’s incredibly stable (thanks @Ksarul) and it has so many features that I even’t have touched on. 7 Quote Link to comment https://forums.atariage.com/topic/294844-hrd-4000b/page/9/#findComment-5311940 Share on other sites More sharing options...
+Ksarul Posted September 8, 2023 Author Share Posted September 8, 2023 14 hours ago, NewcomerTI said: I’m starting to populate my bare board project. First I’m soldering in the sockets and I’ll be moving on to soldering in the capacitors. Are the 512K memory chips still available? I’m having trouble sourcing these 16 chips along with the 40 pin in line header. Can anyone provide a source for them? I bought the pin headers off of eBay for my builds. Quite a few sellers sell them from single pieces to 400 in a bag (I usually buy the bags, just because of how many I use). Both Mouser and DigiKey have the 512K chips. This Link goes to the DigiKey part from Alliance. 1 Quote Link to comment https://forums.atariage.com/topic/294844-hrd-4000b/page/9/#findComment-5312526 Share on other sites More sharing options...
NewcomerTI Posted September 8, 2023 Share Posted September 8, 2023 Thanks for the information and link. I just ordered the memory. I’ll look into the 40 pin header for the project. Your response is appreciated. I hope to have this card up and running correctly to install it soon. Thanks again! Quote Link to comment https://forums.atariage.com/topic/294844-hrd-4000b/page/9/#findComment-5312550 Share on other sites More sharing options...
+InsaneMultitasker Posted September 10, 2023 Share Posted September 10, 2023 On 9/7/2023 at 11:54 PM, retroclouds said: It’s incredibly stable (thanks @Ksarul) and it has so many features that I even’t have touched on. 100% agree on the stability factor. 2 Quote Link to comment https://forums.atariage.com/topic/294844-hrd-4000b/page/9/#findComment-5313503 Share on other sites More sharing options...
+Ksarul Posted September 10, 2023 Author Share Posted September 10, 2023 On 9/8/2023 at 12:54 AM, retroclouds said: To anyone who does not have a HRD4000B, if you haven’t one try to get one. For me it is the most valuable of all PEB cards I have. It’s incredibly stable (thanks @Ksarul) and it has so many features that I even’t have touched on. On the stability of this one, two others are just as important as I was in the project development: @FALCOR4 did some serious stress-testing and suggested hardware changes that turned a solid design into a rock-solid one, and @InsaneMultitasker, who worked in tandem with us to bullet-proof ROS. All the testing found some interesting bugs that had been lurking in the deep, dark depths of the ROS code, some since its earliest iterations. The HRD4000B would be a lesser product without the dedicated work both of these guys put into the project. 9 Quote Link to comment https://forums.atariage.com/topic/294844-hrd-4000b/page/9/#findComment-5313749 Share on other sites More sharing options...
apersson850 Posted September 11, 2023 Share Posted September 11, 2023 14 hours ago, Ksarul said: ...and @InsaneMultitasker, who worked in tandem with us to bullet-proof ROS. All the testing found some interesting bugs that had been lurking in the deep, dark depths of the ROS code, some since its earliest iterations. Was anything done to mitigate the incompatibility with the p-system? Although I made my own "ROS stub" to make it compatible, it would have been nice if the standard one would work too, since my verison only supports the p-system. 1 Quote Link to comment https://forums.atariage.com/topic/294844-hrd-4000b/page/9/#findComment-5314327 Share on other sites More sharing options...
+InsaneMultitasker Posted September 11, 2023 Share Posted September 11, 2023 5 hours ago, apersson850 said: Was anything done to mitigate the incompatibility with the p-system? Although I made my own "ROS stub" to make it compatible, it would have been nice if the standard one would work too, since my verison only supports the p-system. When I looked at the issue long ago, there wasn't sufficient space to do anything about the problem. Since then, some code has been moved around and although I don't know if it is possible to correct, we can certainly revisit. As I recall, you wrote up some good information about this n the past. If you know where to find that information and / or could submit the details as an issue in the ramdisk github repository, that would be very helpful. Here is a link to the issue tracker: https://github.com/horizonramdisk/Horizon-Ramdisk-ti994a/issues 3 Quote Link to comment https://forums.atariage.com/topic/294844-hrd-4000b/page/9/#findComment-5314434 Share on other sites More sharing options...
apersson850 Posted September 11, 2023 Share Posted September 11, 2023 (edited) 6 hours ago, InsaneMultitasker said: When I looked at the issue long ago, there wasn't sufficient space to do anything about the problem. That I could very much believe in. Do you want me to look up the small DSR I wrote, that is compatible with the p-system? Or some verbal description? Both, maybe? Here's a link to a post where I described what the issue is. Edited September 11, 2023 by apersson850 Quote Link to comment https://forums.atariage.com/topic/294844-hrd-4000b/page/9/#findComment-5314751 Share on other sites More sharing options...
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